Atmospheric Measurement Techniques www.atmos-meas-tech.net 1867-1381 1867-8548 2 1 2009 10.5194/amt-2-87-2009 http://www.atmos-meas-tech.net/2/87/2009/ http://www.atmos-meas-tech.net/2/87/2009/amt-2-87-2009.html http://www.atmos-meas-tech.net/2/87/2009/amt-2-87-2009.pdf 87 98 2009-04-07 Six years of total ozone column measurements from SCIAMACHY nadir observations C. Lerot christophe.lerot@aeronomie.be M. Van Roozendael J. van Geffen J. van Gent C. Fayt R. Spurr G. Lichtenberg A. von Bargen Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium RT Solutions, Inc., Cambridge, Massachusetts, USA German Aerospace Center (DLR), P.O. Box 1116, 82234 Wessling, Germany Total O₃ columns have been retrieved from six years of SCIAMACHY nadir UV radiance measurements using SDOAS, an adaptation of the GDOAS algorithm previously developed at BIRA-IASB for the GOME instrument. GDOAS and SDOAS have been implemented by the German Aerospace Center (DLR) in the version 4 of the GOME Data Processor (GDP) and in version 3 of the SCIAMACHY Ground Processor (SGP), respectively. The processors are being run at the DLR processing centre on behalf of the European Space Agency (ESA). We first focus on the description of the SDOAS algorithm with particular attention to the impact of uncertainties on the reference O₃ absorption cross-sections. Second, the resulting SCIAMACHY total ozone data set is globally evaluated through large-scale comparisons with results from GOME and OMI as well as with ground-based correlative measurements. The various total ozone data sets are found to agree within 2% on average. However, a negative trend of 0.2–0.4%/year has been identified in the SCIAMACHY O₃ columns; this probably originates from instrumental degradation effects that have not yet been fully characterized. Bass, A. M. and Paur, R. 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