Data Quality Reports for Session: 104760 User: trneb1 Completed: 03/13/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D020927.1SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivitiessgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1
D040525.28SGP/MPL/C1 - Metadata errorssgpmplC1.a1, sgpmplnor1campC1.c1
D040525.29SGP/MPL/C1 - Metadata errorssgpmplcbh1scottC1.c1
D041112.2SGP/MOLTS/X1 - Reprocess: time_offsetsgpmoltsedassfcclass0X1.a1, sgpmoltsedassndclass0X1.a1
D041112.7SGP/MOLTS/X1 - Reprocess: time_offsetsgpmoltsedassfcclass1X1.a1, sgpmoltsedassndclass1X1.a1
D050502.2SGP/SIRS/C1 - SWFANAL Data description errorsgp1swfanalsirs1longC1.c1, sgp15swfanalsirs1longC1.c1
D980331.1Instrument misalignment reportsgpmplnor1campC1.c1


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 : D040525.28
Start DateStart TimeEnd DateEnd Time
05/01/1996000001/19/20002359
Subject:
SGP/MPL/C1 - Metadata errors
DataStreams:sgpmplC1.a1, sgpmplnor1campC1.c1
Description:
The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m
Measurements:sgpmplC1.a1:
  • north latitude for all the input platforms.(lat)
  • east longitude for all the input platforms.(lon)
  • altitude above sea levelaltunits(alt)

sgpmplnor1campC1.c1:
  • north latitude for all the input platforms.(lat)
  • altitude above sea levelaltunits(alt)
  • east longitude for all the input platforms.(lon)


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DQRID : D040525.29
Start DateStart TimeEnd DateEnd Time
04/10/1994000001/19/20002359
Subject:
SGP/MPL/C1 - Metadata errors
DataStreams:sgpmplcbh1scottC1.c1
Description:
The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m
Measurements:sgpmplcbh1scottC1.c1:
  • 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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DQRID : D041112.2
Start DateStart TimeEnd DateEnd Time
06/01/1997000009/27/19992359
Subject:
SGP/MOLTS/X1 - Reprocess: time_offset
DataStreams:sgpmoltsedassfcclass0X1.a1, sgpmoltsedassndclass0X1.a1
Description:
The "time_offset" field was incorrectly written as "time_offsets" (extra "s")
Measurements:sgpmoltsedassfcclass0X1.a1:
  • Time offset from base_time(time_offsets)

sgpmoltsedassndclass0X1.a1:
  • Time offset from base_time(time_offsets)


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DQRID : D041112.7
Start DateStart TimeEnd DateEnd Time
06/01/1997000012/31/20042359
Subject:
SGP/MOLTS/X1 - Reprocess: time_offset
DataStreams:sgpmoltsedassfcclass1X1.a1, sgpmoltsedassndclass1X1.a1
Description:
The "time_offset" field was incorrectly written as "time_offsets" (extra "s")
Measurements:sgpmoltsedassfcclass1X1.a1:
  • Time offset from base_time(time_offsets)

sgpmoltsedassndclass1X1.a1:
  • Time offset from base_time(time_offsets)


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DQRID : D050502.2
Start DateStart TimeEnd DateEnd Time
03/25/1997000012/10/20032359
Subject:
SGP/SIRS/C1 - SWFANAL Data description error
DataStreams:sgp1swfanalsirs1longC1.c1, sgp15swfanalsirs1longC1.c1
Description:
The long name attribute for the cloud effect fields incorrectly
defines the cloud effect to be the difference between the 
clearskyfit and measured values:

"Difference: ***fluxdn_clearskyfit - ***fluxdn_measured (***fcg)" ;

The cloud effects are correctly calculated by subtracting the 
irradiance calculated in the clear sky fit from the measured 
irradiance.

"Difference: ***fluxdn_measured - ***fluxdn_clearskyfit (***fcg)" ;

NOTE: this is just a documentation error.  The data are correctly
calculated.
Measurements:sgp1swfanalsirs1longC1.c1:
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)

sgp15swfanalsirs1longC1.c1:
  • Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
  • Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
  • Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)


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DQRID : D980331.1
Start DateStart TimeEnd DateEnd Time
04/15/1997000009/10/19970000
Subject:
Instrument misalignment report
DataStreams:sgpmplnor1campC1.c1
Description:
A low-resolution (300 m) MPL system (unit number 04) was installed at the
SGP site in April '97 upon the laser diode failure of the 02 unit in
March.  Calibration of this instrument in August found that the optics
were misaligned causing a near range focusing error in the data.  
Calibration files produced for this data, while acceptable, do not 
completely correct for the problem.  As a result, aerosol property 
retrievals using this data are not suggested.  Cloud boundary heights, 
though appear satisfactory.  This system was removed from SGP in early 
September
Measurements:sgpmplnor1campC1.c1:
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)


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