Computer Science
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..305f&link_type=abstract
Nature (ISSN 0028-0836), vol. 319, Jan. 23, 1986, p. 305-308.
Computer Science
57
Atmospheric Chemistry, Chemical Evolution, Formaldehyde, Hydrocyanic Acid, Meteoritic Damage, Primitive Earth Atmosphere, Abundance, Atmospheric Composition, Bolides, Chemical Equilibrium, Shock Heating, Thermochemistry
Scientific paper
The production of HCN and H2CO by large impacts on the earth's primitive atmosphere is modelled using thermochemical equilibrium and chemical kinetic calculations of the composition of shocked air parcels for a wide range of temperatures, pressures, and initial compositions. For atmospheres with C/O of one or more, the results suggest that bolide impacts cause HCN volume mixing ratios of approximately 10 to the -3rd to -5th in the impact region and global average ratios of 10 to the -5th to the -12th. The corresponding H2CO mixing ratios in the impact region are 10 to the -7th to -9th; nonglobal mixing can occur, however, as H2CO is rapidly destroyed or rained out of the atmosphere within days to hours. Rainout to the oceans of 3-15 percent of the HCN produced can provide 3-14 x 10 to the 11th mol HCN per year.
Fegley Bruce Jr.
Hartman Henrik
Prinn Ronald G.
Watkins G. H.
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