DQR ID | Subject | Data Streams Affected |
---|---|---|
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 |
D030312.6 | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | nsamwrlosC1.a1, nsamwrlosC1.b1 |
D030822.7 | NSA/MWR/C1 - min/max/delta values incorrect | nsamwrlosC1.b1 |
D060420.8 | NSA/MWR/C1 - software upgrade (version 3.28) | 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 |
---|---|---|---|
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 |
---|---|---|---|
01/02/1998 | 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 |
---|---|---|---|
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:
|