Paleozoic Atmospheric CO_2: Importance of Solar Radiation and Plant Evolution

Details Paleozoic Atmospheric CO_2: Importance of Solar Radiation and Plant Evolution Paleozoic Atmospheric CO_2: Importance of Solar Radiation and Plant Evolution

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261...68b&link_type=abstract

Science, Volume 261, Issue 5117, pp. 68-70

Mathematics

Logic

17

Scientific paper

Changes in solar radiation, as it affects the rate of weathering of silicates on the continents, and other changes involving weathering and the degassing of carbon dioxide (CO_2) have been included in a long-term carbon-cycle model. These additions to the model show that the major controls on CO_2 concentrations during the Paleozoic era were solar and biological, and not tectonic, in origin. The model predictions agree with independent estimates of a large mid-Paleozoic (400 to 320 million years ago) drop in CO_2 concentrations, which led to large-scale glaciation. This agreement indicates that variations in the atmospheric greenhouse effect were important in global climate change during the distant geologic past.

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