Atmos. Chem. Phys. Discuss., 5, 557-572, 2005
www.atmos-chem-phys-discuss.net/5/557/2005/
doi:10.5194/acpd-5-557-2005
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Validation of ENVISAT/SCIAMACHY columnar CO by FTIR profile retrievals at the Ground-Truthing Station Zugspitze
R. Sussmann1 and M. Buchwitz2
1IMK-IFU, Forschungszentrum Karlsruhe, Garmisch-Partenkirchen, Germany
2Institute of Environmental Physics (iup), University of Bremen FB1, Bremen, Germany

Abstract. Carbon monoxide vertical profile retrievals from ground-based solar FTIR measurements at the Permanent Ground-Truthing Station Zugspitze (47.42° N, 10.98° E, 2964 m a.s.l.), Germany are used to validate columnar CO retrieved from ENVISAT/SCIAMACHY spectra (WFM-DOAS version 0.4). The WFM-DOAS retrievals of CO include an empirical column scaling factor of 0.5. Therefore, not absolute column levels are validated, but the proper response of the SCIAMACHY retrievals to the atmospheric inter-annual variability is quantitatively assessed in comparison to the Zugspitze FTIR results. Although CO WFM-DOAS data for only 33 days are available up to now (data covering January–October 2003), it is possible to retrieve information on the CO annual cycle (≈10% amplitude) in a statistically significant fit out of the scatter of the SCIAMACHY WFM-DOAS data. To obtain this, all pixels within a minimum radius of 2000 km around Zugspitze had to be averaged for each day.

Citation: Sussmann, R. and Buchwitz, M.: Validation of ENVISAT/SCIAMACHY columnar CO by FTIR profile retrievals at the Ground-Truthing Station Zugspitze, Atmos. Chem. Phys. Discuss., 5, 557-572, doi:10.5194/acpd-5-557-2005, 2005.
 
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