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Methane and carbon dioxide column-averaged mixing ratios from SCIAMACHY on ENVISAT

Oliver Schneising(1), Michael Buchwitz(1), Maximilian Reuter(1), Heinrich Bovensmann(1) and John P. Burrows(1)

(1) University of Bremen FB1, Otto Hahn Allee 1, 28334 Bremen, Germany

Abstract

Methane (CH4) and carbon dioxide (CO2) are the two most important anthropogenic greenhouse gases contributing to global climate change. Despite their importance our knowledge about their variable natural and anthropogenic sources and sinks has significant gaps. Satellite observations can add important global scale information on greenhouse gas sources and sinks provided the data are accurate and precise enough and are sensitive to the lowest atmospheric layers where the variability due to regional greenhouse gas sources and sinks are largest. SCIAMACHY onboard ENVISAT is the first satellite instrument which covers important absorption bands of both gases in the near-infrared/shortwave-infrared (NIR/SWIR) spectral region. In nadir mode SCIAMACHY observes reflected and backscattered solar radiation. The daytime measurements are therefore very sensitive to near-surface greenhouse gas concentration changes except in case of significant cloud cover. At the Institute of Environmental Physics (IUP) of the University of Bremen, Germany, the Weighting Function Modified Differential Optical Absorption Spectroscopy (WFM-DOAS or WFMD) algorithm has been developed and is continuously improved to extract the atmospheric greenhouse gas information from the SCIAMACHY spectra. Retrieval and analysis focussed on the first three full years of the ENVISAT mission (2003-2005) but recently we started to also analyse the data after 2005. The status of this ongoing retrieval activity will be presented focussing on discussion of the SCIAMACHY greenhouse gas data sets over interesting source regions and first results from analysing SCIAMACHY data after 2005.

 

Workshop presentation