High obliquity as a solution to warm polar conditions on Early Mars

Details High obliquity as a solution to warm polar conditions on Early Mars High obliquity as a solution to warm polar conditions on Early Mars

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p32a..05j&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #P32A-05

Other

3346 Planetary Meteorology (5445, 5739), 5407 Atmospheres: Evolution, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)

Scientific paper

Maintaining warm conditions in the polar regions on early Mars is problematic for several reasons: (1) Mars receives only 43% the insolation of the Earth and the SunOs luminosity was reduced by 25% early in its history. (2) Given the present day Martian tilt, the polar region would have received the smallest amounts of insolation on an annual basis. (3) Very high carbon dioxide concentrations are needed to warm Mars but condensation would occur after several bars are accumulated in the atmosphere. Consequently, the suggested polar ocean on Mars seems unlikely unless Mars had a high obliquity early in its history. Simple calculations using a GCM are presented with obliquity values of 24 and 70 degrees. Boundary conditions include: a global bare surface containing no vegetation and a simulation using high latitude polar oceans. The results show that warm ocean temperatures under high obliquity are not possible because of the formation of sea ice. However, the results suggests that a combination of high obliquity, elevated CO2, geothermal heat sources and IR scattering by CO2 clouds could explain how a polar ocean was maintain on early Mars and why warm conditions may have disappeared.

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