Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1373w&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1373
Mathematics
Logic
Scientific paper
Despite the extensive geological evidence for flowing water on Mars up to four billion years ago, there is as yet no comprehensive explanation for its occurrence. Here, based on our 3D simulations of the Martian water cycle under a faint young Sun and denser CO2 atmosphere, we compare two possible climate scenarios for valley network formation: a multiple-bar CO2 atmosphere with sufficient greenhouse warming to allow long-term surface liquid water, and a 'thin atmosphere' (0.2 to 1 bar), mainly frozen scenario in which only episodic flowing water is possible. The former case unequivocally predicts sufficient rainfall for valley network formation but is in conflict with current constraints from atmospheric evolution theories. In the latter scenario, ice typically migrates to the southern highlands due to the correlation of temperature with altitude, although only transient melting is possible due to the lower temperatures.
Charnay Benjamin
Forget Francois
Madeleine Jean-Baptiste
Millour Ehouarn
Wordsworth Robin
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