DQR ID | Subject | Data Streams Affected |
---|---|---|
D051229.5 | NIM/MFRSR/M1 - Instrument not shading properly | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
D060112.4 | NIM/SKYRAD/M1 - IRTs do not agree with AERI | nimskyrad60sM1.b1 |
D060222.1 | NIM/SKYRAD/M1 - Instrument ventilator problem | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
D060307.1 | NIM/MWRP/M1 - Software problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060419.3 | NIM/MWRP/M1 - Instrument noise problem | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060419.4 | NIM/MWR/M1 - Instrument noise problem/RF interference | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060420.5 | NIM/MWRP/M1 - IRT Sensor Calibration | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060602.2 | NIM/MWRP/M1 - Reprocessed: IRT configuration setting error | nimmwrpM1.b1 |
D060619.1 | NIM/MWRP/M1 - Reprocessed - New retrieval coefficients | nimmwrpM1.b1 |
D060630.41 | NIM/SKYRAD/M1 - Reprocess: Longwave Calibration error | nimskyrad60sM1.b1 |
D060630.42 | NIM/GNDRAD/M1 - Reprocessed: Longwave calibration error | nimgndrad60sM1.b1 |
D060713.1 | NIM/MWRP/M1 - 51.25 GHz channel calibration drifted | nimmwrpM1.b1 |
D060718.1 | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. | nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060906.1 | NIM/MFRSR/S1 - Shading problem | nimmfrsrS1.a0, nimmfrsrS1.b1 |
D060915.1 | NIM/SKYRAD/M1 - Unknown problem with PIR1 | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
D060927.1 | NIM/MWR/M1 - Sun in field of view of radiometer | nimmwrlosM1.b1 |
D060929.1 | NIM/MWRP/M1 - Sun in radiometer's field of view | nimmwrpM1.b1 |
D061003.3 | NIM/MWRP/M1 - IRTs do not agree with AERI | nimmwrpM1.b1 |
D061003.4 | NIM/AERI/M1 - IRTs do not agree with AERI | nimaerisummaryM1.b1 |
D061006.1 | NIM/SKYRAD/M1 - Tracker inoperative | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
D061107.1 | NIM/MFRSR/M1 - Shading problem | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
D061117.1 | NIM/MWRP/M1 - Reprocessed: K-band calibration drift corrected | nimmwrpM1.b1 |
D070203.1 | NIM/GNDRAD/M1 - Station setup and troubleshooting | nimgndradM1.00, nimgndrad20sM1.a0, nimgndrad60sM1.b1 |
D070203.2 | NIM/SKYRAD/M1 - station setup and troubleshooting | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/25/2005 | 1500 | 02/01/2006 | 1130 |
Subject: | NIM/MFRSR/M1 - Instrument not shading properly |
DataStreams: | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
Description: | Shadowband not shading properly between 0830 and 1500. Do not use diffuse or direct data in this range. Maintenance on 2/1/2006 resolved the problem. |
Measurements: | nimmfrsrM1.00:
nimmfrsrM1.a0:
nimmfrsrM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/26/2005 | 0000 | 06/07/2006 | 1900 |
Subject: | NIM/SKYRAD/M1 - IRTs do not agree with AERI |
DataStreams: | nimskyrad60sM1.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 measureed 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. It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT. |
Measurements: | nimskyrad60sM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/23/2005 | 0000 | 02/23/2006 | 0800 |
Subject: | NIM/SKYRAD/M1 - Instrument ventilator problem |
DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
Description: | Data quality office first reported that PIR1 and PIR2 appear to be deviating more than typical during the daylight hours. It was found that the Skyrad PIR ventilator fans were building up debris on the intake air filter. Obstructed air flow results in solar heating of the PIR ventilator housing in the later part of the day and biasing the incomming IR irradiance values. The slow buildup was insidious and wasn't discovered and corrected (i.e. ventilator fans cleaned on a regular and frequent basis) until Feb 23rd. On or around December 23rd was when this problem may have first started. We are unable to quantify the extent of the problem in W/m2. Normal deviation between PIRs is typically 3-5 W/m2. |
Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|
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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
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 |
---|---|---|---|
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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
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 |
---|---|---|---|
11/26/2005 | 1500 | 12/22/2005 | 1100 |
Subject: | NIM/SKYRAD/M1 - Reprocess: Longwave Calibration error |
DataStreams: | nimskyrad60sM1.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in December 2003. These modified procedures introduced a calibration bias in the longwave data. The previous procedures were re-implemented at all sites between December 2005 and February 2006 to restore proper calibrations. The data collected while the incorrect procedures were in place are being reprocessing to remove the calibration bias. Note, this also affected standard deviation, maximum and minimum data fields. |
Measurements: | nimskyrad60sM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/25/2005 | 1700 | 12/22/2005 | 1100 |
Subject: | NIM/GNDRAD/M1 - Reprocessed: Longwave calibration error |
