DQR ID | Subject | Data Streams Affected | Data Quality Metric |
---|---|---|---|
D030821.2 | NSA/SKYRAD/C1 - IRT incorrect min/max value | nsaskyrad60sC1.b1 | Does not affect quality |
D031007.2 | NSA/SKYRAD/C1 - IRT measurements during precipitation events | nsaskyrad60sC1.b1 | Suspect |
D031226.1 | NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too large | nsaskyrad60sC1.b1 | Suspect |
D131220.4 | NSA/SKYRAD/C1 - IRT bias | nsaskyrad60sC1.b1 | Suspect |
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/01/2001 | 0000 | 03/03/2003 | 2359 | Does not affect quality |
Subject: | NSA/SKYRAD/C1 - IRT incorrect min/max value |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | The values of valid_min and valid_max for field sky_ir_temp were incorrectly assigned to -49.7 and +50.0 C, respectively. The actual values should be -60 and +40 C. |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/01/1999 | 0000 | 03/28/2003 | 0200 | Suspect |
Subject: | NSA/SKYRAD/C1 - IRT measurements during precipitation events |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | The IRT measurement of sky/cloud temperature was in question during precipitation events because rain or snow could accumulate in the upward-pointed lens barrel. This was corrected by reorienting the IRT to measure the sky temperature as reflected by a gold mirror. |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
08/20/2001 | 0000 | 01/23/2002 | 0000 | Suspect |
Subject: | NSA/SKYRAD/C1 - NSA B&W nighttime offset in Barrow too large |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | This problem only became apparent as NSA C1 nights became long enough for full darkness. The shaded global diffuse instrument (Eppley 8-48) showed a negative nighttime offset larger than the expected 0 to -4 W/m2. Typically -5 to -8 W/m2. This size of offset is not uncommon with Eppley PSPs but not observed with Eppley 8-48s. The problem was corrected with replacement of mounting screws which were creating a ground loop. |
Measurements: | nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
03/28/2001 | 0015 | 08/20/2007 | 1830 | Suspect |
Subject: | NSA/SKYRAD/C1 - IRT bias |
DataStreams: | nsaskyrad60sC1.b1 |
Description: | Measurements of sky temperature, especially those <250K, were positively biased compared with AERI because there was no compensation for the reflectivity of the gold mirror. The problem was corrected by changing the IRT emissivity from 1.000 to 0.987. Use sky temperature measurements less than 230K with caution. Biases as large as 30K have been observed when the actual temperature, as measured by AERI, is less than 210 K. |
Measurements: | nsaskyrad60sC1.b1:
|