Fate of Earth Microbes on Mars: UV Radiation Effects

Details Fate of Earth Microbes on Mars: UV Radiation Effects Fate of Earth Microbes on Mars: UV Radiation Effects

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0021447c&link_type=abstract

Technical Report, Bay Area Environmental Research Inst. San Francisco, CA United States

Mathematics

Logic

Radiative Transfer, Models, Mars Environment, Mars Surface, Microorganisms, Deactivation, Deoxyribonucleic Acid, Dust, Irradiance, Losses, Mars (Planet), Radiation Effects, Ultraviolet Radiation, Viability

Scientific paper

A radiative transfer model is used to quantitatively investigate aspects of the martian ultraviolet radiation environment. Biological action spectra for DNA inactivation are used to estimate biologically effective irradiances for the martian surface under cloudless skies. Although the present-day martian UV flux is similar to early earth and thus may not be a limitation to life in the evolutionary context, it is a constraint to an unadapted biota and will rapidly kill spacecraft-borne microbes not covered by a martian dust layer. Here calculations for loss of microbial viability on the Pathfinder and Polar lander spacecraft are presented and the effects of martian dust on loss of viability are discussed. Details of the radiative transfer model are presented.

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