DQR ID | Subject | Data Streams Affected |
---|---|---|
D000606.1 | SGP/MWR/C1 - IRT removed | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D000717.1 | TWP/MWR/C1 - Rain on window | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D001122.1 | SGP/MWR/C1 - calibration checks | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D001205.1 | SGP/MWR/C1 - Time drift | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D010201.1 | NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.2 | NSA/MWR/C1 - negative sky brightness temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.3 | NSA/MWR/C1 - negative sky brightness temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.5 | NSA/MWR/C1 - Reprocess: calibration change | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D010202.6 | NSA/MWR/C1 - incorrect flagging of data | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D010202.7 | NSA/MWR/C1 - incorrect flagging of data | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D010215.5 | SGP/MWR/C1 - IRT failure | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D010216.2 | NSA/MWR/C1 - NSA Barrow MWR down due to PC Virus | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrtipC1.b1 |
D010504.4 | NSA/MWR/C1 - Reprocess: calibration change | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D020122.1 | NSA/MWR/C1 - Reprocess: wrong calibration | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.28 | NSA/MWR/C1 - Contamination or Calibration Effect | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.29 | NSA/MWR/C1 - Frosting | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.30 | NSA/MWR/C1 - Instrument maintenance | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.32 | NSA/MWR/C1 - MWR moved | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.33 | NSA/MWR/C1 - negative PWV (bad calibration?) | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.34 | NSA/MWR/C1 - Heater/blower removed | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020823.36 | NSA/MWR/C1 - Data spikes, possibly due to cleaning events | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D020905.3 | SGP/MWR/C1 - Reprocess: IRT insufficiently insulated | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D021017.1 | NSA/MWR/C1 - MWR digital board failure | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D030214.1 | SGP/MWR/B4/C1 - LOS cycle skipping | sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D030312.10 | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D030312.6 | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D030312.9 | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | twpmwrlosC1.b1 |
D030515.3 | NSA/MWR/C1 - no air temperature signal | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D030822.1 | SGP/MWR/C1 - Incorrect min and max values | sgpmwrlosC1.b1 |
D030822.7 | NSA/MWR/C1 - min/max/delta values incorrect | nsamwrlosC1.b1 |
D030902.1 | SGP/MWR/C1 - no air temperature signal | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D040116.1 | NSA/MWR/C1 - damaged window | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
D040220.1 | TWP/MWR/C1 - wrong azimuth | twpmwrlosC1.b1 |
D040225.5 | NSA/MWR/C1 - power supply failure | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D040824.1 | SGP/MWR/C1 - Wet window flag "on" more frequently than expected | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D041001.3 | SGP/MWR/C1 - Instrument problem | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D041014.1 | SGP/MWR/C1 - thermal instability | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D041117.2 | SGP/MWR/C1 - Reprocess: wrong retrievals | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
D050112.1 | NSA/C1 - Site-wide power failure | nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrpC1.b1, nsamwrtipC1.a1, nsatwrcam40mC1.a1, nsavceil25kC1.b1 |
D050203.1 | NSA/MWR/C1 - poor air temperature values | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050203.3 | SGP/MWR/C1 - spare instrument | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D050617.1 | PYE/MWR/M1 - Instrument computer locked up | pyemwrlosM1.b1 |
D050722.1 | SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
D050725.12 | PYE/MWR/M1 - Reprocessed: Revised Retrieval Coefficients | pyemwrlosM1.b1, pyemwrtipM1.a1 |
D050725.7 | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
D050725.9 | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1 |
D050726.4 | PYE/MWR/M1 - Reprocessed: Calibration corrected | pyemwrlosM1.b1, pyemwrtipM1.a1 |
D050809.2 | NSA/MWR/C1 - Possible loss of accuracy due to missing blower | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050915.1 | SGP/MWR/C1 - Instrument noise problem | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D050919.5 | NSA/MWR/C1 - Missing Data | nsa5mwravgC1.c1, nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050920.2 | NSA/MWR/C1 - Instrument problem, Heater problem | nsamwrC1.00, nsamwrlosC1.b1 |
D050927.1 | PYE/MWR/M1 - New software version (4.15) installed | pyemwrlosM1.b1, pyemwrtipM1.a1 |
D050928.1 | TWP/MWR/C1 - New software version (4.15) installed | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D050928.3 | NSA/MWR/C1 - New software version (4.15) installed | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D050930.1 | NSA/MWR/C1 - Reprocess: wrong calibration | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D051011.6 | SGP/MWR/C1 - New software version (4.15) installed | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D051020.1 | NSA/MWR/C1 - Incorrect time stamp | nsamwrC1.00, nsamwrlosC1.b1 |
D060419.4 | NIM/MWR/M1 - Instrument noise problem/RF interference | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060420.6 | TWP/MWR/C1 - Software Change | twpmwrlosC1.b1 |
D060420.8 | NSA/MWR/C1 - software upgrade (version 3.28) | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D060420.9 | TWP/MWR/C1 - software upgrade (version 3.29) | twpmwrlosC1.b1 |
D060717.2 | SGP/MWR/C1 - Spikes in ambient temperature readings | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D060717.4 | NSA/MWR/C1 - TKAIR sensor failure | nsamwrlosC1.b1 |
D060718.1 | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. | nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060927.1 | NIM/MWR/M1 - Sun in field of view of radiometer | nimmwrlosM1.b1 |
D061114.1 | NSA/MWR/C1 - Rain sensor always on | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D061114.2 | TWP/MWR/C1 - Radiometer failure | twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1 |
D070105.1 | TWP/MWR/C1 - Missing data | twpmwrlosC1.b1 |
D070314.2 | SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag | sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1 |
D070412.3 | TWP/MWR/C1/C2 - Sun in the field of view | twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1 |
D070613.1 | TWP/MWR/C1 - Intermittent data | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D070802.3 | SGP/MWR/C1 - Noisy data | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D071128.2 | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D071208.1 | TWP/MWR/C1 - Incorrect ambient temperature readings | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D080103.2 | SGP/MWR/C1 - Missing data | sgpmwrlosC1.b1 |
D080512.1 | NSA/MWR/C1 - Spikes in air temperature readings | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D080623.1 | NSA/MWR/C1 - Missing surface air temperature data | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D081013.2 | TWP/MWR/C1 - Short periods of wrong ambient temperature | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D081013.5 | SGP/MWR/C1 - Increased noise in 31.4 GHz channel | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D090114.2 | NSA/MWR/C1 - Incorrect brightness temperatures and retrievals | nsa5mwravgC1.c1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D090114.4 | TWP/MWR/C1 - Ambient temperature data missing | twpmwrlosC1.b1, twpmwrtipC1.a1 |
D090417.1 | NSA/MWR/C1 - RFI screening test | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D090417.5 | NSA/MWR/C1 - High noise in 23.8-GHz channel | nsamwrlosC1.b1, nsamwrtipC1.a1 |
D090522.1 | GRW/MWR/M1 - Loose mirror | grwmwrlosM1.b1, grwmwrtipM1.a1 |
D940820.1 | SGP/MWR/C1 - IRT rain lid removal | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D950110.2 | SGP/MWR/C1 - Data dropouts due to serial comm problems | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D950501.2 | SGP/MWR/C1 - IR thermometer calibration check | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D960405.1 | SGP/MWR/C1 - Loss of thermal stabilization | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D960422.1 | SGP/MWR/C1 - Radio Frequency Interference during IOP | sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D961114.1 | SGP/MWR/C1 - IRT lens replaced | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D961120.1 | SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustment | sgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1, sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D961220.1 | SGP/MWR/C1 - IRT Calibration check | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D970509.1 | SGP/MWR/C1 - IRT Calibration | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D980130.1 | SGP/MWR/C1 - IRT offline | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D980507.1 | SGP/MWR/C1 - IRT lens replaced | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
D981204.1 | SGP/MWR/C1 - Erroneous internal temperature | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D990106.1 | SGP/MWR/B1/B4/B6/C1 - software change | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0 |
D990106.3 | NSA/MWR/C1 - Software Change | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
D990113.1 | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
