Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-9319-2007
http://www.atmos-chem-phys-discuss.net/7/9319/2007/
http://www.atmos-chem-phys-discuss.net/7/9319/2007/acpd-7-9319-2007.html
http://www.atmos-chem-phys-discuss.net/7/9319/2007/acpd-7-9319-2007.pdf
9319
9365
2007-07-02
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
Institute of Meteorology and Climate Research (IMK-ASF), Forschungszentrum Karlsruhe and University Karlsruhe, Karlsruhe, Germany
on leave
We compared measurements taken by two satellite-borne instruments, ILAS-II
and MIPAS-Envisat, between May and October 2003. Using 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>, a different number
of coincidences have been found for the gases. The data were separated into
sunrise and sunset measurements, which correspond to Northern and Southern
Hemisphere data, respectively. For the sunrise data of ILAS-II, a clear
improvement from Version 1.4 to Version 2.1 was observed for H<sub>2</sub>O, CH<sub>4</sub>,
ClONO<sub>2</sub>, and O<sub>3</sub>. For ILAS-II N<sub>2</sub>O and HNO<sub>3</sub> data there were no large
differences between the two data sets. In particular, the ILAS-II Version
1.4 data were unrealistically small for H<sub>2</sub>O, CH<sub>4</sub>, and O<sub>3</sub> and
unrealistically large for ClONO<sub>2</sub> above 20 km to 30 km. The differences
between the two algorithm versions for the sunset data were not as large as
for the sunrise data for all gases, and for H<sub>2</sub>O and CH<sub>4</sub>. ILAS-II
Version 1.4 data fitted even better to the MIPAS-Envisat measurements than
Version 2.0.
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