Modeling the Martian Climate with a New General Circulation Model: The water vapor greenhouse on Mars

Details Modeling the Martian Climate with a New General Circulation Model: The water vapor greenhouse on Mars Modeling the Martian Climate with a New General Circulation Model: The water vapor greenhouse on Mars

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3020u&link_type=abstract

American Astronomical Society, DPS meeting #42, #30.20; Bulletin of the American Astronomical Society, Vol. 42, p.1031

Astronomy and Astrophysics

Astronomy

Scientific paper

We have adapted the National Center for Atmospheric Research (NCAR) Community Atmosphere Model (CAM3.0) to Martian conditions. Modifications to the model include adjusting the planetary parameters such as gravity and albedo to Martian values, changing the atmospheric composition, replacing the radiative transfer scheme, changing the calendar to cover a Martian year, and the addition of a carbon dioxide condensation scheme. The Martian atmosphere is composed of 95% carbon dioxide, and as much as 25% of the atmosphere can condense out at the winter pole, having a significant impact on the dynamics as well as the energy budget.
We have performed simulations of the current climate at a resolution of 2x2.5 degrees (lat-lon), and have tuned the model to match the Viking Lander annual pressure cycle. Comparisons to vertical temperature profiles from the Thermal Emission Spectrometer (TES) show agreement to within +/- 5 K during northern spring through northern summer, but a consistently cooler atmosphere in the model during autumn and fall.
We have applied this model to investigate the water vapor greenhouse in an ancient atmosphere with 500 mbar of CO2. It is water vapor, not CO2, which dominates the greenhouse effect in such an atmosphere, just as is the case for modern Earth. We investigate the distribution of water vapor and ice clouds and their impacts on this climate system.

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