Title: Carbon Monoxide, Methane and Carbon Dioxide Columns Retrieved from SCIAMACHY by WFM-DOAS: Year 2003 Initial Data Set
Citation: ATMOSPHERIC CHEMISTRY AND PHYSICS vol. 5 p. 3313-3329
Publisher: European Geosciences Union
Publication Year: 2005
JRC N°: JRC30743
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30743
Type: Articles in periodicals and books
Abstract: The near-infrared nadir spectra measured by SCIAMACHY on-board ENVISAT contain information on the vertical columns of important atmospheric trace gases such as carbon monoxide (CO), methane (CH4) and carbon dioxide (CO2). The scientific algorithm WFM-DOAS has been used to retrieve this information. For CH4 and CO2 also column averaged mixing ratios (XCH4 and XCO2) have been determined by simultaneous measurements of the dry air mass. All available spectra of the year 2003 have been processed. We describe the algorithm versions used to generate the data (v0.4; for methane also v0.41) and show comparisons of monthly averaged data over land with global measurements (CO from MOPITT) and models (for CH4 and CO2). We show that enhanced concentrations ov CO resulting from biomass burning have been detected which are in reasonable agreement with MOPITT. The measured XCH4 is enhanced over India, south-east Asia, and central Africa in September / October 2003 in line with model simulations where they result from surface sources of methane such as rice fields and wetlands. In qualitative agreement with model simulations the XCO2 measurements over the northern hemisphere show the lowest mixing rations around July due to uptake of CO2 by the growing vegetation of the land biosphere. We also identified potential problems such as a too low inter-hemispheric gradient for CO, a time dependent bias of the methane columns on the order of a few percent, and a few percent too high CO2 over parts of the Sahara.
JRC Directorate:Sustainable Resources

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