| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D020927.1 | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
| D100402.3 | GRW/WACR/M1 - Coherence Filter Contamination | grwwacrM1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/1996 | 0000 | 02/04/2000 | 2359 |
| Subject: | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities |
| DataStreams: | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
| Description: | Prior to February 4, 2000, the ARSCL data set incorporated data from the Beaufort Laser Ceilometer as one of its inputs. Because of the BLC's high spatial resolution, this data was often chosen by ARSCL as the "CloudBaseBestEstimate" for boundary layer clouds. It was subsequently determined that the BLC cloud base was biased, with the BLC reporting cloud base heights that are 122 meters too high. The bias error will be corrected when the entire ARSCL data set is reprocessed as part of release_4. (The release version number is included the the netCDF global comments). This reprocessing will also include a small correction the the MMCR near-field reflectivities. This correction is less than 1 dB except for hydrometers within 200 meters of the surface. Thanks to Roger Marchand for helping bracket this problem. |
| Measurements: | sgparsclbnd1clothC1.c1:
sgparscl1clothC1.c1:
sgparsclcbh1clothC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/09/2009 | 1600 | 04/02/2010 | 1200 |
| Subject: | GRW/WACR/M1 - Coherence Filter Contamination |
| DataStreams: | grwwacrM1.b1 |
| Description: | The coherence filter (software) that was added to the WACR under BCR-01500 was causing occasional contamination to WACR data. This was exhibited in the first 2000 m of range by streaking in the data over a period of time. It didn't occur often and when it did, it is quite obvious looking at the plots. On 4/2/2010 at 12:00 UTC, the coherence filter was modified to preclude working on signals with a SNR greater than 60 dB. The vendor thinks this will solve the problem. |
| Measurements: | grwwacrM1.b1:
|