Atmospheric Chemistry and Physics
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8
4
2008
10.5194/acp-8-825-2008
http://www.atmos-chem-phys.net/8/825/2008/
http://www.atmos-chem-phys.net/8/825/2008/acp-8-825-2008.html
http://www.atmos-chem-phys.net/8/825/2008/acp-8-825-2008.pdf
825
843
2008-02-20
Intercomparison of ILAS-II version 1.4 and version 2 target parameters with MIPAS-Envisat measurements
A. Griesfeller
T. von Clarmann
J. Griesfeller
M. Höpfner
M. Milz
H. Nakajima
T. Steck
T. Sugita
tsugita@nies.go.jp
T. Tanaka
T. 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
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 H<sub>2</sub>O,
N<sub>2</sub>O, and CH<sub>4</sub> and the coincidence criteria of ±300 km in space and
±6 h in time for ClONO<sub>2</sub>, O<sub>3</sub>, and HNO<sub>3</sub> 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 H<sub>2</sub>O, CH<sub>4</sub>, ClONO<sub>2</sub>, and O<sub>3</sub>. In
particular, the ILAS-II version 1.4 mixing ratios of H<sub>2</sub>O and CH<sub>4</sub> were
unrealistically small, and those of ClONO<sub>2</sub> above altitudes of 30 km
unrealistically large. For N<sub>2</sub>O and HNO<sub>3</sub>, 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 H<sub>2</sub>O data in the Southern Hemisphere, further data quality evaluation is necessary.
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