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 |
D060221.1 | NIM/MPL/M1 - False Positive Cloud Base Height Values During Solar Noon | nimmplM1.00, nimmplM1.a1 |
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 |
D060321.3 | NIM/SONDE/M1 - RH data incorrect. | nimsondewnpnM1.b1 |
D060407.1 | NIM/MET/M1 - Software problem | nimmetM1.b1 |
D060420.5 | NIM/MWRP/M1 - IRT Sensor Calibration | nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00 |
D060524.2 | NIM/MET/M1 - Optical Rain Gauge Failure | nimmetM1.b1 |
D060602.2 | NIM/MWRP/M1 - Reprocess: IRT configuration setting error | nimmwrpM1.b1 |
D060630.41 | NIM/SKYRAD/M1 - Reprocess: Longwave Calibration error | nimskyrad60sM1.b1 |
D060630.42 | NIM/GNDRAD/M1 - Reprocess: Longwave Calibration error | nimgndrad60sM1.b1 |
D060817.1 | NIM/MET/M1 - Reprocess: Barometric Data Changed from hPa to kPa | nimmetM1.b1 |
D060817.2 | NIM/MET/S1 - Reprocess: Barometric Data Changed from hPa to kPa | nimmetS1.b1 |
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 |
D061006.1 | NIM/SKYRAD/M1 - Tracker inoperative | 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 |
---|---|---|---|
12/27/2005 | 0000 | 04/20/2006 | 1400 |
Subject: | NIM/MPL/M1 - False Positive Cloud Base Height Values During Solar Noon |
DataStreams: | nimmplM1.00, nimmplM1.a1 |
Description: | As the laser ages, the output reduces. This lowers the signal to noise ratio. The lower signal to noise ratio interferes with the cloud base height algorithm to correctly determine if a cloud is actually present. During solar noon the signal to noise ratio is the lowest. This condition results in many false positive values. The values start at a high altitude and progressively get lower as the sun gets to zenith. The trend reverses as the sun passes. The pattern in the data resembles a ?V? shape starting 2 hours before solar noon to 2 hour past. A low incident of false positive values exists from 20051227. However, the condition becomes prominent on 20060303 - 20060420. The cloud base calibration table was modified to compensate for the lower signal to noise levels. Note: If a cloud is actually present, the cloud base algorithm will determine the height and report correctly. The false positive values are only a concern during cloud free conditions. |
Measurements: | nimmplM1.a1:
nimmplM1.00:
|
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 |
---|---|---|---|
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 |
---|---|---|---|
01/10/2006 | 1600 | 03/01/2006 | 0803 |
Subject: | NIM/MET/M1 - Software problem |
DataStreams: | nimmetM1.b1 |
Description: | Intermittent Failure of Logger to read data from the Barometer. |
Measurements: | nimmetM1.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: | nimmwrprawM1.00:
nimmwrpM1.b1:
nimmwrpM1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/13/2006 | 0000 | 05/26/2006 | 1015 |
Subject: | NIM/MET/M1 - Optical Rain Gauge Failure |
DataStreams: | nimmetM1.b1 |
Description: | The optical rain gauge on the met system did not record precipitation during this time period. |
Measurements: | nimmetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/15/2006 | 0000 | 04/21/2006 | 0000 |
Subject: | NIM/MWRP/M1 - Reprocess: 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 following formula can be used to convert the wrong readings to the new: T_new = -60 + 1.1(T_old+50) where all temperatures are in degree C. For example, if T_old = 30 C, T_new = 28 C. |
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 - Reprocess: 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 are being reprocessing to remove the calibration bias. Note, this also affected standard deviation, maximum and minimum data fields. |
Measurements: | nimgndrad60sM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/2006 | 0000 | 07/10/2006 | 0930 |
Subject: | NIM/MET/M1 - Reprocess: Barometric Data Changed from hPa to kPa |
DataStreams: | nimmetM1.b1 |
Description: | Barometric pressure data was converted from hPa to kPa in order to standardize the measurement units among ARM sites and to conform to accepted standard units determined by the scientific community. |
Measurements: | nimmetM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/26/2005 | 0000 | 07/13/2006 | 0727 |
Subject: | NIM/MET/S1 - Reprocess: Barometric Data Changed from hPa to kPa |
DataStreams: | nimmetS1.b1 |
Description: | Barometric pressure data was converted from hPa to kPa in order to standardize the measurement units among ARM sites and to conform to accepted standard units determined by the scientific community. |
Measurements: | nimmetS1.b1:
|
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 |
---|---|---|---|
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:
|