DQR ID | Subject | Data Streams Affected |
---|---|---|
D041027.1 | NSA/MWRP/C1 - Missing data | nsamwrpC1.b1 |
D060307.1 | NIM/MWRP/M1 - Software problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060321.3 | NIM/SONDE/M1 - RH data incorrect. | nimsondewnpnM1.b1 |
D060419.3 | NIM/MWRP/M1 - Instrument noise problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060419.5 | NSA/MWRP/C1 - Incorrect calibration | nsamwrpC1.b1 |
D060420.5 | NIM/MWRP/M1 - IRT Sensor Calibration | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060427.2 | NSA/MWRP/C1 - Bad calibration values | nsamwrpC1.00, nsamwrpC1.b1, nsamwrprawC1.00 |
D060602.2 | NIM/MWRP/M1 - Reprocessed: IRT configuration setting error | nimmwrpM1.b1 |
D060619.1 | NIM/MWRP/M1 - Reprocessed - New retrieval coefficients | nimmwrpM1.b1 |
D060713.1 | NIM/MWRP/M1 - 51.25 GHz channel calibration drifted | nimmwrpM1.b1 |
D060803.2 | NSA/SONDE/C1 - Noisy/Unstable RH and dew point data | nsasondewnpnC1.b1 |
D060811.1 | NSA/SONDE/C1 - Bad surface RH and temperature values | nsasondewnpnC1.b1 |
D060928.1 | NSA/SONDE/C1 - RH values offset due to error in ground check | nsasondewnpnC1.b1 |
D060928.4 | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry | nsasondewnpnC1.b1 |
D060929.1 | NIM/MWRP/M1 - Sun in radiometer's field of view | nimmwrpM1.b1 |
D060929.2 | NSA/MWRP/C1 - Reprocessed: Re-calibration | nsamwrpC1.b1 |
D061003.3 | NIM/MWRP/M1 - IRTs do not agree with AERI | nimmwrpM1.b1 |
D061011.1 | NSA/SONDE/C1 - Incorrect surface values of T and RH | nsasondewnpnC1.b1 |
D061114.3 | NSA/SONDE/C1 - RH sensor failure | nsasondewnpnC1.b1 |
D061117.1 | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected | nimmwrpM1.b1 |
D061205.3 | NSA/MWRP/C1 - Reprocessed: K-Band calibration drift | nsamwrpC1.b1 |
D070124.1 | NSA/SONDE/C1 - Incorrect surface RH value | nsasondewnpnC1.b1 |
D070709.1 | NSA/MWRP/C1 - Reprocessed: 6-channel retrieval replaced by 5-channel retrieval | nsamwrpC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/21/2004 | 0925 | 02/23/2004 | 2238 |
10/07/2004 | 0859 | 10/27/2004 | 1237 |
11/20/2004 | 0039 | 11/22/2004 | 1851 |
04/10/2005 | 0000 | 04/11/2005 | 1622 |
09/04/2005 | 0531 | 09/06/2005 | 1857 |
09/10/2005 | 0052 | 09/12/2005 | 1830 |
09/21/2005 | 1805 | 10/12/2005 | 2311 |
06/23/2006 | 1800 | 08/08/2006 | 2250 |
08/11/2006 | 2359 | 08/14/2006 | 1454 |
10/09/2006 | 2101 | 10/11/2006 | 1733 |
01/05/2007 | 2358 | 01/08/2007 | 2019 |
02/28/2007 | 2309 | 03/05/2007 | 0027 |
07/13/2007 | 1838 | 12/08/2007 | 0125 |
01/04/2008 | 2357 | 01/06/2008 | 1903 |
02/16/2008 | 1818 | 02/21/2008 | 0006 |
02/23/2008 | 1005 | 02/26/2008 | 2320 |
03/12/2008 | 0143 | 04/09/2008 | 1540 |
04/10/2008 | 1840 | 04/14/2008 | 1657 |
04/18/2008 | 2258 | 04/21/2008 | 1422 |
04/27/2008 | 1846 | 04/29/2008 | 0525 |
05/01/2008 | 0328 | 05/28/2008 | 2241 |
10/14/2008 | 1659 | 02/13/2009 | 2234 |
02/01/2011 | 1800 | 04/04/2011 | 1300 |
04/09/2011 | 0000 | 04/11/2011 | 1400 |
Subject: | NSA/MWRP/C1 - Missing data |
DataStreams: | nsamwrpC1.b1 |
Description: | Data are missing and unrecoverable. |
Measurements: | nsamwrpC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/28/2006 | 1100 | 03/07/2006 | 1615 |
Subject: | NIM/MWRP/M1 - Software problem |
DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
Description: | The MWRP computer failed and it was cloned with a new Gx620. Soon after, the MWRP program started to crash and was intermittent. Data were lost on March 3, 4, 5. On March 7 the program was forcefully ended and restarted. This appears to have cleared the problem. The instrument has been running since. |
Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/11/2006 | 0500 | 03/11/2006 | 0501 |
Subject: | NIM/SONDE/M1 - RH data incorrect. |
DataStreams: | nimsondewnpnM1.b1 |
Description: | RH% values oscillate between ambient values and 0%. The 0% RH values are incorrect. |