D990114.1 | NSA/MWR/C1 - Spikes in PWV data | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D990114.2 | NSA/MWR/C1 - Spikes in PWV data | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D990114.3 | NSA/MWR/C1 - Reprocess: incorrect calibrations | nsamwrlosC1.00, nsamwrlosC1.a1, nsamwrlosC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/19/1999 | 2230 | 11/17/1999 | 2025 |
Subject: | SGP/MWR/C1 - IRT removed |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | There were no IRT data during this period because MWR #10, upon which the IRT is mounted, was returned to the vendor for upgrades and replaced with spare MWR #33 which does not have the mounting hardware or the electronics to accept the IRT. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/25/1997 | 0000 | 11/13/1997 | 0000 |
12/01/1997 | 0000 | 01/13/1998 | 0000 |
04/01/1998 | 0000 | 03/31/1999 | 0000 |
Subject: | TWP/MWR/C1 - Rain on window |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The data is subject to contamination due to rain on the sensor window and should be used with caution because the heater/blower assembly that prevents water from accumulating on the sensor's teflon window was out of commission. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/16/2000 | 2210 | 02/16/2000 | 2250 |
09/21/2000 | 1423 | 09/21/2000 | 1434 |
09/21/2000 | 1506 | 09/21/2000 | 1517 |
09/26/2000 | 1426 | 09/26/2000 | 1434 |
10/02/2000 | 1732 | 10/02/2000 | 1752 |
10/02/2000 | 2052 | 10/02/2000 | 2107 |
10/03/2000 | 1406 | 10/03/2000 | 1421 |
09/06/2001 | 1900 | 09/06/2001 | 2000 |
Subject: | SGP/MWR/C1 - calibration checks |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The MWR calibration was checked by a cryogenic (liquid nitrogen) blackbody target or (in the case of the Sept 2001 time period) by pointing the mirror at an internal blackbody target. The brightness temperatures and vap and liq retrievals are not representative of the sky/atmosphere. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/05/2000 | 1955 | 09/18/2000 | 2145 |
Subject: | SGP/MWR/C1 - Time drift |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | On 9/18/00, I found that the time on the MWR laptop was 1m 21s slow. The Dimension4 utility had last synchronized the time on 5/5/00. Found that the network DNS settings had been disabled. Added the DNS entry for ntp host CF10. Dimension4 synchronized the clock by adding 80.91s. The time had drifted at a rate of -0.59s/day. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/17/2001 | 0600 | 01/22/2001 | 2145 |
Subject: | NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired |
DataStreams: | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | On 1/17 we had a big spike in the data and lost temperature stabilization. The instrument had problems maintaining the Noise Diode (ND) temperature since. At ambient temperatures under about -20 C the ND was not maintaining the set temperature of 30 C. This problem was reported in P010122.1. Fred Solheim recommended on 1/22 that we powercycle the instrument as it looked like the instrument CPU had lost the temperature reference. So we powercycled the instrument on 1/22 @ 20:30 and lost all comumnication to it; after a second powercycling the instrument came back on line and the temperature stabilized quickly (within a couple of minutes) to the set temperature (30 C) Fred Solheim reported after the system was restored: "I've never seen this behavior before. I don't think it was due to the RF deck physically hanging temperature, because the recorded temp dropped about 30 C in one observation cycle. If this happens again, send the MWR down along with data files for us to look at." Data collected in the periode 1/17/2001 6:00 to 1/22/2001 21:45 are questionable since it is uncertain whether the temperature really was unstable and what really caused the problem. |
Measurements: | nsamwrlosC1.a1:
nsa5mwravgC1.c1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/03/2000 | 0000 | 05/24/2000 | 1800 |
Subject: | NSA/MWR/C1 - negative sky brightness temperatures |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The data exhibit occasional negative sky brightness temperatures. The problem was corrected when the site operator cleaned the cable connectors and coated the terminals with dielectric grease. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/10/2000 | 0000 | 12/21/2000 | 2359 |
Subject: | NSA/MWR/C1 - negative sky brightness temperatures |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The data exhibit occasional negative sky brightness temperatures. The problem was corrected when the computer was reconfigured following a virus infection. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/22/2000 | 2330 | 11/24/2000 | 1400 |
Subject: | NSA/MWR/C1 - Reprocess: calibration change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The thicker (1/2-inch) insulation was installed on the RF deck and the reference temperature was reduced from 50 C to 30 C to prevent thermal instability in winter. A change in the mixer temperature affects the instrument's calibration. A new calibration was automatically derived and applied after 1500 valid tip curves were acquired. During the period after the temperature was reset and before the calibration was updated, the previous calibration was used. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/11/2000 | 0000 | 11/20/2000 | 2359 |
Subject: | NSA/MWR/C1 - incorrect flagging of data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The wet window flag is set high more than expected. |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/07/2000 | 0000 | 12/22/2000 | 2359 |
Subject: | NSA/MWR/C1 - incorrect flagging of data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The wet window flag is set high more frequent than expected. |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/17/2000 | 0000 | 01/24/2001 | 1600 |
Subject: | SGP/MWR/C1 - IRT failure |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The IRT was damaged by internal moisture causing sky temperature measurements that are negatively biased compared to those from the AERI. IRT#0517 was returned to the manufacturer for repair and was replaced with spare IRT#1254. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/22/2000 | 2300 | 01/09/2001 | 2230 |
Subject: | NSA/MWR/C1 - NSA Barrow MWR down due to PC Virus |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsamwrtipC1.b1 |
Description: | On 12/22 at 23:00 the PC communication hung. Before operators returned to work after the holidays on 12/26, the virus W32.kriz triggered on 12/25 at 1:43 GMT. This virus wiped out large amount of files, hereunder the data files from the period 12/22 23:00 - 12/25 01:00 and OS system files. The fixed PC was re-installed on 1/5, due issues with using serial ports under DOS comunication with instrument was not restored until 1/9 @ 22:30 GMT |
Measurements: | nsamwrlosC1.a1:
nsamwrtipC1.b1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/31/2001 | 0900 | 02/06/2001 | 0237 |
Subject: | NSA/MWR/C1 - Reprocess: calibration change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The computer was replaced but not configured correctly for the MWR. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/27/2001 | 1900 | 09/29/2001 | 1000 |
Subject: | NSA/MWR/C1 - Reprocess: wrong calibration |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Moisture was found inside the lens of the MWR. Removal of the moisture caused a significant change in the calibration, especially in the 23.8 GHz channel. The calibration was updated automatically. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/11/1998 | 1800 | 12/11/1998 | 1810 |
12/12/1998 | 1030 | 12/12/1998 | 1050 |
12/13/1998 | 1200 | 12/13/1998 | 1210 |
12/14/1998 | 1800 | 12/14/1998 | 1810 |
12/15/1998 | 1800 | 12/15/1998 | 1810 |
12/16/1999 | 2200 | 12/16/1999 | 2300 |
Subject: | NSA/MWR/C1 - Contamination or Calibration Effect |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | A short period of odd data occurs in PWV and the LWP. Its a sudden offset in the data values. Vic Morris suggests it could be a calibration issue as seen before at SGP. Data make a marked change after the events (suggesting the data were questionable prior to this time). No obvious changes in other instruments occur. Some of these effects may coincide with operator's preventive maintenance but others are in the middle of the night local time and can not be explained by cleaning. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/1999 | 1750 | 01/06/1999 | 1800 |
01/08/1999 | 1740 | 01/08/1999 | 1800 |
01/11/1999 | 1740 | 01/11/1999 | 1800 |
01/12/1999 | 1740 | 01/12/1999 | 1800 |
Subject: | NSA/MWR/C1 - Frosting |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Spike in PWV and LWP . Operator reports instrument is frosted. Instrument teflon window was cleaned by operator. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/1999 | 0000 | 09/21/1999 | 0030 |
Subject: | NSA/MWR/C1 - Instrument maintenance |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Installed cold weather insulation on radiometer, required time to thermally stabilize. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/27/1999 | 2230 | 02/27/1999 | 2300 |
Subject: | NSA/MWR/C1 - MWR moved |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The MWR data are unreasonable during this period, because it was shutdown and moved by operations at this time. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/24/1999 | 1145 | 01/24/1999 | 2100 |
Subject: | NSA/MWR/C1 - negative PWV (bad calibration?) |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | During this time, the PWV drops to slightly negative values. This could be related to calibration issues. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/08/1998 | 0000 | 01/22/1999 | 2359 |
Subject: | NSA/MWR/C1 - Heater/blower removed |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Note that the heater/blower was removed from the MWR during this time. This may impact snow removal from teflon window, thereby affecting the quality of the data between cleanings. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/1998 | 1800 | 12/16/1998 | 1815 |
