Water in the martian atmosphere as relic of recent impacts

Details Water in the martian atmosphere as relic of recent impacts Water in the martian atmosphere as relic of recent impacts

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..113w&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 4, p. (4)113-(4)116

Computer Science

Abundance, Deuterium, Hydrogen, Hypervelocity Impact, Mars (Planet), Mars Atmosphere, Water, Ice, Isotopic Enrichment, Mars Craters

Scientific paper

The process leading to hydrogen escape from the martian atmosphere discriminate sufficiently between H and D to give a 3 or 4-fold enrichment of deuterium in the upper atmosphere, but not the 5.2 times enrichment observed. If the present complement of water is a remnant of abundant early water lost from the planet, enrichment would be much higher. Steady sublimation of ice slightly enriched in D would explain the present datum. Alternatively, I propose episodic inputs into the atmosphere on a 105 yr scale, from crater ejecta of impacts in relic lakes and permafrost, as consistent with current cratering records. The last big cratering event (greater than 2 km diameter) that reset the D:H in mobile ice and atmospheric H2O would have occurred 4 x 104 yr ago.

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