Comparison of HDO measurements from Envisat/MIPAS with observations by Odin/SMR and SCISAT/ACE-FTS
Author:
Lossow S.,Steinwagner J.,Urban J.,Dupuy E.,Boone C. D.,Kellmann S.,Linden A.,Kiefer M.,Grabowski U.,Höpfner M.,Glatthor N.,Röckmann T.,Murtagh D. P.,Walker K. A.,Bernath P. F.,von Clarmann T.,Stiller G. P.
Abstract
Abstract. Measurements of thermal emission in the mid-infrared by Envisat/MIPAS allow the retrieval of HDO information roughly in the altitude range between 10 km and 50 km. From September 2002 to March 2004 MIPAS performed measurements in the full spectral mode. To assess the quality of the HDO data set obtained during that period comparisons with measurements by Odin/SMR and SCISAT/ACE-FTS were performed. Comparisons were made on profile-to-profile basis as well as using seasonal and monthly means. All in all the comparisons yield favourable results. The largest deviations between MIPAS and ACE-FTS are observed below 15 km, where relative deviations can occasionally exceed 100%. Despite that the latitudinal structures observed by both instruments fit. Between 15 km and 20 km there is less consistency, especially in the Antarctic during winter and spring. Above 20 km there is a high consistency in the structures observed by all three instruments. MIPAS and ACE-FTS typically agree within 10%, with MIPAS mostly showing higher abundances than ACE-FTS. Both data sets show considerably more HDO than SMR. This bias can mostly be explained by uncertainties in spectroscopic parameters. Above 40 km, where the MIPAS HDO retrieval reaches its limits, still good agreement with the structures observed by SMR is found for most seasons. This puts some confidence in the MIPAS data at these altitudes.
Publisher
Copernicus GmbH
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