10/25/1999 | 1800 | 10/25/1999 | 1810 |
11/04/1999 | 1900 | 11/04/1999 | 1910 |
12/15/1999 | 2140 | 12/15/1999 | 2210 |
02/29/2000 | 1850 | 02/29/2000 | 1900 |
04/04/2000 | 1800 | 04/04/2000 | 1830 |
04/06/2000 | 1815 | 04/06/2000 | 1830 |
04/23/2000 | 0810 | 04/23/2000 | 0830 |
05/16/2000 | 0430 | 05/16/2000 | 0500 |
05/16/2000 | 0630 | 05/16/2000 | 0700 |
05/16/2000 | 1530 | 05/16/2000 | 1545 |
05/24/2000 | 1800 | 05/24/2000 | 1815 |
Subject: | NSA/MWR/C1 - Data spikes, possibly due to cleaning events |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Unreasonable spikes occurred, which may be due to cleaning of the instrument by the operator. Other cleaning events did not result in obvious data spikes and have not been included in this report. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/19/1994 | 0000 | 11/27/1998 | 1930 |
Subject: | SGP/MWR/C1 - Reprocess: IRT insufficiently insulated |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The downwelling IRT was insufficiently insulated to maintain an internal reference temperature above 0 degrees C. Measurements of sky temperature were over-estimated when instrument was below freezing. Data will be reprocessed, but users can correct data using the following correction factor: If T_reference < -5?C, then IRT_corrected = (IRT_original - 32.993K)/0.87238 where T_reference can be estimated with the ambient temperature (e.g. tkair) |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/04/2002 | 0824 | 03/16/2002 | 0056 |
Subject: | NSA/MWR/C1 - MWR digital board failure |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | A power failure at the site apparently damaged some of the components of the digital board. The MWR was replaced with a spare unit and returned to the manufacturer for repair. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/31/2002 | 2034 | 11/05/2002 | 1815 |
Subject: | SGP/MWR/B4/C1 - LOS cycle skipping |
DataStreams: | sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | When MWR software version 4.12 was installed at the SGP, it was observed that the MWRs at CF and BF4 skip line-of-sight (LOS) observing cycles. In LOS mode, the software begins an observing cycle at 0, 20, and 40 seconds after the minute to provide 3 LOS cycles per minute. If a cycle is delayed so that it takes more than 20 seconds to complete, then the next start time is missed, the cycle is skipped, and the data that would have been acquired are lost. It was demonstrated that the interaction with the IRT at CF slowed the MWR observing cycle noticeably and contributed significantly to the LOS cycle skipping. The IRT was removed from the MWR on 5 November 2002 and the LOS cycle skipping at the CF was resolved. The IRT data are now available in a new separate datastream: sgpirtC1.a1 (and soon sgpirt2sC1.a1). The BF4 cycle skipping may have resulted from a combination of an additional air temperature sensor on this instrument and the use of a fiber optic cable. However, the cycle skipping on this instrument appears to have abated without modifications to the instrument configuration. |
Measurements: | sgpmwrlosB4.b1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/17/1999 | 1800 | 07/31/2002 | 2034 |
Subject: | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | Several related and recurring problems with the SGP MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data (especially at Purcell), spikes in the data (especially at Vici), negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program (especially at the CF). Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which has not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/07/1999 | 1800 | 09/16/2002 | 1820 |
Subject: | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | Several related and recurring problems with the MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data, spikes in the data, negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program. Because these all initially appeared to be hardware-related problems, the instrument mentor and site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which did not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/04/2002 | 2200 | 10/31/2002 | 2220 |
Subject: | TWP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
DataStreams: | twpmwrlosC1.b1 |
Description: | Several related and recurring problems with the MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data, spikes in the data, negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program. Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which did not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2003 | 1906 | 01/15/2005 | 0054 |
Subject: | NSA/MWR/C1 - no air temperature signal |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air temperature sensor failed to properly report. It was determined that the wires carrying the signal to the analog board did not conform to the standard expected by the upgraded blower. The problem was corrected by changing the wiring and modifying the MWR software to read the signal from the appropriate corresponding channel. |
Measurements: | nsamwrC1.00:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/2002 | 0000 | 02/10/2003 | 2359 |
Subject: | SGP/MWR/C1 - Incorrect min and max values |
DataStreams: | sgpmwrlosC1.b1 |
Description: | The values of valid_min and valid_max applied to fields tkxc and tknd were incorrect. They should be 303 and 333, respectively. |
Measurements: | sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/02/1998 | 0000 | 02/08/2003 | 2359 |
Subject: | NSA/MWR/C1 - min/max/delta values incorrect |
DataStreams: | nsamwrlosC1.b1 |
Description: | The values of valid_min, valid_max, and valid_delta for fields tkxc and tknd were incorrect. They should be 303, 333, and 0.5 K, respectively. |
Measurements: | nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/22/2003 | 2115 | 09/30/2004 | 1835 |
Subject: | SGP/MWR/C1 - no air temperature signal |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air temperature sensor failed to properly report. It was determined that the wires carrying the signal to the analog board did not conform to the standard expected by the upgraded blower. The problem was corrected by changing the wiring. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/07/2004 | 2007 | 01/09/2004 | 0032 |
Subject: | NSA/MWR/C1 - damaged window |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
Description: | The MWR dielectric window was damaged by snow from a snow blower and replaced. |
Measurements: | nsamwrlosC1.a1:
nsaqmemwrcolC1.c1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 02/18/2004 | 2250 |
Subject: | TWP/MWR/C1 - wrong azimuth |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR was initially installed at an azimuth angle defined as 180 degrees but the value in the configuration file was not changed from the default of 0 degrees. In examining photos taken during the installation of the AWS tower, I noticed that the MWR was rotated opposite the normal orientation. The value in the configuration file was changed to reflect the actual azimuth of the instrument. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/2004 | 0847 | 02/17/2004 | 0156 |
Subject: | NSA/MWR/C1 - power supply failure |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The MWR failed due to infiltration of blowing snow which damaged the electronics. The digital and analog boards were replaced by new boards supplied by Radiometrics and the power supply was replaced by the unit from the spare MWR. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/1999 | 0000 | 12/21/1999 | 2359 |
11/10/2000 | 0000 | 12/08/2000 | 2359 |
01/26/2001 | 0000 | 03/05/2001 | 2359 |
12/18/2001 | 0000 | 12/31/2001 | 2359 |
02/11/2002 | 0000 | 02/28/2002 | 2359 |
02/19/2003 | 0000 | 03/26/2003 | 2359 |
10/15/2003 | 0000 | 11/03/2003 | 2359 |
Subject: | SGP/MWR/C1 - Wet window flag "on" more frequently than expected |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The wet window flag was set "on" more frequently than expected during the time periods specified. This indicates the heater has been running more than necessary. In most instances the moisture sensitivity was adjusted at the end of these periods. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/2004 | 2114 | 09/24/2004 | 1354 |
09/26/2004 | 2332 | 09/27/2004 | 0317 |
09/27/2004 | 1214 | 09/30/2004 | 1820 |
Subject: | SGP/MWR/C1 - Instrument problem |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The MWR mixer temperature, blackbody temperature, and moisture flag are incorrect. This began when the instrument was returned to service after the analog board was temporarily removed to check the presence and absence of certain resistors. The board must have been accidently damaged during this process. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/30/2004 | 1835 | 10/13/2004 | 2118 |
Subject: | SGP/MWR/C1 - thermal instability |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The analog board was replaced with a spare (D041001.3) with a reference temperature that was set too low (306 K) so that during periods of high ambient temperature, the instrument became thermally unstable. The problem was corrected when the temperature setting was increased (to 311 K). |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/2004 | 1643 | 11/11/2004 | 2100 |
Subject: | SGP/MWR/C1 - Reprocess: wrong retrievals |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
Description: | When the computer and core configuration were upgraded, retrieval coefficients for BF1 were accidently included in the configuration file. The correct coefficients for CF1 were applied when the configuration file was updated. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpqmemwrcolC1.c1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/13/2004 | 1000 | 12/13/2004 | 2330 |
Subject: | NSA/C1 - Site-wide power failure |
