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The evaluation of SCIAMACHY CO and CH4 scientific data products, using ground-based FTIR measurements

Bart Dils(1), Martine De Mazière(1), Michael Buchwitz(2), Rüdiger de Beek(3), Jean-Francois Müller(1), Christian Frankenberg(4), Annemieke Gloudemans(5), Miranda van den Broek(5) and Hans Schrijver(5)

(1) Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium
(2) University of Bremen FB1, Otto-Hahn-Allee 1, D-28334, Germany
(3) University of Bremen FB1, Otto-Hahn-Allee 1, D-28334 Bremen, Germany
(4) University of Heidelberg, Im Neuenheimer feld 229, 69120 Heidelberg, Germany
(5) SRON, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands

Abstract

In the framework of the EVERGREEN project, three scientific algorithms, namely WFM-DOAS, IMAP-DOAS and IMLM, have been developed to retrieve the total column amounts of key atmospheric trace gases including CO and CH4 from SCIAMACHY nadir observations in its near-infrared channels. These channels offer the capability to detect trace gases in the planetary boundary layer, potentially making the associated retrieval products suited for regional source-sink studies. The retrieval products of these three algorithms, in their present status of development, have been compared to independent data from a ground-based quasi-global network of Fourier-transform infrared (FTIR)spectrometers. Comparisons have been made for individual data, as well as for monthly averages. To maximize the number of coincidences that satisfy the temporal and spatial collocation criteria, the individual SCIAMACHY data points have been compared with a 3rd order polynomial interpolation of the ground-based data with time. Particular attention has been paid to the question whether the products reproduce correctly the seasonal and latitudinal variabilities of the target species. We present an overall assessment of the data quality of the currently available latest versions of the CO and CH4 total column products from the three scientific retrieval algorithms.

 

Full paper

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