Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36.1391f&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 36, Dec. 1988, p. 1391-1414.
Computer Science
5
Atmospheric Composition, Biosphere, Climatology, Ozone, Primitive Earth Atmosphere, Atmospheric Chemistry, Carbon Dioxide Concentration, Earth Environment, Oxygen, Precambrian Period
Scientific paper
A coupled one-dimensional radiative-convective and photochemical model was developed to study the effects of a lower oxygen level on the climatology, ozone content, and the UV radiation at ground level for the Precambrian earth. It is found that relatively important temperature decreases are associated with the ozone changes linked to the progressive decrease of the oxygen level from the present atmospheric level to smaller levels. It is shown that the larger CO2 concentration in the ancient atmosphere could have contributed to strengthen the UV screening of ozone. The surface temperature response to the ozone decrease is examined and a possible evolutionary scenario of atmospheric O2 and CO2 is presented. The consequences of the research for the UV environment of the primitive biosphere is investigated with a quantitative model calculating bacterial survival rates.
François Louis M.
Gérard Jean-Claude
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