DataStreams: | nsa915rwptempconC1.a1, nsa915rwptempmomC1.a0, nsa915rwptempspecC1.a0, nsa915rwpwindconC1.a1, nsa915rwpwindmomC1.a0, nsa915rwpwindspecC1.a0, nsaaerich1C1.b1, nsaaerich2C1.b1, nsaaeriengineerC1.b1, nsaaerisummaryC1.b1, nsamettwr4hC1.b1, nsammcrmomC1.b1, nsamplC1.a1, nsamplpsC1.a0, nsamwrlosC1.b1, nsamwrpC1.b1, nsamwrtipC1.a1, nsatwrcam40mC1.a1, nsavceil25kC1.b1 |
Description: | The Barrow facility experienced a site-wide power failure on 12/13. Power was restored to most instruments between 2250 and 2330 GMT. |
Measurements: | nsa915rwpwindconC1.a1:
nsatwrcam40mC1.a1:
nsa915rwptempconC1.a1:
nsa915rwpwindmomC1.a0:
nsamplC1.a1:
nsamplpsC1.a0:
nsamwrpC1.b1:
nsa915rwptempspecC1.a0:
nsa915rwptempmomC1.a0:
nsamettwr4hC1.b1:
nsaaeriengineerC1.b1:
nsaaerich2C1.b1:
nsaaerisummaryC1.b1:
nsamwrtipC1.a1:
nsavceil25kC1.b1:
nsa915rwpwindspecC1.a0:
nsamwrlosC1.b1:
nsaaerich1C1.b1:
nsammcrmomC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2005 | 0054 | 01/19/2005 | 1143 |
Subject: | NSA/MWR/C1 - poor air temperature values |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | After the air temperature sensor was rewired due to a change with the new blower (D030515.3), the measurement was initially incorrect. There is no apparent cause for the bad signal or its improvement. |
Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/20/2003 | 1558 | 08/22/2003 | 2059 |
Subject: | SGP/MWR/C1 - spare instrument |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The spare MWR, S.N. 04, was installed while the production instrument, S.N. 10, was returned to the manufacturer for upgrades. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/09/2005 | 0000 | 06/09/2005 | 1500 |
Subject: | PYE/MWR/M1 - Instrument computer locked up |
DataStreams: | pyemwrlosM1.b1 |
Description: | The MWR computer locked up and required a reboot at 00Z on June 9, 2005. When the program was restarted, water vapor, liquid path, and temps dropped to zero. They did not recover until 15Z the same day. |
Measurements: | pyemwrlosM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/16/2002 | 2000 | 06/28/2005 | 2300 |
Subject: | SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients |
DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). Although the MWR data will be reprocessed to apply the new monortm-based retrievals, for most purposes it will be sufficient to correct the data using the following factors: PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ LWP_MONORTM = 1.026 * LWP_ROSENKRANZ The Rosenkranz-based retrieval coefficients became active as follows (BCR 456): SGP/C1 (Lamont) 4/16/2002, 2000 SGP/B1 (Hillsboro) 4/12/2002, 1600 SGP/B4 (Vici) 4/15/2002, 2300 SGP/B5 (Morris) 4/15/2002, 2300 SGP/B6 (Purcell) 4/16/2002, 2200 SGP/E14(Lamont) 4/16/2002, 0000 NSA/C1 (Barrow) 4/25/2002, 1900 NSA/C2 (Atqasuk) 4/18/2002, 1700 TWP/C1 (Manus) 5/04/2002, 0200 TWP/C2 (Nauru) 4/27/2002, 0600 TWP/C3 (Darwin) inception The MONORTM-based retrieval coefficients became active as follows (BCR 984): SGP/C1 (Lamont) 6/28/2005, 2300 SGP/B1 (Hillsboro) 6/24/2005, 2100 SGP/B4 (Vici) 6/24/2005, 2100 SGP/B5 (Morris) 6/24/2005, 2100 SGP/B6 (Purcell) 6/24/2005, 1942 SGP/E14(Lamont) 6/28/2005, 2300 NSA/C1 (Barrow) 6/29/2005, 0000 NSA/C2 (Atqasuk) 6/29/2005, 0000 TWP/C1 (Manus) 6/30/2005, 2100 TWP/C2 (Nauru) 6/30/2005, 2100 TWP/C3 (Darwin) 6/30/2005, 2100 PYE/M1 (Pt. Reyes) 4/08/2005, 1900** ** At Pt. Reyes, the original retrieval coefficients implemented in March 2005 were based on a version of the Rosenkranz model that had been modified to use the HITRAN half-width at 22 GHz and to be consistent with the water vapor continuum in MONORTM. These retrievals yield nearly identical results to the MONORTM retrievals. Therefore the Pt. Reyes data prior to 4/08/2005 may not require reprocessing. |
Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpqmemwrcolC1.c1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/01/2005 | 0700 | 05/06/2005 | 0000 |
Subject: | PYE/MWR/M1 - Reprocessed: Revised Retrieval Coefficients |
DataStreams: | pyemwrlosM1.b1, pyemwrtipM1.a1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid water absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). At Point Reyes, the original coefficients implemented in March 2005 were based on a version of the Rosenkranz model that had been modified to use the HITRAN half-width at 22 GHz and to be consistent with the water vapor continuum in MONORTM. These retrievals yielded nearly identical results to the MONORTM retrievals. The MONORTM-based retrieval coefficients became active at PYE.M1 20050506. Note: The PYE.M1 MWRLOS data for 20050201-20050506 have been reprocessed to apply the MONORTM-based retrievals for all time. The reprocessed data were archived in April 2007. The TIP data have not been reprocessed. |
Measurements: | pyemwrtipM1.a1:
pyemwrlosM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/25/2002 | 1900 | 06/29/2005 | 0000 |
Subject: | NSA/MWR/C1 - Reprocess: Revised Calibration Coefficients |
DataStreams: | nsa5mwravgC1.c1, nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1, nsaqmemwrcolC1.c1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). Although the MWR data will be reprocessed to apply the new monortm-based retrievals, for most purposes it will be sufficient to correct the data using the following factors: PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ LWP_MONORTM = 1.026 * LWP_ROSENKRANZ The Rosenkranz-based retrieval coefficients became active at NSA.C1 20020425.1900. The MONORTM-based retrieval coefficients became active at NSA.C1 20050629.0000. Note: a reprocessing effort is already underway to apply the Rosenkranz-based retrieval coefficients to all MWR prior to April 2002. An additional reprocessing task will be undertaken to apply the MONORTM retrieval to all MWR data when the first is completed. Read reprocessing comments in the netcdf file header carefully to ensure you are aware which retrieval is in play. |
Measurements: | nsamwrlosC1.a1:
nsa5mwravgC1.c1:
nsaqmemwrcolC1.c1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/04/2002 | 0200 | 06/30/2005 | 2100 |
Subject: | TWP/MWR/C1 - Reprocessed: Revised Retrieval Coefficients |
DataStreams: | twp5mwravgC1.c1, twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). The Rosenkranz-based retrieval coefficients became active at TWP.C1 20020504.0200. The MONORTM-based retrieval coefficients became active at TWP.C1 20050630.2100. Note: The TWP.C1 data for 19961011-20050630 have been reprocessed to apply the |
Measurements: | twpmwrlosC1.b1:
twp5mwravgC1.c1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/29/2005 | 0000 | 07/17/2005 | 2100 |
Subject: | PYE/MWR/M1 - Reprocessed: Calibration corrected |
DataStreams: | pyemwrlosM1.b1, pyemwrtipM1.a1 |
Description: | On May 28 1:30 GMT the NFOV radiometer was placed in the field of view of the MWR tip calibration. Almost immediately calibration of the MWR was compromised resulting in incorrect brightness temperatures and overestimation of both PWV and LWP. On July 15 the NFOV radiometer was moved away from the MWR and the instantaneous calibration values jumped back to normal. The median values returned to normal on July 17 around 2100. The LOS data were reprocessed using interpolated values for the calibration coefficients. The reprocessed data are available from the ARM Archive effective December 7, 2005. NOTE: the format of the reprocessed data are slightly different than the format of the original data and the data available before and after the reprocessed data period. The quality of the data are not affected, just the format. The MWRTIP data can not be reprocessed and should be used with caution. |
Measurements: | pyemwrtipM1.a1:
pyemwrlosM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/09/2005 | 2354 | 07/20/2005 | 0000 |
Subject: | NSA/MWR/C1 - Possible loss of accuracy due to missing blower |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | On 7/09 the MWR blower failed. The blower prevents snow and liquid drop from accumulating on the window. Accumulation of snow or liquid results in a loss of accuracy of the instrument. The loss of accuracy has consequencies on the retrieved liquid water path and precipitable water vapor. Usually there will be an overestimation of liquid and vapor. The blower was repaired and reinstalled on 7/20. Between 7/9 and 7/20 the tkair variable is unavailable as well. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/28/2005 | 1400 | 08/05/2005 | 1700 |
Subject: | SGP/MWR/C1 - Instrument noise problem |
DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | Various variables including the mixer temperatures were very noisy. After several attempts to fix the problem, the instrument was taken off line and returned to the manufacturer for repair. |
Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/05/2005 | 1952 | 09/01/2005 | 1945 |
Subject: | NSA/MWR/C1 - Missing Data |
DataStreams: | nsa5mwravgC1.c1, nsamwrC1.00, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | Instrument was removed for repair. |
Measurements: | nsa5mwravgC1.c1:
nsamwrC1.00:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/13/2005 | 0000 | 10/18/2005 | 2000 |
Subject: | NSA/MWR/C1 - Instrument problem, Heater problem |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1 |
Description: | The heater of the MWR was ON all the time even when the moisture sensor was dry. Jim Liljegren suspected a problem with the relay that activates the heater. The suggested action was to send the faulty assembly to SGP for repair and get a spare unit from SGP. The spare unit was sent on 9/15 and was installed on 10/18. |
Measurements: | nsamwrC1.00:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/01/2005 | 0700 | 09/13/2005 | 1805 |
Subject: | PYE/MWR/M1 - New software version (4.15) installed |
DataStreams: | pyemwrlosM1.b1, pyemwrtipM1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in July 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software, version 4.15, was installed on 9/13/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | pyemwrtipM1.a1:
