Document Detail

Hydrogen-nitrogen greenhouse warming in Earth's early atmosphere.
MedLine Citation:
PMID:  23288536     Owner:  NLM     Status:  In-Data-Review    
Understanding how Earth has sustained surface liquid water throughout its history remains a key challenge, given that the Sun's luminosity was much lower in the past. Here we show that with an atmospheric composition consistent with the most recent constraints, the early Earth would have been significantly warmed by H(2)-N(2) collision-induced absorption. With two to three times the present-day atmospheric mass of N(2) and a H(2) mixing ratio of 0.1, H(2)-N(2) warming would be sufficient to raise global mean surface temperatures above 0°C under 75% of present-day solar flux, with CO(2) levels only 2 to 25 times the present-day values. Depending on their time of emergence and diversification, early methanogens may have caused global cooling via the conversion of H(2) and CO(2) to CH(4), with potentially observable consequences in the geological record.
Robin Wordsworth; Raymond Pierrehumbert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  339     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  64-7     Citation Subset:  IM    
Department of Geological Sciences, University of Chicago, Chicago, IL 60637, USA.
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Comment In:
Science. 2013 Jan 4;339(6115):44-5   [PMID:  23288532 ]

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