Data Quality Reports for Session: 104588 User: cloth Completed: 03/01/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000204.6SGP/BLC - Retraction of D000111.4 BLC offsetsgpblcC1.00, sgpblcC1.a1, sgpblcprofC1.a1
D020927.1SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivitiessgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
D040525.22SGP/BLC/C1 - Metadata errorssgpblcC1.a1
D040526.7SGP/MMCR/C1 - Metadata errorssgpmmcrcalC1.a1, sgpmmcrmonC1.a1, sgpmmcrpowC1.a1, sgpmmcrmomentsC1.a1


DQRID : D000204.6
Start DateStart TimeEnd DateEnd Time
04/01/1994000002/03/20002359
Subject:
SGP/BLC - Retraction of D000111.4 BLC offset
DataStreams:sgpblcC1.00, sgpblcC1.a1, sgpblcprofC1.a1
Description:
D000111.4 reported on the reprocessing status of the SGP BLC
data and indicated which time periods had been reprocessed to
remove a 110m offset.

First error:  the offset was actually 122m, not 110m.
Second error: an error in the reprocessing algorithm
              resulted in the offset not being removed.

This DQR retracts D000111.4.  All BLC data processed to date
still have a 122m offset.  That is the cloud base height 
reported in the data stream is 122m too high.

Data processed after 20000204 with version 7.0 of the algorithm 
(recorded in the header of the data file) do not contain the 
offset.

The data processed through 20000204 will be reprocessed
when resources are available.
Measurements:sgpblcC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

sgpblcprofC1.a1:
  • Base height of third cloud detected with threshold algorithm(cloud3)
  • Base height of third cloud detected with Klett algorithm(kcloud3)
  • Base height of second cloud detected with threshold algorithm(cloud2)
  • Base height of lowest cloud detected with threshold algorithm(cloud1)
  • Base height of second cloud detected with Klett algorithm(kcloud2)
  • Base height of lowest cloud detected with Klett algorithm(kcloud1)

sgpblcC1.a1:
  • Base height of lowest cloud detected with Klett algorithm(kcloud1)
  • Base height of lowest cloud detected with threshold algorithm(cloud1)
  • Base height of third cloud detected with Klett algorithm(kcloud3)
  • Base height of third cloud detected with threshold algorithm(cloud3)
  • Base height of second cloud detected with Klett algorithm(kcloud2)
  • Base height of second cloud detected with threshold algorithm(cloud2)


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DQRID : D020927.1
Start DateStart TimeEnd DateEnd Time
12/01/1996000002/04/20002359
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:
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)

sgparsclcbh1clothC1.c1:
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)

sgparscl1clothC1.c1:
  • MMCR Reflectivity(Reflectivity)
  • LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)
  • MMCR Best Estimate of Hydrometeor Reflectivity(ReflectivityBestEstimate)
  • BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
  • BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)


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DQRID : D040525.22
Start DateStart TimeEnd DateEnd Time
08/11/1994000005/23/20002359
Subject:
SGP/BLC/C1 - Metadata errors
DataStreams:sgpblcC1.a1
Description:
The latitude, longitude and altitude of the Belfort Laser Ceilometer
were incorrectly entered into the ARM database.  The correct 
location of the SGP.C1 BLC was:
     Lat: 36.606N
     Lon: 97.485W
     Alt:    316m
Measurements:sgpblcC1.a1:
  • altitude above sea levelaltunits(alt)
  • east longitude for all the input platforms.(lon)
  • north latitude for all the input platforms.(lat)


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DQRID : D040526.7
Start DateStart TimeEnd DateEnd Time
11/08/1996000005/05/20032359
Subject:
SGP/MMCR/C1 - Metadata errors
DataStreams:sgpmmcrcalC1.a1, sgpmmcrmonC1.a1, sgpmmcrpowC1.a1, sgpmmcrmomentsC1.a1
Description:
The latitude, longitude and altitude of the MMCR
were incorrectly entered into the ARM database.  The
correct location of the SGP.C1 MMCR is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m
Measurements:sgpmmcrpowC1.a1:
  • north latitude for all the input platforms.(lat)
  • east longitude for all the input platforms.(lon)
  • altitude above sea levelaltunits(alt)

sgpmmcrmonC1.a1:
  • east longitude for all the input platforms.(lon)
  • altitude above sea levelaltunits(alt)
  • north latitude for all the input platforms.(lat)

sgpmmcrmomentsC1.a1:
  • east longitude for all the input platforms.(lon)
  • altitude above sea levelaltunits(alt)
  • north latitude for all the input platforms.(lat)

sgpmmcrcalC1.a1:
  • east longitude for all the input platforms.(lon)
  • altitude above sea levelaltunits(alt)
  • north latitude for all the input platforms.(lat)


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