Intercomparison of 4 Years of Global Formaldehyde Observations from the GOME-2 and OMI Sensors
De Smedt, I.
Van Roozendael, M.
Earth and related Environmental sciences
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Formaldehyde (H2CO) tropospheric columns have been retrieved since 2007 from backscattered UV radiance measurements performed by the GOME-2 instrument on the EUMETSAT METOP-A platform. This data set extends the successful time-series of global H2CO observations established with GOME/ERS-2 (1996-2003), SCIAMACHY/ENVISAT (2003-now), and OMI on the NASA AURA platform (2005-now). In this work, we perform an intercomparison of the H2CO tropospheric columns retrieved from GOME-2 and OMI between 2007 and 2011, respectively at BIRA-IASB and at Harvard SAO. We first compare the global formaldehyde data products that are provided by each retrieval group, respectively via the TEMIS and NASA/mirador websites (http://www.temis.nl and http://mirador.gsfc.nasa.gov/). We then investigate each step of the retrieval procedure: the slant column fitting, the reference sector correction and the air mass factor calculation. Air mass factors are computed for OMI using external parameters consistent with those used for GOME-2. By doing so, the impacts of the different a priori profiles and aerosol corrections are quantified. The remaining differences are evaluated in view of the expected diurnal variations of the formaldehyde concentrations, using simulations performed with the IMAGES CTM.
CitationDe Smedt, I.; Van Roozendael, M.; Stavrakou, T.; Müller, J.-F.; Chance, K.; Kurosu, T. (2012). Intercomparison of 4 Years of Global Formaldehyde Observations from the GOME-2 and OMI Sensors. , Proceedings of ATMOS 2012 – Advances in Atmospheric Science and Applications, Vol. 708,