pyemwrlosM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/31/2002 | 2200 | 09/13/2005 | 1854 |
Subject: | TWP/MWR/C1 - New software version (4.15) installed |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in October 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software version (4.15) was installed on 9/13/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/16/2002 | 1820 | 09/15/2005 | 1702 |
Subject: | NSA/MWR/C1 - New software version (4.15) installed |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in September 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software version (4.15) was installed on 9/15/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/2005 | 1945 | 09/06/2005 | 1500 |
Subject: | NSA/MWR/C1 - Reprocess: wrong calibration |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | When MWR#20 was returned to service on 9/1/2005, the calibration had changed as a result of the repairs made by Radiometrics and the RF deck temperature had been set to 325K for testing. On 9/2, the temperature was decreased to 307K to prevent thermal instability in winter and the calibration was changed in the configuration file with the values supplied on the repair report. The data need to be reprocessed with the calibration coefficients that were automatically derived after these changes were put into affect. They are: tnd_nom23=185.621, tnd_nom31=158.801, tc23=-0.022, tc31=-0.039. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/31/2002 | 2027 | 08/04/2005 | 1959 |
Subject: | SGP/MWR/C1 - New software version (4.15) installed |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | A problem began with the installation of MWR.EXE version 4.12 in July 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software, version 4.15, was installed on 08/04/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/27/2005 | 2200 | 09/30/2005 | 2000 |
Subject: | NSA/MWR/C1 - Incorrect time stamp |
DataStreams: | nsamwrC1.00, nsamwrlosC1.b1 |
Description: | On Sept 27 the motherboard of the MWR computer was replaced. Following the replacement, the date on the computer was not set to the correct time of day, therefore the date and time in the files were wrong. The time on the computer was reset on Sept. 30. Time stamps between Sept. 27 and Sept. 30 were later corrected based on gathered information, however they may have as much as 5 minutes of uncertainty. |
Measurements: | nsamwrC1.00:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2006 | 0000 | 01/08/2007 | 0000 |
Subject: | NIM/MWR/M1 - Instrument noise problem/RF interference |
DataStreams: | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
Description: | Data are affected by intermittent spikes that become more frequent starting in March 2006. Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably RF interference. |
Measurements: | nimmwrlosM1.b1:
nimmwrM1.00:
nimmwrtipM1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 02/27/1999 | 1200 |
Subject: | TWP/MWR/C1 - Software Change |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR operating software was changed on 27 February 1999 to provide additional functionality as described below. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated, and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/02/1998 | 0000 | 02/03/1999 | 1200 |
Subject: | NSA/MWR/C1 - software upgrade (version 3.28) |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The MWR operating program was upgraded to version 3.28 on 3 February 1999. This version includes a beam width correction as well as providing the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto- leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1996 | 0000 | 03/15/1999 | 1700 |
Subject: | TWP/MWR/C1 - software upgrade (version 3.29) |
DataStreams: | twpmwrlosC1.b1 |
Description: | The MWR operating program was upgraded to version 3.29 on 15 March 1999. This version included a beam width correction as well as provided the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/2006 | 1200 | 07/28/2006 | 1600 |
Subject: | SGP/MWR/C1 - Spikes in ambient temperature readings |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | There are intermittent spikes in the Tkair temperature (T ~ 400 K). On 7/28 the sensor was cleaned and the instrument power cycled following a power outage. Readings came back to normal. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/14/2006 | 0000 | 07/28/2006 | 0000 |
Subject: | NSA/MWR/C1 - TKAIR sensor failure |
DataStreams: | nsamwrlosC1.b1 |
Description: | Between 7/14 and 7/28 the tkair variable is missing most of the time and sometimes has large negative spikes. On 7/28, the sensor was cleaned of corrosion and the readings came back to normal. |
Measurements: | nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/01/2006 | 0000 | 01/08/2007 | 0000 |
Subject: | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. |
DataStreams: | nimmwrlosM1.b1, nimmwrtipM1.a1 |
Description: | The radiometer was intermittently thermally unstable resulting in poor calibrations for four brief time periods. These data have been reprocessed to apply corrected calibrations. The affected time periods were: 20060302-20060303 20060423-20060425 20060512-20060515 20060531-20060603 |
Measurements: | nimmwrlosM1.b1:
nimmwrtipM1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/01/2006 | 0000 | 08/31/2006 | 2300 |
Subject: | NIM/MWR/M1 - Sun in field of view of radiometer |
DataStreams: | nimmwrlosM1.b1 |
Description: | Around 12 pm every day between 8/1 and 8/31 there is an increase in the brightness temperature due to the sun being in the field of view of the radiometer. |
Measurements: | nimmwrlosM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/05/2006 | 1100 | 10/23/2006 | 1600 |
Subject: | NSA/MWR/C1 - Rain sensor always on |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The rain sensor was always on between 10/5 and 10/23 2006. The user should be aware that not all data flagged as rainy are actually rainy. The problem was caused by a shift in the sensitivity of the rain sensor and was corrected by changing the sensor threshold in the configuration file. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2006 | 1000 | 01/30/2007 | 0457 |
Subject: | TWP/MWR/C1 - Radiometer failure |
DataStreams: | twpmwrC1.00, twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The instrument stopped responding and had to be powered off. Suspect cause of failure is a faulty digital board. |
Measurements: | twpmwrC1.00:
twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/09/1996 | 2338 | 12/11/1996 | 0003 |
02/28/1997 | 0118 | 06/27/1997 | 2048 |
11/06/1997 | 1959 | 11/12/1997 | 1800 |
01/05/1998 | 0204 | 01/08/1998 | 2048 |
04/21/1998 | 0017 | 04/29/1998 | 1803 |
09/13/1998 | 0759 | 09/20/1998 | 0900 |
11/20/1998 | 2226 | 11/27/1998 | 1026 |
02/27/1999 | 0600 | 03/02/1999 | 0159 |
03/06/1999 | 0800 | 03/09/1999 | 1807 |
09/03/1999 | 0300 | 09/10/1999 | 0400 |
10/01/1999 | 0900 | 10/18/1999 | 0000 |
10/20/1999 | 0500 | 10/22/1999 | 0600 |
01/14/2000 | 0800 | 01/16/2000 | 0342 |
01/14/2006 | 1258 | 01/16/2006 | 0638 |
Subject: | TWP/MWR/C1 - Missing data |
DataStreams: | twpmwrlosC1.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | twpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/12/2007 | 0000 | 01/15/2007 | 0000 |
Subject: | SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag |
DataStreams: | sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1 |
Description: | Between 01/12 and 01/15 brightness temperatures show high values (Tb > 100 K) indicative of rain, however the wet_window flag is 0 (indicative of no rain). During that time there where freezing conditions with ice pellets that were not detected by the sensor. The high brightness temperatures may be due to melting ice on the window. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/07/2007 | 0000 | 04/02/2007 | 2359 |
03/01/2008 | 0000 | 04/02/2008 | 2359 |
09/10/2008 | 0000 | 10/12/2008 | 0000 |
03/01/2009 | 0000 | 04/02/2009 | 2359 |
09/11/2009 | 0000 | 10/10/2009 | 2359 |
Subject: | TWP/MWR/C1/C2 - Sun in the field of view |
DataStreams: | twpmwrlosC1.b1, twpmwrlosC2.b1, twpmwrtipC1.a1, twpmwrtipC2.a1 |
Description: | Every day between around noon local time (usually between 1 and 2 AM UTC time) there is an increase in the brightness temperatures due to the sun in the field of view of the radiometer. |
Measurements: | twpmwrlosC2.b1:
twpmwrlosC1.b1:
twpmwrtipC1.a1:
twpmwrtipC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/12/2007 | 0700 | 06/13/2007 | 2000 |
06/16/2007 | 2100 | 06/17/2007 | 2100 |
Subject: | TWP/MWR/C1 - Intermittent data |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | After a computer change the MWR program did not restart properly. Data are intermittent between 6/12 and 6/17. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/14/2007 | 0000 | 08/03/2007 | 1508 |
Subject: | SGP/MWR/C1 - Noisy data |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | Since 7/14 the MWR is experiencing intermittent periods of increased noise. The cause for this is under investigation. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/19/2007 | 2136 | 11/22/2007 | 1400 |
Subject: | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess |
DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | After the radiometer was reinstalled it had to update the calibration coefficients. Data will be reprocessed |
Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/21/2007 | 0000 | 12/11/2007 | 0355 |
Subject: | TWP/MWR/C1 - Incorrect ambient temperature readings |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | Starting on 11/21 the ambient temperature readings are intermittent and have spikes. Site operators replaced the dew-blower on 12/11 and readings came back to normal |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/21/1993 | 1809 | 07/23/1993 | 1541 |