DataStreams: | nimgndrad60sM1.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in December 2003. These modified procedures introduced a calibration bias in the longwave data. The previous procedures were re-implemented at all sites between December 2005 and February 2006 to restore proper calibrations. The data collected while the incorrect procedures were in place have been reprocessed to remove the calibration bias. The reprocessed 60 second averaged data are based on 3 instantaneous 20 second data records rather than on 60 1 second instantaneous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in February 2007. |
Measurements: | nimgndrad60sM1.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 |
---|---|---|---|
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 |
---|---|---|---|
07/01/2006 | 0000 | 10/25/2006 | 2359 |
Subject: | NIM/MFRSR/S1 - Shading problem |
DataStreams: | nimmfrsrS1.a0, nimmfrsrS1.b1 |
Description: | A shading problem was first noticed in Aug data. Subsequent careful examination of prior data indicate it may have begun in early July. Because of the near constant dusty conditions, it is difficult to determine exactly when it started. As such a loose start date of 7/1/2006 is given to this DQR. There is reasonable evidence of shading issues in the second half of July. The hours in question are between 1430 and 1700 UTC. Mentor suggests avoiding data during these hours. Maintenance on 10/25 resolved the problem. |
Measurements: | nimmfrsrS1.a0:
nimmfrsrS1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/02/2006 | 0000 | 09/19/2006 | 0745 |
Subject: | NIM/SKYRAD/M1 - Unknown problem with PIR1 |
DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
Description: | Spikes in Shaded 1 occur frequently during this time period, resulting in differences b/t shaded1 and shaded2 exceeding 20W/m2. Instrument connections were checked and a spare PIR instrument was tried in the place of PIR1 (shaded1). After returning the original PIR1 to its original location data again looked good and very close to PIR2. Problem appears resolved but exact cure is unknown. |
Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|
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 |
---|---|---|---|
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 |
---|---|---|---|
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. It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT. |
Measurements: | nimmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/07/2006 | 0009 | 06/07/2006 | 1900 |
Subject: | NIM/AERI/M1 - IRTs do not agree with AERI |
DataStreams: | nimaerisummaryM1.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. It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT. |
Measurements: | nimaerisummaryM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/12/2006 | 1200 | 10/05/2006 | 1330 |
Subject: | NIM/SKYRAD/M1 - Tracker inoperative |
DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
Description: | Starting on 9/12 the NIM radiometer tracker drifted enough due to sinking supports and a drifting clock that the direct normal measurments (NIP) and the downwelling hemispheric diffuse shortwave measurments (8-48) were adversely affected in the afternoon hours. The shortwave hemispheric global instrument (PSP) and downelling hemispheric longwave shaded1 and shaded2 (PIR) are unaffected by this problem. The tracker problem greatly affected direct measurements and affected the diffuse measurement to a lesser extent. There are no redundant measurements for these instruments. However, during this time range the data collected before local noon (aprox 1140GMT) for all shortwave Skyrad instruments appear to be good. |
Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/01/2006 | 0000 | 11/27/2006 | 1200 |
Subject: | NIM/MFRSR/M1 - Shading problem |
DataStreams: | nimmfrsrM1.00, nimmfrsrM1.a0, nimmfrsrM1.b1 |
Description: | The start time for this shading problem is very loose. Due to the near constant dusty conditions, it is very difficult to ascertain exactly when a shading problem begins. There are subtle hints of it in early to mid Oct, but it isn't until the end of the month when we can say with some certainty that there is a shading issue. Maintenance on 11/27/2006 resolved the problem. |
Measurements: | nimmfrsrM1.00:
nimmfrsrM1.a0:
nimmfrsrM1.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 |
---|---|---|---|
11/24/2005 | 0000 | 12/01/2005 | 1400 |
Subject: | NIM/GNDRAD/M1 - Station setup and troubleshooting |
DataStreams: | nimgndradM1.00, nimgndrad20sM1.a0, nimgndrad60sM1.b1 |
Description: | This station was collecting data for the first time at this location - There were multiple instrument setup problems (PIR cabling, IRT setup)that were being corrected during this time. Radiometer data is unreliable during this period. |
Measurements: | nimgndradM1.00:
nimgndrad20sM1.a0:
nimgndrad60sM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/26/2005 | 0000 | 12/13/2005 | 1045 |
Subject: | NIM/SKYRAD/M1 - station setup and troubleshooting |
DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
Description: | This station was collecting data for the first time at this location - There were multiple instrument setup problems (PIR cabling, IRT setup, tracker operation)that were being corrected during this time. Radiometer data is unreliable during this period. |
Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|