Data Quality Report

Data Quality Report for Order ID: 186280
User ID: guoc1 Date completed: 2017-06-21

All DQRs

DQR ID	Subject	Affected Data Streams	Data Quality Metric
D020927.1	SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities	sgparsclcbh1clothC1.c1	Suspect

DQR ID: D020927.1 (Back to Top)

Start Date	Start Time	End Date	End Time	Data Quality Metric
1996-12-01	00:00:00	2000-02-04	23:59:00	Suspect

Subject:	SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities
Affected Datastreams:	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	CloudBaseCeilometerCloth (BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height) CloudBaseCeilometerStd (BLC/VCEIL Standard Algorithm Cloud Base Height)