Measurements: | nimsondewnpnM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2006 | 0000 | 01/08/2007 | 0000 |
Subject: | NIM/MWRP/M1 - Instrument noise problem |
DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
Description: | There are spikes and elevated noise in MWRP data. The origine of the spikes is RF interference from various sources. All brightness temperatures are affected, but in particular the 5 K-band channels. LWP retrievals are noisy and affected by spikes as a result. |
Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/12/2006 | 1800 | 04/13/2006 | 2000 |
Subject: | NSA/MWRP/C1 - Incorrect calibration |
DataStreams: | nsamwrpC1.b1 |
Description: | On 4/12 a calibration was attempted but the calibration was not successful. A new calibration was completed on 4/13 20:00 UTC. Data between the two calibration attempts are incorrect and should be disregarded. |
Measurements: | nsamwrpC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2006 | 0000 | 06/03/2006 | 0000 |
Subject: | NIM/MWRP/M1 - IRT Sensor Calibration |
DataStreams: | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
Description: | Discrepancies between the MWRP and Skyrad IRT were observed in January. The MWRP IRT readings were constantly higher than those of the skyrad IRT. Some changes were introduced to the MWRP IRT to address the problem (see DQR D060602.2). On May 3, the IRT mirror was replaced. After the change in the mirror, the MWRP IRT readings became about 5-8 C lower. On June 3 the agreement between MWRP and Skyrad IRT became satisfactory (2-5 degree C difference). It is hard to numerically quantify the difference in the IRT readings caused by the change in the mirror. We can only warn the user that between January 1 and June 3 the MWRP readings are 8 to 15 degree higher than the skyrad IRT. |
Measurements: | nimmwrpM1.00:
nimmwrpM1.b1:
nimmwrprawM1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/26/2006 | 1930 | 04/27/2006 | 1530 |
Subject: | NSA/MWRP/C1 - Bad calibration values |
DataStreams: | nsamwrpC1.00, nsamwrpC1.b1, nsamwrprawC1.00 |
Description: | After calibration was completed on 4/26/2006 the last value in the V-band calibration file was corrupted. V-band data are wrong between 4/26 19:30 and 4/27 15:27 when the corrupted values were removed. |
Measurements: | nsamwrprawC1.00:
nsamwrpC1.b1:
nsamwrpC1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2006 | 0000 | 04/21/2006 | 0000 |
Subject: | NIM/MWRP/M1 - Reprocessed: IRT configuration setting error |
DataStreams: | nimmwrpM1.b1 |
Description: | The infrared thermometer settings (IRT) were not configured as specified by the manufacturer. The analog output was set to a range of -60 to +50 C (0-10V) instead of -50 to +50 C (0-10V). The settings were changed on April 20. The IR temperatures should be slightly smaller than reported. The data have been reprocessed to correct the IRT calibrations. Reprocessed data were archived in August 2006. |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2006 | 0000 | 08/24/2006 | 2300 |
Subject: | NIM/MWRP/M1 - Reprocessed - New retrieval coefficients |
DataStreams: | nimmwrpM1.b1 |
Description: | Occasionally, the retrieved relative humidity was exceeding 120%. Upon reviewing the data it was noticed that the high values were appearing in the highest layers (above 8 km) and especially during spring season. Since retrievals at the highest levels are mainly affected by the climatology used to constrain the retrievals, we reviewed the statistical coefficients that were used to retrieve temperature and humidity. It was discovered that, in the training dataset (radiosonde), there were a few outliers (invalid radiosonde soundings) that had escaped the screening process and were affecting the computations of the retrieval coefficients. We recomputed the retrieval coefficients with the newly screened set of radiosonde data and reprocessed all the previous data at Niamey. The reprocessed data were archived in August 2006. The new coefficients improve temperature and humidity profiles in two ways. The relative humidity will not exceed 120% in the upper layers and the temperature profiles will be in better agreement with the sonde in the first 4 km. |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/05/2006 | 0000 | 01/08/2007 | 0000 |
