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| Titel |
Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements |
| VerfasserIn |
A. Griesfeller, T. Clarmann, J. Griesfeller, M. Höpfner, M. Milz, H. Nakajima, T. Steck, T. Sugita, T. Tanaka, T. Yokota |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 4 ; Nr. 8, no. 4 (2008-02-20), S.825-843 |
| Datensatznummer |
250005670
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| Publikation (Nr.) |
 copernicus.org/acp-8-825-2008.pdf |
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| Zusammenfassung |
| This paper assesses the mean differences between the two ILAS-II data
versions (1.4 and 2) by comparing them with MIPAS measurements made between
May and October 2003. For comparison with ILAS-II results, MIPAS data
processed at the Institut für Meteorologie und Klimaforschung, Karlsruhe,
Germany (IMK) in cooperation with the Instituto de Astrofísica de
Andalucía (IAA) in Granada, Spain, were used. The coincidence
criteria of ±300 km in space and ±12 h in time for H2O,
N2O, and CH4 and the coincidence criteria of ±300 km in space and
±6 h in time for ClONO2, O3, and HNO3 were used. The ILAS-II
data were separated into sunrise (= Northern Hemisphere) and sunset (=
Southern Hemisphere). For the sunrise data, a clear improvement from version
1.4 to version 2 was observed for H2O, CH4, ClONO2, and O3. In
particular, the ILAS-II version 1.4 mixing ratios of H2O and CH4 were
unrealistically small, and those of ClONO2 above altitudes of 30 km
unrealistically large. For N2O and HNO3, there were no large
differences between the two versions. Contrary to the Northern Hemisphere,
where some exceptional profiles deviated significantly from known
climatology, no such outlying profiles were found in the Southern Hemisphere
for both versions. Generally, the ILAS-II version 2 data were in better
agreement with the MIPAS data than the version 1.4, and are recommended for
quantitative analysis in the stratosphere. For H2O data in the Southern Hemisphere, further data quality evaluation is necessary. |
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