Journal article Open Access

Climatic consequences of very high carbon dioxide levels in the earth's early atmosphere

Kasting, J.; Ackerman, T.

The possible consequences of very high carbon dioxide concentrations in the earth's early atmosphere have been investigated with a radiative-convective climate model. The early atmosphere would apparently have been stable against the onset of a runaway greenhouse (that is, the complete evaporation of the oceans) for carbon dioxide pressures up to at least 100 bars. A 10- to 20-bar carbon dioxide atmosphere, such as may have existed during the first several hundred million years of the earth's history, would have had a surface temperature of approximately 85 degrees to 110 degrees C. The early stratosphere should have been dry, thereby precluding the possibility of an oxygenic prebiotic atmosphere caused by photodissociation of water vapor followed by escape of hydrogen to space. Earth's present atmosphere also appears to be stable against a carbon dioxide-induced runaway greenhouse.

Files (806.2 kB)
Name Size
article.pdf
md5:89cc80ca7f24e600cfc874e7b86cb1ec
806.2 kB Download
32
32
views
downloads
Views 32
Downloads 32
Data volume 25.8 MB
Unique views 32
Unique downloads 31

Share

Cite as