Validation of MIPAS and SCIAMACHY Data by Ground-Based Spectroscopy at Kiruna, Sweden, and Izana, Tenerife Island (AOID-191)

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Within this ENVISAT validation project [AOID-191] ground-based measurements of different techniques have been performed at Kiruna in the Arctic and on Tenerife Island in the subtropics. These ground-based data were used to validate SCIAMACHY and MIPAS data. Using MIPAS 4.61 O3 profiles on a pressure scale and degrading their vertical resolution to that of the FTIR profiles a good agreement is demonstrated. The precision of FTIR O3 profiles is about 10 %. The differences between MIPAS and FTIR are within the combined error bar. MIPAS 4.61 HNO3 profiles differ about 10 to 15 % for altitudes above 15 km. The corresponding column amounts differ by 8.2 +/- 7.0 %. These differences can be explained by a scaling factor in the spectroscopic data base for HNO3 which has been applied in version 4.61. SCIAMACHY O3 and NO2 column amounts of versions 5.01 agree much better as compared to previous versions: The difference of SCIAMACHY O3 column amounts is about 8 % when compared to FTIR data from Kiruna and about 2 % when compared with DOAS data from Izaña, respectively. The difference of SCIAMACHY NO2 column amounts to Izaña DOAS data is about 9 %. Furthermore, O3 limb profiles from SCIAMACHY have been compared for the first time. The mean differences are up to 20%. However, shifting the SCIAMACHY profiles by +1.5 km reduces the discrepancies significantly. Then the mean relative difference is smaller than 10% for all altitude levels between 10 and 35 km. This shift is consistent with the erroneous height assignment of MIPAS profiles

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