08/07/1993 | 2143 | 08/09/1993 | 1308 |
08/14/1993 | 2233 | 08/16/1993 | 1300 |
08/29/1993 | 1207 | 08/31/1993 | 1206 |
09/17/1993 | 2158 | 09/20/1993 | 1311 |
10/02/1993 | 1612 | 10/04/1993 | 1338 |
10/09/1993 | 0741 | 10/11/1993 | 1319 |
11/12/1993 | 1207 | 11/15/1993 | 1413 |
11/19/1993 | 2027 | 11/21/1993 | 1957 |
12/14/1993 | 2300 | 03/21/1994 | 1759 |
03/28/1994 | 1459 | 03/30/1994 | 2225 |
05/16/1994 | 1900 | 05/19/1994 | 2018 |
06/22/1994 | 1600 | 07/11/1994 | 1859 |
07/16/1994 | 0300 | 07/19/1994 | 2006 |
09/03/1994 | 1647 | 09/05/1994 | 1341 |
09/09/1994 | 2325 | 09/11/1994 | 1543 |
12/17/1994 | 0049 | 12/19/1994 | 1441 |
01/05/1995 | 0000 | 01/05/1995 | 2359 |
01/28/1995 | 0054 | 01/30/1995 | 1443 |
04/01/1995 | 0000 | 04/03/1995 | 1610 |
05/09/1995 | 2200 | 05/11/1995 | 2350 |
06/24/1995 | 0903 | 06/26/1995 | 0159 |
07/07/1995 | 1625 | 07/10/1995 | 1409 |
07/19/1995 | 1741 | 07/21/1995 | 1906 |
07/28/1995 | 1900 | 07/31/1995 | 1918 |
08/22/1995 | 1616 | 08/25/1995 | 2359 |
12/01/1995 | 1434 | 01/11/1996 | 2214 |
01/12/1996 | 2000 | 01/23/1996 | 2030 |
01/23/1996 | 2332 | 02/08/1996 | 2359 |
08/06/1996 | 0000 | 08/06/1996 | 2359 |
09/04/1996 | 1910 | 09/08/1996 | 2359 |
09/14/1996 | 0700 | 09/16/1996 | 1759 |
09/30/1996 | 0000 | 09/30/1996 | 2359 |
12/01/1996 | 0000 | 12/01/1996 | 2359 |
07/01/1997 | 0000 | 07/01/1997 | 2359 |
02/20/1998 | 2339 | 02/22/1998 | 0042 |
05/04/1998 | 0000 | 05/04/1998 | 2359 |
07/18/1998 | 0337 | 07/20/1998 | 1355 |
09/28/1998 | 0000 | 09/28/1998 | 2359 |
10/10/1998 | 2359 | 10/12/1998 | 1959 |
10/17/1998 | 1705 | 10/19/1998 | 1535 |
12/25/1998 | 2233 | 12/28/1998 | 2026 |
02/06/1999 | 1235 | 02/08/1999 | 1652 |
03/13/1999 | 2048 | 03/15/1999 | 2040 |
07/23/1999 | 2059 | 07/26/1999 | 1408 |
12/04/1999 | 0800 | 12/06/1999 | 1821 |
01/07/2000 | 1446 | 02/02/2000 | 2224 |
05/24/2000 | 1455 | 05/31/2000 | 1505 |
06/06/2000 | 1620 | 06/14/2000 | 1451 |
09/01/2000 | 2200 | 09/05/2000 | 1526 |
09/15/2000 | 2057 | 09/18/2000 | 1339 |
09/23/2000 | 1236 | 09/25/2000 | 1430 |
01/13/2001 | 2011 | 01/16/2001 | 1647 |
02/24/2001 | 0230 | 02/26/2001 | 1508 |
03/03/2001 | 0701 | 03/05/2001 | 1546 |
03/10/2001 | 0702 | 03/12/2001 | 1535 |
03/17/2001 | 0702 | 03/19/2001 | 1422 |
03/24/2001 | 0703 | 03/26/2001 | 1516 |
03/30/2001 | 2038 | 04/02/2001 | 1423 |
05/05/2001 | 1042 | 05/07/2001 | 1514 |
05/18/2001 | 1534 | 05/21/2001 | 1451 |
06/22/2001 | 2200 | 06/25/2001 | 1438 |
06/30/2001 | 0616 | 07/02/2001 | 1435 |
07/28/2001 | 1944 | 07/30/2001 | 1357 |
08/24/2001 | 1348 | 08/27/2001 | 1751 |
09/07/2001 | 1842 | 09/10/2001 | 1439 |
09/15/2001 | 1533 | 09/17/2001 | 1459 |
10/13/2001 | 0033 | 10/15/2001 | 1526 |
11/03/2001 | 0840 | 11/05/2001 | 1613 |
11/10/2001 | 0558 | 11/13/2001 | 1518 |
11/16/2001 | 1701 | 11/19/2001 | 1706 |
12/21/2001 | 2153 | 12/24/2001 | 1442 |
01/30/2002 | 0845 | 02/11/2002 | 1632 |
03/02/2002 | 0339 | 03/04/2002 | 1533 |
03/09/2002 | 0340 | 03/11/2002 | 1621 |
06/26/2002 | 1639 | 06/28/2002 | 2057 |
09/01/2002 | 1002 | 09/03/2002 | 1332 |
12/21/2002 | 1124 | 12/23/2002 | 1510 |
01/04/2003 | 0703 | 01/06/2003 | 1529 |
08/09/2003 | 0037 | 08/11/2003 | 1456 |
08/23/2003 | 2101 | 08/25/2003 | 1456 |
10/12/2003 | 2025 | 10/14/2003 | 1414 |
11/29/2003 | 1840 | 12/01/2003 | 1502 |
01/24/2004 | 0743 | 01/26/2004 | 1505 |
02/14/2004 | 2316 | 02/17/2004 | 1520 |
09/04/2004 | 0250 | 09/07/2004 | 1419 |
10/09/2004 | 0745 | 10/11/2004 | 1739 |
10/16/2004 | 2250 | 10/18/2004 | 1355 |
11/13/2004 | 1849 | 11/15/2004 | 1521 |
12/03/2004 | 1940 | 12/06/2004 | 1454 |
01/15/2005 | 0652 | 01/18/2005 | 1446 |
01/22/2005 | 1449 | 01/24/2005 | 1444 |
06/10/2005 | 2118 | 06/13/2005 | 1603 |
08/05/2005 | 1701 | 08/30/2005 | 2001 |
10/07/2005 | 1658 | 11/16/2005 | 1945 |
11/18/2005 | 1801 | 11/21/2005 | 1521 |
11/23/2005 | 2201 | 11/25/2005 | 1550 |
11/26/2005 | 0101 | 11/28/2005 | 1543 |
12/03/2005 | 1043 | 12/05/2005 | 1559 |
01/14/2006 | 1822 | 01/17/2006 | 1512 |
01/21/2006 | 0708 | 01/23/2006 | 1515 |
02/03/2006 | 1903 | 02/06/2006 | 1533 |
02/25/2006 | 0730 | 02/27/2006 | 1420 |
07/01/2006 | 2225 | 07/03/2006 | 1413 |
11/28/2006 | 2143 | 12/01/2006 | 1911 |
06/09/2007 | 1150 | 06/11/2007 | 1300 |
07/07/2007 | 1642 | 07/09/2007 | 1304 |
08/03/2007 | 1601 | 11/19/2007 | 2135 |
12/22/2007 | 2112 | 12/24/2007 | 1504 |
05/25/2008 | 1815 | 05/27/2008 | 1335 |
06/06/2008 | 1512 | 06/09/2008 | 0238 |
05/08/2009 | 1535 | 05/11/2009 | 1254 |
Subject: | SGP/MWR/C1 - Missing data |
DataStreams: | sgpmwrlosC1.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/02/2008 | 0000 | 06/04/2008 | 2200 |
Subject: | NSA/MWR/C1 - Spikes in air temperature readings |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | During this month there are occasional negative spikes in the Tkair variable. The problem may be corrosion in the temperature sensor or the infiltration of water from melting snow. The dewblower was replaced and a new sensor installed |
Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/06/2008 | 2200 | 06/20/2008 | 0200 |
Subject: | NSA/MWR/C1 - Missing surface air temperature data |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | Some wires in the dewblower were not correctly configured. |
Measurements: | nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/2008 | 0000 | 09/30/2008 | 2359 |
Subject: | TWP/MWR/C1 - Short periods of wrong ambient temperature |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | During this month there are a few intermittent instances of bad ambient temperature readings. I will summarize here these short time ranges: 20080909 between 02:00 and 03:00 UTC 20080909 between 09:00 and 14:00 UTC Additionally the ambient temperature has short but frequent data gaps. The data gaps are very short (less than one hour). Users could interpolate missing data or use alternative sensors such as the surface meteorological data available for the site. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/01/2008 | 0000 | 11/30/2008 | 2300 |
Subject: | SGP/MWR/C1 - Increased noise in 31.4 GHz channel |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The 31.4 GHz channel has been showing an increased level of noise which results in increased noise in the LWP retrievals. The instrument is tipping and all other parameters seem to be in the range. The elevate noise started in May, but it seems to have become slightly worse after summer. After November the noise level seems to have gone back to normal. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/09/2008 | 0000 | 12/09/2008 | 1800 |
Subject: | NSA/MWR/C1 - Incorrect brightness temperatures and retrievals |
DataStreams: | nsa5mwravgC1.c1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The brightness temperatures and retrieved PWV and LWP show a sudden jump and have values that are too high. The suddenly jump back to normal at around 1800 UTC. All other parameters seem reasonable so the cause of the jump may just be due to accumulation of either snow or melting ice on the radome. |
Measurements: | nsa5mwravgC1.c1:
nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/03/2008 | 1900 | 02/06/2009 | 0530 |
Subject: | TWP/MWR/C1 - Ambient temperature data missing |
DataStreams: | twpmwrlosC1.b1, twpmwrtipC1.a1 |
Description: | The ambient temperature readings (tkair) suddenly failed. The sensor was replaced on Feb 6. |
Measurements: | twpmwrlosC1.b1:
twpmwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/15/2009 | 2100 | 04/15/2009 | 2300 |
04/16/2009 | 1715 | 04/16/2009 | 2200 |
Subject: | NSA/MWR/C1 - RFI screening test |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The instrument was covered with a shield to test the effect on the RF interference that is affecting the measurements since February. The test was performed on 4/15 and 4/16 for a few hours. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/13/2009 | 0000 | 10/15/2009 | 1800 |
Subject: | NSA/MWR/C1 - High noise in 23.8-GHz channel |
DataStreams: | nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | Starting approximately on February 13 the MWR experienced high level of noise in the 23.8 GHz channel. The spikes became more prominent around Feb 17 and increased after that date as well. The cause of the interference was identified as the nearby MWRP on Oct 13 and the instruments were realigned. |
Measurements: | nsamwrtipC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/01/2009 | 0000 | 06/16/2009 | 0745 |
Subject: | GRW/MWR/M1 - Loose mirror |
DataStreams: | grwmwrlosM1.b1, grwmwrtipM1.a1 |
Description: | The data from the MWR were suspicious and became progressively worse. The problem was traced back to the fact that the screw that keeps the mirror in place had become loose and the mirror was freely rotating. The mirror was tightened on 6/9/2009, however the measurements were noisy until 6/16, when the instrument was rebooted and all the connections checked. Measurements between 5/1 and 6/9 should not be used. Data between 6/9 and 6/16 are usable, although they are very noisy. |
Measurements: | grwmwrlosM1.b1:
grwmwrtipM1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/1994 | 0000 | 08/16/1994 | 2359 |
