Validation of SCIAMACHY Scientific Retrievals of CO, CH4, N2O, and NO2 by FTIR at the Ground Truthing Station Zugspitze

Details Validation of SCIAMACHY Scientific Retrievals of CO, CH4, N2O, and NO2 by FTIR at the Ground Truthing Station Zugspitze Validation of SCIAMACHY Scientific Retrievals of CO, CH4, N2O, and NO2 by FTIR at the Ground Truthing Station Zugspitze

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.562e..39s&link_type=abstract

Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), 3-7 May 2004, ESA-ESRIN, Frascat

Physics

Scientific paper

Solar FTIR measurements at the Permanent Ground Truthing Station Zugspitze (47 °N, 11 °E), Germany are used to validate ENVISAT/SCIAMACHY Scientific Data Products retrieved at the University of Bremen, i.e., the infrared WFM-DOAS ver. 0.4 total column products of CO, CH4, N2O, and the scientific DOAS NO2 column product (ver. UB1.0). For WFM-DOAS, only relative changes due to the annual cycle are investigated, since these column retrievals include empirical scaling factors. To obtain a statistically significant fit to the CO annual cycle (10 % amplitude) out of the scatter of the SCIAMACHY WFM-DOAS data (available data cover Jan-Oct 2003), all pixels within a radius of at least 1000-2000 km around Zugspitze had to be averaged for each day. The weaker (2.5 % amplitude) annual cycles of CH4 and N2O could not be retrieved from SCIAMACHY data, even using averages of all pixels within a full latitudinal band of +/-2000 km north/south relative to the Zugspitze around the globe. Validating one full year of UB1.0 NO2 total column data (Jul 2003 ­ Jun 2003) a perfect agreement of the annual cycle to the ground FTIR data has been found, after removing obvious enhancements due to pollution episodes not captured by the high altitude (2964 m asl.) Zugspitze FTIR. After this correction, the SCIAMACHY UB1.0 columns of NO2 are 16 % below the Zugspitze FTIR columns on average

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