Subject: | NIM/MWRP/M1 - 51.25 GHz channel calibration drifted |
DataStreams: | nimmwrpM1.b1 |
Description: | After a power outage on May 5 the 51.25 GHz had a slight change in the calibration. The resulting LWP computed by using all 6 channels increased of about 0.025 mm (25 g/m2). |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/31/2006 | 0515 | 07/31/2006 | 0523 |
Subject: | NSA/SONDE/C1 - Noisy/Unstable RH and dew point data |
DataStreams: | nsasondewnpnC1.b1 |
Description: | The RH readings during the first 8 minutes of this sounding include three apparently incorrect oscillations to near-zero values. After checking the absolutely raw data, it seems as though this period was excessively noisy, resulting in many missing values. The noise abatted and the remaining sounding values are valid. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/30/2006 | 0522 | 07/30/2006 | 0523 |
08/01/2006 | 0520 | 08/01/2006 | 0521 |
08/04/2006 | 0532 | 08/04/2006 | 0533 |
08/06/2006 | 0528 | 08/06/2006 | 0529 |
08/08/2006 | 0517 | 08/08/2006 | 0518 |
08/09/2006 | 0527 | 08/09/2006 | 0528 |
08/11/2006 | 0525 | 08/11/2006 | 0526 |
08/15/2006 | 0534 | 08/15/2006 | 0535 |
08/17/2006 | 0535 | 08/17/2006 | 0536 |
08/18/2006 | 0516 | 08/18/2006 | 0517 |
08/19/2006 | 0538 | 08/19/2006 | 0539 |
08/19/2006 | 1745 | 08/19/2006 | 1746 |
08/20/2006 | 0532 | 08/20/2006 | 0533 |
08/20/2006 | 1729 | 08/20/2006 | 1730 |
08/21/2006 | 0530 | 08/21/2006 | 0531 |
08/22/2006 | 0524 | 08/22/2006 | 0525 |
Subject: | NSA/SONDE/C1 - Bad surface RH and temperature values |
DataStreams: | nsasondewnpnC1.b1 |
Description: | This is a subtle problem that might escape notice. For the identified sonde launches, the ground station lost its signal between the time it was removed from the ground check set and the time it was launched. As a result, the software, which automatically determines the launch time and surface conditions at time of launch mistakenly used values of temperature and RH representative of the ground check set and the GW rather than of the ambient conditions before launch. The bad values influenced only the first few samples and the remainder of the sounding values are correct. A procedural problem was identified and corrected. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/2006 | 0532 | 09/26/2006 | 2359 |
Subject: | NSA/SONDE/C1 - RH values offset due to error in ground check |
DataStreams: | nsasondewnpnC1.b1 |
Description: | Background: After installation of the latest software update , we began performing formal ground checks on RS92 radiosondes. By comparing the radiosonde readings with reference values in a controlled environment, the ground check is intended to ensure that the radiosonde sensors are in calibration before launch. The radisonde values during the ground check process are recorded automatically; the reference values are entered by the operator. If the radiosonde readings vary from the reference values, the system 'corrects' the radiosonde values. In the case of RH, the correction is applied as an offset (true RH = indicated RH + correction). Problem: Some operators misunderstood the ground-check procedure and entered the radiosonde values of RH rather than the reference value (assumed 0%RH), thus, some soundings done during this period have RH values that are different from what they would be if the ground check procedure had been done correctly. Consequence: Because the RH corrections generally are small (averaging about 0.5% RH) and the precision of the reported RH data during this time period is 1% RH, some values will not be affected at all; others will be off by about 1% RH (still within the stated accuracy of the sensor). Furthermore, because entering the radiosonde value as the reference value results in a near zero 'correction,' one may view these soundings as being done without the ground check correction. Also note that the dew point value will be suspect as well. I am attaching below a listing of the soundings that were affected during the indicated time period. Users can see the magnitude of the problem and choose whether or not to apply an offset in RH. Note that application of the offset to the processed RH data (in the netCDF file) will not have the same effect of applying the correction to the absolutely raw data (before processing), but the differences should be insignificant. Also note that the corrections for each sounding are included in the netCDF header information. These attributes are named 'humidity_correction' and 'humidity_correction_2'. The values of RH indicated by the radiosonde while it is in the ground check set are in attributes 'humidity_gc_sonde' and 'humidity_gc_sonde_2.' There is an RH reading for each of the two RH sensors used in the RS92 radiosonde. Here is the list - RH1 and RH2 are the radiosonde readings in the ground check set. Ref is the reference value entered by the operator. The correcte reference value should be 0%. To obtain an approximation to the RH value that would have been recorded if the ground check had been done properly, subtract the Ref value from the indicated RH. YYYYMMDD HHMM SerialNo RH1 RH2 Ref 20060713 0532 B1924431 0.30 0.20 0.30 20060713 1751 B1854963 0.20 0.30 0.30 20060714 0521 B1924425 0.40 0.40 0.40 20060714 1739 B1854206 0.30 0.30 0.30 20060715 0522 B1715127 1.20 1.20 1.20 20060715 1737 B1854966 0.60 0.60 0.60 20060716 0508 B1715126 0.40 0.40 0.40 20060716 1732 B1844098 0.50 0.50 0.50 20060717 0517 B1914170 0.40 0.40 0.40 20060718 0516 B1914173 0.70 0.70 0.70 20060720 0523 B1854149 0.40 0.40 0.40 20060721 0517 B1914153 0.40 0.40 0.40 20060722 0521 B1844097 1.00 1.10 1.10 20060722 1730 B1914174 0.60 0.70 0.70 20060723 0537 B1714439 0.40 0.40 0.40 20060723 1734 B1734155 0.50 0.50 0.50 20060724 0529 B1134336 0.50 0.50 0.50 20060725 0525 B1754099 0.60 0.70 0.70 20060726 0541 B1844108 1.80 1.80 1.80 20060727 0520 B1714382 0.70 0.80 0.70 20060728 0531 B1854116 0.80 0.80 0.80 20060729 0527 B1724027 1.00 1.00 1.00 20060729 1726 B1714392 0.70 0.80 0.80 20060730 0522 B1854100 0.70 0.80 0.80 20060730 1724 B1854764 0.90 1.00 1.00 20060731 0515 B1664086 0.90 0.80 0.90 20060801 0520 B1724758 1.50 1.50 1.50 20060801 1729 B1754116 1.10 1.10 1.10 20060802 0518 B1724516 0.80 0.80 0.80 20060803 0523 B1674148 0.80 0.80 0.80 20060804 0532 B1754092 0.90 0.90 0.90 20060804 1727 B1844117 3.50 3.50 3.50 20060805 0531 B1714741 0.30 0.30 0.30 20060805 1728 B1754098 0.30 0.30 0.30 20060806 0528 B1844115 0.40 0.40 0.40 20060806 1728 B1914161 0.20 0.20 0.20 20060807 0530 B1714549 0.30 0.30 0.30 20060808 0517 B1844107 0.50 0.50 0.50 20060808 1744 B1914166 0.20 0.20 0.20 20060809 0527 B1914164 0.30 0.40 0.40 20060809 1736 B1914163 0.30 0.30 0.30 20060810 0521 B1914160 0.40 0.50 0.50 20060810 1745 B1744671 0.40 0.40 0.40 20060811 0525 B1854965 0.50 0.50 0.50 20060811 1753 B1724131 0.10 0.10 0.10 20060812 0527 B1754104 0.50 0.50 0.50 20060812 1740 B1854256 0.30 0.40 0.40 20060813 0522 B1854240 0.30 0.40 0.40 20060814 0525 B1714106 0.20 0.20 0.20 20060814 1742 B1854106 0.40 0.40 0.40 20060815 0534 B1914169 0.50 0.60 0.60 20060815 1734 B1854233 0.60 0.70 0.70 20060816 0539 B1724791 0.20 0.20 0.20 20060816 1732 B1914171 0.10 0.20 0.20 20060817 0535 B1354283 0.10 0.10 0.10 20060817 1740 B1354574 0.40 0.40 0.40 20060818 0516 B1354633 0.50 0.40 0.50 20060818 1744 B1364673 0.20 0.20 0.20 20060819 