Subject: | SGP/MWR/C1 - IRT rain lid removal |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The IR thermometer (or IRT) was deployed at the SGP central facility in January 1994 with an automatic mechanism which closed a protective lid over the zenith-viewing lens when a moisture detector indicated condensation or precipitation. Since that time the 120 VAC-to-12 VAC transformer in the lid mechanism has failed 5 times with an average downtime of two weeks. In addition, the collar by which the (normally open) lid is attached to the lens barrel of the IRT has made it difficult for site operations personnel to observe the condition of the IRT lens. As a result, dirt and insects have been able to accumulate on the lens. This has resulted in long periods of invalid data. To alleviate these problems the lid mechanism was removed from service on 16 August at my recommendation. It is anticipated that condensation and precipitation will result in invalid data. However, these events should be readily detectable because the observed IR temperature will closely match the ambient temperature (e.g. the temperature of the moisture on the lens) which is usually much greater than the sky or cloud base temperature normally measured. I believe that this will not result in a large increase in invalid data because these data would have been invalid anyway when the lid was closed. (This situation is now the same as for the other radiometers at the site.) In addition, removing the attaching collar from the lens barrel will prevent insects from nesting in it, and will permit site operations personnel easy access to the lens so that they may more easily maintain it in a clean condition. A summary of the quality of the IR thermometer data in general, including notes on the performance of the protective lid, follows: JANUARY 1994 19-JAN: Operational. No IR data collected. FEBRUARY 1994 2-FEB: Failure of lid reported. Transformer burned out. 15-FEB: IRT returned to service. 24-FEB: Valid data begin. MARCH 1994 3-MAR: Failure of lid reported. Transformer burned out. 8-MAR: IRT returned to service. 8-MAR: Cable problems reported. 17-MAR: Cable problems resolved. IRT returned to service. 17-27-MAR: Comparison with AERI indicates IRT 1-10 deg C higher; increasing error with decreasing temperatures. Probably due to dirt/debris on lens. Also, IRT calibration not valid below -50 deg C (223 K). 21-MAR: Problems with O-ring on lid sticking reported/repaired. APRIL 1994 Data values below -50 deg C (223 K) not valid - below range of calibration. Otherwise data within 2-3 degrees of AERI. 24-APR: Large (10-20 Deg C) offset between IRT and AERI develops. MAY 1994 7-MAY: Mentor visits site, observes spider's nest and dead insects inside collar attaching lid to lens barrel in optical path of instrument. Probably the source of the offset between IRT and AERI during late and April. 9-MAY: Insects removed, lens cleaned by site operations personnel. Agreement between IRT and AERI within 1 deg C. 23-MAY: Failure of lid reported. Transformer burned out. JUNE 1994 22-JUN: Rebuilt/redesigned lid mechanism put in service; data collection computer fails same day. JULY 1994 11-JUL: Computer returned to service. Agreement between IRT and AERI within 1 deg C. 22-JUL: Failure of lid reported. Transformer burned out. AUGUST 1994 3-AUG: IRT returned to service. 12-AUG: Failure of lid reported. Transformer burned out. 16-AUG: Lid mechanism abandoned. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/1994 | 0000 | 12/31/1994 | 2359 |
Subject: | SGP/MWR/C1 - Data dropouts due to serial comm problems |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | Conflicts between the drop shipper program and the MWR operation program resulted in serial communication problems which ultimately manifested as spikes and dropouts in the data. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/30/1995 | 1630 | 04/30/1995 | 1700 |
Subject: | SGP/MWR/C1 - IR thermometer calibration check |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | Mentor used an Everest model 1000 ambient temperature target (emis.=0.98) to check the calibration of the Heiman IR pyrometer (IR thermometer). Data collected during this period will be anomalous due to the modifications of the instrument settings required to facilitate the calibration. The emissivity of the instrument was changed to match the target; units were changed to deg C (from K) to match the target LCD units; integration time on the instrument was changed to 3 seconds (from 1 second). Centered the target on the instrument lens and allowed it to rest on the lens barrel so that it filled the field of view of the instrument. Both the instrument LCD and target LCD indicated 16.7 deg C. Noted that although the lens appeared clean, there was some liquid water around the edge which formed a meniscus with the inside of the lens barrel. Wiped this away with a clean, lint-free cotton cloth. Replaced the target on the lens barrel; both instrument and target then indicated 17.1 deg C. Reset the instrument emissivity (=1.0), the units (kelvins) and the integration time (=1 sec). The IRT was deployed in December 1993. Its calibration appears to have been stable since deployment. Liquid water around the edge of the lens appears to be out of the field of view and does not appear to affect the data. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1995 | 0000 | 08/20/1995 | 2359 |
08/26/1995 | 0000 | 09/04/1995 | 2359 |
07/01/1996 | 1825 | 07/23/1996 | 2300 |
Subject: | SGP/MWR/C1 - Loss of thermal stabilization |
DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | Periodically during August and September 1995 all microwave radiometers at the SGP CART generated error messages in the Site Operations Log like: Time: Sat Aug 19 18:41:20 1995 MWRLOS.C1, tkxc: Value above Maximum. This indicates that the temperature of the microwave hardware (specifically, the cross-coupler or "xc") exceeded its controlled temperature (47-52 deg C) at which point it was no longer thermally stabilized and the gain was uncontrolled. During these periods which typically last about 8 hours from about local noon until about sunset the data behave anomalously and should be considered invalid. Specifically the precipitable water vapor increases and the liquid water path decreases (and becomes SIGNIFICANTLY NEGATIVE (-0.1 mm) on clear sky days). The RMS noise level in the data also increases sharply. The 'Tkxc' field appears ONLY in the a0-level data and does NOT appear in either the a1 (mwrlos) or c1 (mwr5avg) files. Therefore THESE ANOMALOUS VALUES HAVE BEEN INCLUDED IN THE 5-MINUTE AVERAGES. The microwave hardware is thermally stabilized to about +/- 0.1 deg C by resistive heating. When the internal temperature rises above the set point the thermal stabilization of the instrument gain is lost. >From an examination of the component temperature data it appears that increasing the set point temperature to about 55 deg C (328 K) would prevent a re-ocurrance of this problem at the SGP. The manufacturer, Radiometrics, concurs that raising the set point will fix this problem and will not cause other problems. I will have to carefully examine the MCTEX data to determine whether this will be a problem for the TWP. The manufacturer and I had discussed this possibility prior to building the TWP MWRs (S/N 015, 016, and 017) and those instruments have set points above 50 deg C. Note that MWR 018 has a set point near 52 deg C (like the TWP models) but it still experienced a few loss-of-stabilization events. Note that the instruments with the lowest set points had the most loss-of-stabilization events. |
Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/09/1996 | 1337 | 04/09/1996 | 1834 |
04/10/1996 | 0625 | 04/10/1996 | 1823 |
04/11/1996 | 1149 | 04/11/1996 | 1649 |
04/12/1996 | 0917 | 04/12/1996 | 1858 |
04/13/1996 | 0605 | 04/13/1996 | 1801 |
Subject: | SGP/MWR/C1 - Radio Frequency Interference during IOP |
DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | During the specified times a strong, continuous signal was measured by the 31.4 GHz of the MWR. The signal was present in all 31.4 GHz measurements including the sky measurement, the internal reference target measurement, and the measurement of the internal noise injection source from which the instantaneous instrument gain is computed. The source of the interference has not yet been identified. Because the gain is computed using the difference of the noise injection and target measurements, and because the sky brightness temperature is computed relative to the internal target temperature, the data appear anomalous only for a period of an hour after the interference starts and ends. This is due to the low pass filter applied to the instantaneous gain. However the data should be considered invalid or at least questionable during the entire period for which the interference was present. |
Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/19/1994 | 0000 | 10/28/1996 | 1618 |
Subject: | SGP/MWR/C1 - IRT lens replaced |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The lens of the uplooking "IR thermometer" (a 10 micrometer pyrometer) was replaced on 28 October 1996 at 16:18 GMT. At the time the sky was heavily overcast (0.1-0.5 mm liquid water path, IR temperature = 281-285 K) with about 4 cm integrated water vapor. A comparison was carried out against the Atmospheric Emitted Radiance Interferometer (AERI) both prior to and subsequent to the lens change. The statistics of the differences (IRT-AERI) are as follows: Mean (K) Std Dev (K) No. Before: 0.64 0.24 122 After: 0.35 0.20 89 In addition, the downward step change in the time series plot of the temperature difference (IRT-AERI) at the time of the lens replacement is obvious. This suggests, but is not conclusive evidence, that the primary cause of the differences between the IRT and AERI reported previously (PIF no. P960809.2) may have been the weather-worn lens. However, as this instrument has not been calibrated since it was deployed in December 1993, there may also be calibration drift to contend with. Arrangements are being pursued with NREL to check the calibration of this instrument. It is preferable to carry out the IRT vs AERI comparison for clear sky conditions to be certain that both instruments are observing the same scene at the moment when they make sky measurements. However, it is not possible at this time of the year to carry out a clear sky comparison because the integrated water vapor is generally less than 2.0 cm which means that the IR temperature is less than 223 K, the lower limit of the D/A converter on the IRT. On the positive side, the AERI and the IRT are within 10 m of each other and have similar fields of view (about 2 degrees) so their scenes should be comparable for clear or cloudy skies. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/01/1996 | 0000 | 08/31/1996 | 2359 |
