| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D020927.1 | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
| D100519.1 | SGP/ARSCL/C1 - Ceilometer not used during processing | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
| 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 |
|---|---|---|---|
| 11/20/2009 | 0000 | 12/31/2009 | 2359 |
| Subject: | SGP/ARSCL/C1 - Ceilometer not used during processing |
| DataStreams: | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
| Description: | The ceilometer was not used during processing due to a ceilometer data format change that ARSCL did not handle properly. As a result, cloud boundaries in the lowest several kilometers may be less accurate than usual, as they are based solely on the micropulse lidar and millimeter cloud radar. |
| Measurements: | sgparsclbnd1clothC1.c1:
sgparscl1clothC1.c1:
sgparsclcbh1clothC1.c1:
|