Physics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37..207k&link_type=abstract
Icarus, vol. 37, Jan. 1979, p. 207-213.
Physics
43
Ammonia, Greenhouse Effect, Outgassing, Photolysis, Primitive Earth Atmosphere, Solar Heating, Chemical Evolution, Photodissociation, Radiation Effects, Reaction Kinetics, Solar Radiation, Surface Temperature, Temperature Effects, Time Constant
Scientific paper
Photochemical calculations indicate that in the prebiotic atmosphere of earth ammonia would have been irreversibly converted to N2 in less than 40 years if the ammonia surface mixing ratio were no more than 0.0001. However, if a continuous outgassing of ammonia were maintained, radiative-equilibrium calculations indicate that a surface mixing ratio of ammonia of 0.0001 or greater would provide a sufficient greenhouse effect to keep the surface temperature above freezing. With a 0.0001 mixing ratio of ammonia, 60% to 70% of the present-day solar luminosity would be adequate to maintain surface temperatures above freezing. A lower limit to the time constant for accumulation of an amount of nitrogen equivalent to the present day value is 10 my if the outgassing were such as to provide a continuous surface mixing ratio of ammonia of at least 0.00001.
Atreya Sushil K.
Kuhn William R.
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