de Graauw, T.[SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands; Leiden Observatory, University of Leiden, The Netherlands; Joint ALMA Observatory, Chile]
Jehin, Emmanuel[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
Kidger, M.[Science Centre, European Space Astronomy Centre, European Space Agency, Spain]
Lorente, R.[Science Centre, European Space Astronomy Centre, European Space Agency, Spain]
Naylor, D. A.[Department of Physics and Astronomy, University of Lethbridge, Canada]
[en] planets and satellites: atmospheres ; molecular processes ; radiative transfer ; submillimeter: general
[en] 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 [SUP]13[/SUP]CO at 771 GHz and C[SUP]18[/SUP]O and 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 ± 150 ppm, in agreement with the 900 ppm derived from Herschel/SPIRE observations in November 2009. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.