Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986s%26t....72...17c&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 72, July 1986, p. 17-22.
Other
Carbon Dioxide Concentration, Climatology, Earth Environment, Ice Environments, Land Ice, Mars Environment, Earth Axis, Ice Formation, Mars Atmosphere, Primitive Earth Atmosphere, Solar Magnetic Field
Scientific paper
Possible mechanisms to explain the global ice covering of Mars, and previous ice ages on the earth, are considered. Evidence for the Milankovitch effect is found in the close correspondence of earth's past climate with its orbital variations, as recorded principally in ocean sediments, and the role of CO2 is discussed. Mars' range of obliquity, 10 times that of the earth, and orbital eccentricity, fluctuating over a range 2 1/2 times that of the earth, could produce an important climate-driving cycle. Mathematical models of the Martian surface and atmosphere based on Viking data suggest that escaped CO2 could create a surface pressure of 1-3 bars. Other factors such as the effect of continental drift, the increased brightness of the sun, and planetary reversals of magnetic field polarity are discussed, and the questions of where Martian water and CO2 have gone are considered.
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