Data Quality Reports for Session: 104693 User: shippert Completed: 03/08/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060112.2GEC/TOMS/X1 - Calibration ErrorgectomsX1.a1, gectomsreflX1.00, gectomsozoneX1.00, gectomsaerosolindexX1.00


DQRID : D060112.2
Start DateStart TimeEnd DateEnd Time
01/01/2002000012/31/20052359
Subject:
GEC/TOMS/X1 - Calibration Error
DataStreams:gectomsX1.a1, gectomsreflX1.00, gectomsozoneX1.00, gectomsaerosolindexX1.00
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:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

gectomsozoneX1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

gectomsX1.a1:
  • north latitude for all the input platforms.(lat)
  • Time offset of tweaks from base_time(time_offset)
  • Date(date)
  • reflectivity(reflectivity)
  • Time offset from base_time(base_time)
  • column ozone(ozone)
  • east longitude for all the input platforms.(lon)
  • aerosol index(ai)

gectomsreflX1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)


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