DQR ID | Subject | Data Streams Affected |
---|---|---|
D060221.1 | NIM/MPL/M1 - False Positive Cloud Base Height Values During Solar Noon | nimmplM1.00, nimmplM1.a1 |
D060419.4 | NIM/MWR/M1 - Instrument noise problem/RF interference | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060718.1 | NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating. | nimmwrlosM1.b1, nimmwrtipM1.a1 |
D060927.1 | NIM/MWR/M1 - Sun in field of view of radiometer | nimmwrlosM1.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: | nimmplM1.00:
nimmplM1.a1:
|
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: | nimmwrtipM1.a1:
nimmwrM1.00:
nimmwrlosM1.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: | nimmwrtipM1.a1:
nimmwrlosM1.b1:
|
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:
|