Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992msat.work...69h&link_type=abstract
In Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time p 69 (SEE N92-28988 19-91)
Other
Atmospheric Composition, Atmospheric Heating, Greenhouse Effect, Hydrocyanic Acid, Mars Atmosphere, Nitrogen Oxides, Opacity, Trace Elements, Infrared Radiation, Infrared Spectra, Infrared Windows, Outgassing, Surface Temperature, Volcanoes, Water
Scientific paper
The early atmospheres of Earth and Mars were non-oxidizing mixtures likely derived from volcanic outgassing of a silicate mantle, with some fraction of the volatiles also contributed by impacting comets and meteorites. Here the authors investigate the potential of minor atmospheric constituents produced by ultraviolet and auroral chemistry to contribute to the thermal opacity of early Earth and Mars atmospheres. Using a very simple two-stream thermal opacity model, the authors show that HCN at 10 parts per million (ppm) and N2O at 100 ppm can each block radiation in thermal infrared windows sufficiently to increase the surface temperature by 7 K separately, or 14 K together. Small quantities of other species are also produced in such experiments. Some of these have especially complex infrared spectra and should be further investigated for their potential to help close windows in the CO2 + H2O infrared transmission. Enhancement of greenhouse warming by minor atmospheric species different from those present in today's atmosphere may have played important roles in the climate of early Earth and Mars.
Heinrich Michael N.
Reid Thompson W.
Sagan Carl
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