Data Quality Reports for Session: 113269 User: cj_flynn Completed: 07/18/2008

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040920.2GEC/TOMS/X1 - Reprocess: Retrieval algorithm version 7gectomsX1.a1, gectomsaerosolindexX1.00, gectomsozoneX1.00, gectomsreflX1.00
D060112.2GEC/TOMS/X1 - Calibration ErrorgectomsX1.a1, gectomsaerosolindexX1.00, gectomsozoneX1.00, gectomsreflX1.00


DQRID : D040920.2
Start DateStart TimeEnd DateEnd Time
07/25/1996000008/31/20042359
Subject:
GEC/TOMS/X1 - Reprocess: Retrieval algorithm version 7
DataStreams:gectomsX1.a1, gectomsaerosolindexX1.00, gectomsozoneX1.00, gectomsreflX1.00
Description:
A new set of TOMS retrievals are available since 2004-09-01 using the revised algorithm 
version 8.  The existing files in the ARM archive were all processed using the prior 
algorithm version 7.
For details about the differences see 
http://toms.gsfc.nasa.gov/version8/version8_update.html
Measurements:gectomsaerosolindexX1.00:
  • null(Raw data stream - documentation not supported)
gectomsozoneX1.00:
  • null(Raw data stream - documentation not supported)
gectomsX1.a1:
  • reflectivity(reflectivity)
  • column ozone(ozone)
  • aerosol index(ai)
gectomsreflX1.00:
  • null(Raw data stream - documentation not supported)

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DQRID : D060112.2
Start DateStart TimeEnd DateEnd Time
01/01/2002000012/31/20052359
Subject:
GEC/TOMS/X1 - Calibration Error
DataStreams:gectomsX1.a1, gectomsaerosolindexX1.00, gectomsozoneX1.00, gectomsreflX1.00
Description:
For data beginning in year 2000, the calibration has been stabilized relative to NOAA-16 
SBUV/2 in the equatorial zone. Because of continuing changes in the optical properties of 
the front scan mirror that are not well understood, we are now seeing a latitude 
dependent error that cannot be corrected by a simple calibration correction. The calibration 
appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% 
error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere. 
Because of this error, data since 2002 should NOT be used for trend analysis.
Measurements:gectomsaerosolindexX1.00:
  • null(Raw data stream - documentation not supported)
gectomsozoneX1.00:
  • null(Raw data stream - documentation not supported)
gectomsX1.a1:
  • lat(lat)
  • Time offset of tweaks from base_time(time_offset)
  • Date(date)
  • reflectivity(reflectivity)
  • base time(base_time)
  • column ozone(ozone)
  • lon(lon)
  • aerosol index(ai)
gectomsreflX1.00:
  • null(Raw data stream - documentation not supported)

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