DQR ID | Subject | Data Streams Affected |
---|---|---|
D070913.1 | FKB/MWRHF/M1 - Dew formation on window | fkbmwrhfM1.b1 |
D071207.1 | FKB/MWRP/M1 - Heavy rain and fog at the site | fkbmwrpM1.b1 |
D080116.1 | FKB/MWRP/M1 - Possible slight drift of V-band calibration | fkbmwrpM1.b1 |
D080402.2 | FKB/MWRHF/M1 - Questionable calibration | fkbmwrhfM1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/22/2007 | 0000 | 12/31/2007 | 2300 |
Subject: | FKB/MWRHF/M1 - Dew formation on window |
DataStreams: | fkbmwrhfM1.b1 |
Description: | During night time, when the humidity is very high (RH ~ 100%) data are strongly affected by dew formation on the window. This results in a smooth and large (80-150 K) increase of the brightness temperature from early night to sunrise. Data are affected mostly at night. |
Measurements: | fkbmwrhfM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/06/2007 | 0000 | 12/15/2007 | 0000 |
Subject: | FKB/MWRP/M1 - Heavy rain and fog at the site |
DataStreams: | fkbmwrpM1.b1 |
Description: | The months of November and December have been very rainy and wet at the AMF site. During rain events the radiometer does not work properly because of water accumulating on the window. In addition condensation and fog will affect the data causing very high brightness temperatures. Although the instrument is equipped with rain detection system to flag bad data, it is important that the user pays extra attention to the quality of the data during periods of continuous rain, drizzle or fog by applying the quality checks and screening for high brightness temperatures. |
Measurements: | fkbmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/01/2007 | 0000 | 12/31/2007 | 2300 |
Subject: | FKB/MWRP/M1 - Possible slight drift of V-band calibration |
DataStreams: | fkbmwrpM1.b1 |
Description: | During the month of November and December the bias between model computations and measurements for the 51.25 and 52.28 GHz channels has slightly increased to about 3 K. This might be due to a slight drift in the calibration of these channels. The calibration error associated with these data is increased, to 2-3 K, for these two months. See this plot for a comparison of measurements (solid lines) and model (red dots) for the 51.25 (black), 52.28 (blue) and 53.85-GHz (green) channels. |
Measurements: | fkbmwrpM1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/01/2007 | 0000 | 10/13/2007 | 1615 |
Subject: | FKB/MWRHF/M1 - Questionable calibration |
DataStreams: | fkbmwrhfM1.b1 |
Description: | The instrument completed a tip curve calibration on June 30 and it did not calibrate again until Oct 13. Data during this time display large residuals (~ 6 K) when compared with model computations. It is likely that the tip curve calibration, although successful, wasn't good enough to have good accuracy. Since this instrument is still under testing the users should use the data with caution. Although the accuracy of the model itself is still debated, large residuals between the measurements and the model between June and October are probably in large part due to the poor calibration. |
Measurements: | fkbmwrhfM1.b1:
|