0538 B1364126 0.20 0.30 0.30 20060819 1745 B1354598 0.50 0.60 0.60 20060820 0532 B1354290 1.10 1.10 1.10 20060820 1729 B1354317 0.40 0.40 0.40 20060821 0530 B1354545 0.60 0.70 0.70 20060821 1728 B1354516 0.70 0.70 0.70 20060822 0524 B1354619 0.50 0.60 0.60 20060822 1728 B1364377 0.40 0.40 0.40 20060823 0533 B1354309 0.30 0.30 0.30 20060823 1730 B1354527 0.70 0.70 0.70 20060824 0533 B1354230 0.60 0.60 0.60 20060824 1812 B1354587 0.70 0.70 0.70 20060825 0517 B1354614 0.70 0.70 0.70 20060825 1730 B1354630 0.60 0.60 0.60 20060826 0537 B1334114 0.90 0.90 0.90 20060826 1734 B1354246 0.70 0.70 0.70 20060827 0508 B1354534 0.70 0.70 0.70 20060827 1729 B1354618 0.60 0.60 0.60 20060828 0517 B1354115 0.40 0.40 0.40 20060828 1738 B1354206 0.50 0.60 0.60 20060829 0516 B1354617 0.50 0.60 0.60 20060829 1717 B1354622 0.50 0.60 0.60 20060830 0511 B1354314 0.40 0.50 0.50 20060830 1732 B1354537 0.60 0.70 0.70 20060831 1802 B1354239 0.60 0.80 0.80 20060905 1724 B1354626 0.60 0.60 0.60 20060906 0522 B1354525 0.60 0.80 0.80 20060906 1734 B1354107 0.50 0.50 0.50 20060907 0537 B1354543 0.70 0.70 0.70 20060907 1803 B1354586 0.80 0.80 0.80 20060908 0531 B1354519 0.60 0.60 0.60 20060908 1728 B1354224 0.60 0.60 0.60 20060909 0534 B1354532 0.70 0.80 0.80 20060909 1732 B1354513 0.80 0.90 0.90 20060910 0516 B1354125 0.60 0.70 0.60 20060910 1727 B1354110 0.40 0.50 0.50 20060911 0528 B1354235 0.90 0.90 0.90 20060911 1849 B1354514 0.70 0.70 0.70 20060912 0525 B1354124 0.60 0.70 0.70 20060913 0534 B1344478 0.50 0.50 0.50 20060914 0520 B1354226 0.70 0.70 0.70 20060915 0529 B1344459 0.40 0.50 0.50 20060916 0532 B1344469 0.50 0.40 0.50 20060916 1732 B1354106 0.50 0.60 0.60 20060917 0527 B1354210 0.70 0.70 0.70 20060918 0533 B1354087 0.60 0.60 0.60 20060919 0526 B1354097 0.70 0.50 0.60 20060920 0516 B1344462 0.50 0.40 0.50 20060920 1810 B1354536 0.70 0.70 0.70 20060921 0534 B1354112 0.50 0.60 0.60 20060921 1800 B1344502 0.40 0.40 0.40 20060922 0525 B1354531 0.70 0.80 0.80 20060922 1736 B1354541 0.70 0.70 0.70 20060923 0519 B1354101 0.50 0.60 0.60 20060923 1738 B1354576 0.70 0.50 0.70 20060924 0536 B1354095 0.60 0.60 0.60 20060925 0536 B1354098 0.60 0.60 0.60 20060925 1755 B1354100 0.50 0.50 0.50 20060926 0531 B1334691 0.70 0.70 0.70 20060926 1742 B1354108 0.40 0.50 0.50 |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/2006 | 0500 | 12/31/9999 | 2359 |
Subject: | NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry |
DataStreams: | nsasondewnpnC1.b1 |
Description: | The output precision of the following variables was increased 20060929: alt changed from 1m to 0.1m dp changed from 0.1degC to 0.01degC pres changed from 0.1 hPa to 0.01 hPa RH changed from 1%RH to 0.01%RH tdry changed from .1degC to 0.01degC Note that the increase in precision does not necessarily imply an increase in accuracy. Users are cautioned to continue to use their best scientific judgement when using these or any other data. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/01/2006 | 0000 | 08/31/2006 | 2359 |
Subject: | NIM/MWRP/M1 - Sun in radiometer's field of view |
DataStreams: | nimmwrpM1.b1 |
Description: | Around noon local time every day there is a spike in the brightness temperature data. This is due to the sun being in the field of view of the radiometer. PWV and LWP are affected as a consequence |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/08/2006 | 2200 | 09/06/2006 | 2150 |
Subject: | NSA/MWRP/C1 - Reprocessed: Re-calibration |
DataStreams: | nsamwrpC1.b1 |
Description: | After being re-installed the radiometer was calibrated with liquid nitrogen. Data between 8/8 and 9/6 have been reprocessed to apply the revised calibrations. |
Measurements: | nsamwrpC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/09/2006 | 0001 | 06/07/2006 | 1900 |
Subject: | NIM/MWRP/M1 - IRTs do not agree with AERI |
DataStreams: | nimmwrpM1.b1 |