Subject: | SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustment |
DataStreams: | sgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1, sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | In order to correct a thermal stabilization problem identified earlier I adjusted the thermal set point of the microwave radiometers at the SGP upward from 48-50 deg C to 55 deg C in early August 1996 according to the schedule given below. B6 5 August 1996 C1 6 August 1996 B1 7 August 1996 B5 8 August 1996 Subsequent to making this adjustment the MWRs were put in TIP mode to check on whether the change in set point temperature affected their calibration. Because clear sky conditions were quite intermittent, it is difficult to determine whether the substantial variability in the tip data were attributable to the change in thermal set point. The instrument calibration was not altered in August. Tip data were again collected with these instruments in September prior to the beginning and at the close of the Water Vapor IOP. For example, the calibration of the instrument at the central facility (S/N 10) derived from the September data was essentially the same as that derived from calibration data acquired in February 1996. Although this would lead one to believe that altering the thermal set point did not affect the instrument calibration, it may be that some transient effect was induced. In comparing soundings launched from the central facility with the microwave radiometer there, I noticed that those sondes calibrated in June 1996 consistently reported lower integrated water vapor than the radiometer in July and September (during the IOP) but were in better agreement with the radiometer for the two weeks period immediately after the set point was adjusted. I suspect that adjusting the thermal set point may have temporarily increased the radiometer gain (kelvins/volt) thereby lowering the measured brightness temperature and the retrieved integrated water vapor. It is not clear why a temporary change in gain should occur or even whether it did. But users of the data should be aware that the data from the microwave radiometers at the SGP may be anomalous during August 1996. |
Measurements: | sgpmwrlosB5.a1:
sgp5mwravgC1.c1:
sgp5mwravgB6.c1:
sgpmwrlosB4.a0:
sgpmwrlosB6.a0:
sgpmwrlosC1.b1:
sgpmwrlosB1.a0:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB1.a1:
sgp5mwravgB1.c1:
sgp5mwravgB5.c1:
sgpmwrlosB5.a0:
sgp5mwravgB4.c1:
sgpmwrlosB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/03/1996 | 1937 | 12/12/1996 | 1920 |
Subject: | SGP/MWR/C1 - IRT Calibration check |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | IRT was out of service for calibration check. MWR was powered down on 96/12/03 1937-1949 to remove IRT and on 96/12/12 1848-1920 to re-install IRT. The following is from the NREL Metrology Laboratory test report of 12/10/97: Temperature Nominal Value Measured Value ----------- ------------- -------------- 0 C 273.2 K 274.1 K 10 283.2 283.6 20 293.2 293.6 30 303.2 303.2 40 313.2 313.2 In the range tested, the temperature difference is within the resolution of the instrument, so the IRT was not adjusted and the calibration factor was not changed. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/05/1997 | 0000 | 05/05/1997 | 2359 |
Subject: | SGP/MWR/C1 - IRT Calibration |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | Comparison of the uplooking IRT with AERI for 5 May 1997 during a time when the 9-11 micrometer sky temperature was in the range 220-228 K, according to AERI, the IRT indicated approximately 3 K higher. This is outside of the specified uncertainty in the IRT and indicates that the calibration needs to be revised. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/09/1997 | 1811 | 09/12/1997 | 2037 |
Subject: | SGP/MWR/C1 - IRT offline |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | The IRT was removed from the MWR to perform a comparison/calibration check prior to the Integrated IOP. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/1998 | 0000 | 04/30/1998 | 2042 |
Subject: | SGP/MWR/C1 - IRT lens replaced |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
Description: | During my recent trip to the SGP I noticed that the IRT was reading too high (about 250 K for clear sky with less than 2 cm PWV). The anti-reflective coating on the lens appeared to have deteriorated significantly. Because I observed no change in the measurements after cleaning the lens, I replaced it with the original lens which had been saved as a spare. The measured sky temperature fell to 232 K, which appeared more reasonable. The next morning I realized that I had forgotten to clean the lens after replacing it. After cleaning the IR temperature fell from 219 to 213 K with about 1.2 cm PWV. This appeared to be in agreement with Martin Platt's radiometer which measures the same passband (10 micrometers.) Upon returning to Ames, I compared the IRT with AERI for April 1998. It appears that at least as far back as 1 April the IRT data are bad. |
Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/21/1998 | 1900 | 11/12/1998 | 2200 |
Subject: | SGP/MWR/C1 - Erroneous internal temperature |
DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | After the new internal temperature sensor was installed it was discovered that the scaling resistor was incorrect. (The 24.9 kohm 0.1% resistor had accidently been replaced with a 24.0 kohm resistor when the analog board was repaired by the manufacturer several years ago.) A resistor having the correct value was installed 981112. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/03/1995 | 0000 | 10/12/1998 | 1900 |
Subject: | SGP/MWR/B1/B4/B6/C1 - software change |
DataStreams: | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0 |
Description: | The MWR operating software was changed on 12 October 1998 to provide additional functionality as described below. This change affects the format of the raw and ingested data. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated ,and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. Editor's Note: The SGP.C1 data were reprocessed in 2004 and enhancement #3 described above was applied to the data prior to Oct 1998. The SGP.BF data are queued for reprocessing as well. |
Measurements: | sgpmwrtipB1.a0:
sgpmwrlosB1.a1:
sgpmwrlosB4.a0:
sgpmwrlosB6.a0:
sgpmwrlosC1.b1:
sgpmwrtipB6.a0:
sgpmwrlosB1.a0:
sgpmwrtipB4.a0:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/19/1998 | 0053 | 11/16/1998 | 1800 |
Subject: | NSA/MWR/C1 - Software Change |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1, nsamwrtipC1.a1 |
Description: | The MWR operating software was changed on 16 November 1998 to provide additional functionality as described below. This change affects the format of the raw and ingested data. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated, and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
nsamwrtipC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/21/1993 | 1406 | 01/12/1999 | 2359 |
Subject: | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) |
DataStreams: | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
Description: | At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made operational at the SGP central facility (C1). No problems were noted over the next few days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 January. This version includes a beam width correction I developed as well as providing the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not executing the system command to move and rename the data files so that the ARM data system could retrieve them. Reducing the length of the storage arrays in the auto-leveling feature from 1000 to 250 resolved the problem. This results in the auto-leveling being based on only 4 hours of clear sky data rather than 16 hours at B5 and C1. This version of the program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these computers are upgraded to Pentium-class machines. The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. The goodness-of-fit coefficient for the tip curves has improved from about 0.995 to over 0.998. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all time. The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, but the data prior to that range did not have these corrections applied. |
Measurements: | sgpmwrtipB1.a0:
sgpmwrlosB5.a1:
sgpmwrtipB5.a0:
sgpmwrlosB1.a1:
sgpmwrlosC1.b1:
sgpmwrtipB6.a0:
sgpmwrtipB4.a0:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/09/1998 | 0500 | 06/09/1998 | 2345 |
Subject: | NSA/MWR/C1 - Spikes in PWV data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | The PWV data began exhibiting a pattern of large (~5 cm) spikes which exponetially degrade to normal values. The problem is due to a fault in the serial or fiber optic data communication. This pattern began intermittent occurrence on 4/9/98 but it dominates the data by 5/1/98. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/15/1998 | 1900 | 11/21/1998 | 1825 |
Subject: | NSA/MWR/C1 - Spikes in PWV data |
DataStreams: | nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | After reinstallation of repaired MWR #20, PWV data began exhibiting a pattern of large (~5 cm) spikes which exponetially degrade to normal values. The problem was due to a fault in the serial or fiber optic data communication. This pattern began intermittant ocurrance on 8/15/98 but it dominates the data by 9/6/98. |
Measurements: | nsamwrlosC1.a1:
nsamwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/09/1998 | 2345 | 07/07/1998 | 1800 |
Subject: | NSA/MWR/C1 - Reprocess: incorrect calibrations |
DataStreams: | nsamwrlosC1.00, nsamwrlosC1.a1, nsamwrlosC1.b1 |
Description: | MWR #17 was placed in service while MWR #20 was being repaired by the manufacturer. The data need to be reprocessed with calibration coefficients appropriate for this instrument. |
Measurements: | nsamwrlosC1.00:
nsamwrlosC1.a1:
nsamwrlosC1.b1:
|