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10-Years Operational GOME/ERS-2 Total Column Products: The GDP 4.0 Validation
Dimitris Balis(1), Jean-Christopher Lambert(2)
, Michel Van Roozendael(2)
, Robert Spurr(3)
, Diego Loyola(4)
, Yakov Livschitz(4)
, Pieter Valks(4)
, V. Amiridis(1)
, P. Gerard(2)
, J. Granville(2)
, and Claus Zehner(5)
(1)
Aristotle University of Thessaloniki,
Box 149,
54124 Thessaloniki,
Greece
(2) BIRA, Avenue Circulaire 3, 1180 Bruxelles, Belgium
(3) RT Solutions, Inc., 9 Channing Street, Cambridge MA 02138, United States
(4) DLR, Oberpfaffenhofen, D-82234 Wessling, Germany
(5) ESA, Via Galileo Galilei CP. 64, 00044 Frascati, Italy
Abstract
Results of a geophysical validation exercise regarding the new operational GOME data processor (GDP4.0) are presented. This exercise involves comparisons with NDSC and WMO/GAW ground-based networks as well as with the TOMS version 8 total ozone products.
For GOME, RMS values have improved by a factor of two compared with GDP 3.0; seasonal dependency is reduced by the same amount. On a global basis, GDP 4.0 total ozone results lie between -1% and +1.5% of ground-based values for solar zenith angles less than 70°; accuracy is now comparable to that obtainable from ground based stations. At higher solar zenith angles in Polar Regions, larger discrepancies of up to +4% are found; in these regimes, errors on both satellite and ground-based measurements are higher.
Up to 2003, total column products have not suffered from any long-term drift of quality, even with expected instrument degradation.
The validation results demonstrate that the re-processed GOME total ozone record is now sufficiently accurate for trend analysis (detection of 1% change in total ozone over 10 years).
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