Description: | Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky temperatures than the AERI and the MWRP IRT measured about 20K higher than the AERI. Several actions were taken to diagnose the problem including confirming the correct configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror. After several days of rain beginning 6/2/2006, the three instruments came into agreement. The cause of the discrepancy was probably dust accumulation on the lens of the instrument |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/07/2006 | 0524 | 10/07/2006 | 0525 |
Subject: | NSA/SONDE/C1 - Incorrect surface values of T and RH |
DataStreams: | nsasondewnpnC1.b1 |
Description: | The radiosonde was launched too quickly after being removed from the ground check set. As a result, the system did not equilibrate with the local ground conditions and the automatically entered surface values are incorrect. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/28/2006 | 0532 | 10/28/2006 | 0710 |
Subject: | NSA/SONDE/C1 - RH sensor failure |
DataStreams: | nsasondewnpnC1.b1 |
Description: | It appears that one of the two RH sensors on this radiosonde was affected by ice after emerging from a low cold cloud. As a result the reported RH values oscillate by about 10 percent until the alternate heating cycle stops. I suspect the lower value is more close to correct, but can't be absolutely sure. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/01/2006 | 0000 | 11/17/2006 | 1713 |
Subject: | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected |
DataStreams: | nimmwrpM1.b1 |
Description: | During October and November there was a drift in the K-Band calibration of the MWRP. This resulted in brightness temperatures that were too high. New calibration coefficients were derived from the median value of the noise diode temperature for the months of October and November and the data were reprocessed to apply the corrected calibrations. The reprocessed data were archived in January 2007. |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/01/2006 | 0000 | 11/27/2006 | 2100 |
Subject: | NSA/MWRP/C1 - Reprocessed: K-Band calibration drift |
DataStreams: | nsamwrpC1.b1 |
Description: | At the beginning of November, the K-band channel calibration started to drift. The MWRP brightness temperatures were about 1.5 K higher than the MWR-measured brightness temperatures. By the half of the month the differences were more than 2 K to become about 4 K by the end of November. On Nov 27 new calibration coefficients were derived and uploaded. Data for 20061101-20061127 have been reprocessed with the revised calibrations and are available from the ARM Archive effective January 2007. |
Measurements: | nsamwrpC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/29/2006 | 0517 | 12/29/2006 | 0518 |
Subject: | NSA/SONDE/C1 - Incorrect surface RH value |
DataStreams: | nsasondewnpnC1.b1 |
Description: | For an unknown reason the surface RH was reported a 0%. Becuase these values are entered automatically by the system, this is NOT likely an operator error. Examination of the raw data shows that the surface RH at launch time was approximately 81.2 %RH. |
Measurements: | nsasondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/19/2004 | 0214 | 06/02/2007 | 2359 |
Subject: | NSA/MWRP/C1 - Reprocessed: 6-channel retrieval replaced by 5-channel retrieval |
DataStreams: | nsamwrpC1.b1 |
Description: | Due to repeated failure of the V-band receiver and calibration problems, the 6-channel retrieval was retired and a new 5-channel retrieval which uses only the K-band channels was implemented. All data previously processed with the 6-channel retrieval have been reprocessed. Please note that the 7 channels (brightness temperatures) in the V-band range (51 to 60 GHz) should not be used. See D080331.1 and D080331.2. |
Measurements: | nsamwrpC1.b1:
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