Berlin 2005 – scientific programme

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UP: Umweltphysik

UP 6: Poster: Aerosole

UP 6.15: Poster

Tuesday, March 8, 2005, 10:15–12:15, Poster TU HTF

Validation of ENVISAT/SCIAMACHY operational versus scientific retrievals of NO2 by solar FTIR at the Ground Truthing Station Zugspitze — •Ralf Sussmann¹, Wolfgang Stremme¹, Alexander Rockmann¹, Markus Rettinger¹, and Andreas Richter² — ¹Forschungszentrum Karlsruhe, IMK-IFU, Garmisch-Partenkirchen — ²Universität Bremen, Institut für Umweltphysik

NO2 retrievals from solar FTIR measurements at the Permanent Ground Truthing Station Zugspitze (47^∘ N, 11^∘ E, 2964 m asl.), Germany are used to validate columnar NO2 retrieved from ENVISAT/SCIAMACHY. Validating scientific (UB1.0) NO2 total column data (Jul - Jun 2003), a perfect agreement of the annual cycle to the ground FTIR data is found, after removing obvious enhancements due to pollution episodes not captured by the high altitude Zugspitze FTIR. The absolute SCIAMACHY UB1.0 columns are 16 % below the Zugspitze FTIR columns. The operational SCIAMACHY NO2 retrievals (DOAS_1, ESA master set), however, are not able to reflect the NO2 decrease in the second half of the annual cycle. Possible reasons for this difference between the scientific versus operational NO2 retrievals will be discussed in the poster.