Simulation of the Equatorial CO2 Ice Clouds on Mars using a General Circulation Model

Details Simulation of the Equatorial CO2 Ice Clouds on Mars using a General Circulation Model Simulation of the Equatorial CO2 Ice Clouds on Mars using a General Circulation Model

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4504k&link_type=abstract

American Astronomical Society, DPS meeting #42, #45.04; Bulletin of the American Astronomical Society, Vol. 42, p.1048

Astronomy and Astrophysics

Astronomy

Scientific paper

The OMEGA and HRSC onboard the Mars Express have observed the CO2 ice clouds above the height of 60 km of equatorial atmosphere on Mars. A Mars General Circulation Model (MGCM) developed in LMD predicts that the equatorial temperature can be lower than the CO2 condensation level at that height, especially two short periods before and after the aphelion, when the CO2 ice clouds were observed. We introduced a CO2 ice cloud formation scheme into our MGCM called DRAMATIC (Dynamics, RAdiation, MAterial Transport and InteraCtions between them, formerly CCSR/NIES/FRCGC), and simulated the distributions of the clouds. In the preliminary results the CO2 ice clouds were formed in the equatorial region at 60km height in northern spring and summer, at 70km height in northern fall and winter, with maximum mass mixing ratio of 25 ppm in the daily average. In this presentation we will show the vertical and seasonal variations of simulated CO2 ice clouds and the dependence of cloud formations on the local time, as well as the discussions in comparison with the observations.
Acknowledgement: This work is supported by the Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists, Grant-in-Aid 20-1761.

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