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IMK/IAA MIPAS retrievals version 8: CH₄ and N₂O

Glatthor, Norbert 1; Clarmann, Thomas von; Funke, Bernd; Garcia-Comas, Maya; Grabowski, Udo 1; Höpfner, Michael ORCID iD icon 1; Kellmann, Sylvia; Kiefer, Michael 1; Laeng, Alexandra; Linden, Andrea 1; Lopez-Puertas, Manuel; Stiller, Gabriele P. ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)

Abstract:

Using the IMK/IAA data processor, methane and nitrous oxide distributions were retrieved from version 8 limb emission spectra recorded with the Michelson Inferferometer for Passive Atmospheric Sounding (MIPAS). The dataset includes measurements from the Nominal, UTLS-1, Middle Atmosphere, Upper Atmosphere and Noctilucent Cloud observation modes. The processing differs from the previous version 5 data with respect to the atmospheric state variables jointly retrieved with the target gases CH4 and N2O, the treatment of the radiance offset, the selection of microwindows, the regularization, the spectroscopic data used and the treatment of horizontal variability of the atmospheric state. Besides the regular data product, a coarse-grid representation of the profiles with unity averaging kernels is available, as well as a specific research product for Middle Atmosphere measurements resulting from a slightly different retrieval approach. The CH4 errors are dominated by the large spectroscopic uncertainty for line intensities, which probably is too pessimistic, and estimated to be 21–34 % in the altitude range 6–68 km for northern midlatitude summer day conditions. ... mehr


Volltext §
DOI: 10.5445/IR/1000162268
Veröffentlicht am 15.09.2023
Originalveröffentlichung
DOI: 10.5194/egusphere-2023-919
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Zitationen: 1
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Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2023
Sprache Englisch
Identifikator KITopen-ID: 1000162268
HGF-Programm 12.11.25 (POF IV, LK 01) Atmospheric composition and circulation changes
Verlag Copernicus
Vorab online veröffentlicht am 16.06.2023
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