Earth and Mars: Evolution of Atmospheres and Surface Temperatures

Details Earth and Mars: Evolution of Atmospheres and Surface Temperatures Earth and Mars: Evolution of Atmospheres and Surface Temperatures

Jul 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972sci...177...52s&link_type=abstract

Science, Volume 177, Issue 4043, pp. 52-56

Mathematics

Logic

130

Scientific paper

Solar evolution implies, for contemporary albedos and atmospheric composition, global mean temperatures below the freezing point of seawater less than 2.3 aeons ago, contrary to geologic and paleontological evidence. Ammonia mixing ratios of the order of a few parts per million in the middle Precambrian atmosphere resolve this and other problems. Possible temperature evolutionary tracks for Earth and Mars are described. A runaway greenhouse effect will occur on Earth about 4.5 aeons from now, when clement conditions will prevail on Mars.

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