| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D060222.1 | NIM/SKYRAD/M1 - Instrument ventilator problem | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| D060915.1 | NIM/SKYRAD/M1 - Unknown problem with PIR1 | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| D061006.1 | NIM/SKYRAD/M1 - Tracker inoperative | nimskyradM1.00, nimskyrad20sM1.a0, 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 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:
|