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Carbon monoxide, methane and carbon dioxide retrieved from SCIAMACHY near-infrared nadir observations using WFM-DOAS

Michael Buchwitz(1), Ruediger de Beek(1), John P. Burrows(1), Heinrich Bovensmann(1), Bart Dils(2) and Martine DeMaziere(2)

(1) University of Bremen FB1, Otto Hahn Allee 1, 28334 Bremen, Germany
(2) Belgian Institute for Space Aeronomy (BIRA-IASB), 3, Avenue Circulaire, 1180 Bruxelles, Belgium


The near-infrared nadir spectra of reflected solar radiation measured by SCIAMACHY on-board ENVISAT contain information on the vertical columns of important atmospheric trace gases such as the greenhouse gases methane (CH4) and carbon dioxide (CO2) and the air pollutant carbon monoxide (CO). The scientific algorithm WFM-DOAS has been used to retrieve this information. For CH4 and CO2 our main data products are dry air column averaged mixing ratios (XCH4 in ppbv and XCO2 in ppmv) determined by simultaneous measurements of the dry air mass obtained from, e.g., oxygen (O2). Our CO data product is the CO vertical column in molecules/cm2. The SCIAMACHY data set is unique because of the high sensitivity of the near-infrared measurements with respect to concentration changes in the atmospheric boundary layer. This sensitivity is a pre-requisite to get information on regional surface sources and sinks which are currently only poorly constrained globally by atmospheric measurements. We present the current status of this activity including comparisons with global and local reference data (MOPITT, ground based FTS, and global models).


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Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry