DQRID : D060112.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/01/2002000012/31/20052359Suspect
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Subject:
GEC/TOMS/X1 - Calibration Error
DataStreams:gectomsozoneX1.00, gectomsX1.a1, gectomsaerosolindexX1.00, 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.
Suggestions: 
Data should not be used for trend analysis.
Measurements:gectomsreflX1.00:
  • Raw data stream - documentation not supported
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gectomsaerosolindexX1.00:
  • Raw data stream - documentation not supported
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gectomsozoneX1.00:
  • Raw data stream - documentation not supported
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gectomsX1.a1:
  • date
  • ai
  • lon
  • base_time
  • time_offset
  • ozone
  • lat
  • reflectivity
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