Data Quality Reports for Session: 132135 User: reh10d Completed: 12/12/2010

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D081030.2SGP/CSPHOT/C1 - AOT 1640 channel data missingsgpcsphotaotC1.a1, sgpcsphotaotfiltC1.a1, sgpcsphotalm1duboC1.a1, sgpcsphotaotfiltqaC1.a1
D090716.2SGP/SWS/C1 - Contamination by scattered light on optics.sgpswsC1.b1
D100215.1SGP/VCEIL/C1/B4/B5/B6 - Reprocess: Incorrect serial_number and sum_backscatter fieldssgpvceil25kB4.b1, sgpvceil25kB5.b1, sgpvceil25kB6.b1, sgpvceil25kC1.b1


DQRID : D081030.2
Start DateStart TimeEnd DateEnd Time
09/24/2008000007/25/20102359
Subject:
SGP/CSPHOT/C1 - AOT 1640 channel data missing
DataStreams:sgpcsphotaotC1.a1, sgpcsphotaotfiltC1.a1, sgpcsphotalm1duboC1.a1, sgpcsphotaotfiltqaC1.a1
Description:
AOT 1640 channel data missing.  The instrument deployed at SGP from September 2008 to July 
2010 was not upgraded with this additional channel.
Measurements:sgpcsphotaotfiltqaC1.a1:
  • TripletVar_1640
  • Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)
sgpcsphotalm1duboC1.a1:
  • Aerosol optical thickness, 1640nm(AOT_1640)
sgpcsphotaotfiltC1.a1:
  • TripletVar_1640
  • Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)
sgpcsphotaotC1.a1:
  • TripletVar_1640
  • Aerosol optical thickness, at 1640 nm, from CSPHOT(aot_1640)

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DQRID : D090716.2
Start DateStart TimeEnd DateEnd Time
06/01/2006000006/01/20090000
Subject:
SGP/SWS/C1 - Contamination by scattered light on optics.
DataStreams:sgpswsC1.b1
Description:
It has been observed that the zenith radiance measurement is susceptible to contamination 
from light scattered off of the internal optics. This problem is most serious when 
measuring clear sky radiance in the presence of direct sun.  Under this worst case condition, 
it affects short wavelengths (less than 500 nm) at a few percent level, moderate 
wavelengths (500-800nm) between a few percent and 10-20%, and longer wavelengths up to 80% or more.

Chui and Marshak have demonstrated some success at identifying isolated affected data 
using the TSI to find cases of scattered clouds.  In general though, one must treat the 
zenith radiance data with considerable caution whenever direct solar radiance is likely to be 
present.  It is anticipated that the SWS zenith radiance for overcast skies is not 
significantly affected.

The instrument has been renovated by adding a sun shade to prevent direct sunlight from 
striking the optics.  An additional set of baffles further restricts the field of view, 
further reducing the potential for even off-axis bright clouds to affect the zenith 
measurement.  Data taken after June 2009 is considered to be free of contamination.
Measurements:sgpswsC1.b1:
  • Calibrated spectrum(zen_spec_calib)

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DQRID : D100215.1
Start DateStart TimeEnd DateEnd Time
04/01/2001000010/31/20092359
Subject:
SGP/VCEIL/C1/B4/B5/B6 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:sgpvceil25kB4.b1, sgpvceil25kB5.b1, sgpvceil25kB6.b1, sgpvceil25kC1.b1
Description:
Attribute serial_number: In most cases, this field is not representative of the actual 
serial number of the instrument because the value did not change when an instrument changed 
locations or was replaced with a spare.

Variable sum_backscatter: An out-of-range condition for the "sum of detected and 
normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 
0.0999 /srad.

This DQR also applies to a1 level data collected prior to b1 level.
Measurements:sgpvceil25kC1.b1:
  • sum_backscatter
sgpvceil25kB4.b1:
  • sum_backscatter
sgpvceil25kB6.b1:
  • sum_backscatter
sgpvceil25kB5.b1:
  • sum_backscatter

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