Computer Science
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..247o&link_type=abstract
Nature (ISSN 0028-0836), vol. 338, March 16, 1989, p. 247-249. Research supported by NASA.
Computer Science
52
Atmospheric Composition, Atmospheric Moisture, Bolides, Carbon Dioxide Concentration, Atmospheric Temperature, Greenhouse Effect
Scientific paper
Various observations and data demonstrate that sea level at the end of the Cretaceous was 150-200 m higher than at present, suggesting the possibility that the extinction bolide struck a shallow marine carbonate-rich sedimentary section. It is shown here that the impact of such a bolide (about 5 km in radius) onto a carbonate-rich terrane would increase the CO2 content of the atmosphere by a factor of two to ten. Additional dissolution of CO2 from the ocean's photic zone could release much larger quantities of CO2. The impact-induced release of CO2, by itself, would enhance atmospheric greenhouse heating and give rise to a worldwide increase in temperature from 2 K to 10 K for periods of 10,000 to 100,000 years.
Ahrens Thomas J.
O'Keefe John D.
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