First results on Martian carbon monoxide from Herschel/HIFI observations

Details First results on Martian carbon monoxide from Herschel/HIFI observations First results on Martian carbon monoxide from Herschel/HIFI observations

2010-07-08

arxiv.org/abs/1007.1291v2

Astron.Astrophys. 521 (2010) L48

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Accepted for publication in Astronomy and Astrophysics (special issue on HIFI first results); minor changes to match published

Scientific paper

10.1051/0004-6361/201015159

We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotational transitions of the isotopes ^{13}CO at 771 GHz and C^{18}O at 768 GHz in order to retrieve the mean vertical profile of temperature and the mean volume mixing ratio of carbon monoxide. The derived temperature profile agrees within less than 5 K with general circulation model (GCM) predictions up to an altitude of 45 km, however, show about 12-15 K lower values at 60 km. The CO mixing ratio was determined as 980 \pm 150 ppm, in agreement with the 900 ppm derived from Herschel/SPIRE observations in November 2009.

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