| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D060112.4 | NIM/SKYRAD/M1 - IRTs do not agree with AERI | nimskyrad60sM1.b1 |
| D060222.1 | NIM/SKYRAD/M1 - Instrument ventilator problem | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| D060630.41 | NIM/SKYRAD/M1 - Reprocess: Longwave Calibration error | nimskyrad60sM1.b1 |
| D060915.1 | NIM/SKYRAD/M1 - Unknown problem with PIR1 | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| D061006.1 | NIM/SKYRAD/M1 - Tracker inoperative | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| D070203.2 | NIM/SKYRAD/M1 - station setup and troubleshooting | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| 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: | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 09/02/2006 | 0000 | 09/19/2006 | 0745 |
| Subject: | NIM/SKYRAD/M1 - Unknown problem with PIR1 |
| DataStreams: | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| 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 |
|---|---|---|---|
| 09/12/2006 | 1200 | 10/05/2006 | 1330 |
| Subject: | NIM/SKYRAD/M1 - Tracker inoperative |
| DataStreams: | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| 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 |
|---|---|---|---|
| 11/26/2005 | 0000 | 12/13/2005 | 1045 |
| Subject: | NIM/SKYRAD/M1 - station setup and troubleshooting |
| DataStreams: | nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00 |
| 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:
|