References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-825-2008

Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements

Griesfeller

¹ ³ von Clarmann

² Griesfeller

¹ ⁴ Höpfner

² Milz

² ⁵ Nakajima

¹ Steck

² Sugita

¹ Tanaka

¹ Yokota

National Institute for Environmental Studies (NIES), Tsukuba, Japan

Inst. für Meteorologie und Klimaforschung (IMK), Forschungszentrum Karlsruhe und Univ. Karlsruhe, Karlsruhe, Germany

now at: Service d'Aéronomie, CNRS, Verrières-le-Buisson, France

now at: Laboratoire des Sciences du Climat et de l'Environnement CEA/CNRS/UVSQ-IPSL, Gif-sur-Yvette, France

now at: Institutionen för Rymdvetenskap, Luleå Tekniska Universitet, Kiruna, Sweden

20 02 2008

8 4 825 843

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/8/825/2008/acp-8-825-2008.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/825/2008/acp-8-825-2008.pdf

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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