| Earth's early atmosphere. | |
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MedLine Citation:
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PMID: 11536547 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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Ideas about atmospheric composition and climate on the early Earth have evolved considerably over the last 30 years, but many uncertainties still remain. It is generally agreed that the atmosphere contained little or no free oxygen initially and that oxygen concentrations increased markedly near 2.0 billion years ago, but the precise timing of and reasons for its rise remain unexplained. Likewise, it is usually conceded that the atmospheric greenhouse effect must have been higher in the past to offset reduced solar luminosity, but the levels of atmospheric carbon dioxide and other greenhouse gases required remain speculative. A better understanding of past atmospheric evolution is important to understanding the evolution of life and to predicting whether Earth-like planets might exist elsewhere in the galaxy. |
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Authors:
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J F Kasting |
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Publication Detail:
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Type: Journal Article; Review |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 259 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1993 Feb |
Date Detail:
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Created Date: 1995-06-16 Completed Date: 1995-06-16 Revised Date: 2007-03-19 |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 920-6 Citation Subset: S |
Affiliation:
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Department of Geosciences, The Pennsylvania State University, University Park 16802. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Atmosphere* Biogenesis* Carbon Dioxide / analysis Climate Earth (Planet)* Oceans and Seas Oxygen / analysis Ozone Time Factors Water |
| Chemical | |
Reg. No./Substance:
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10028-15-6/Ozone; 124-38-9/Carbon Dioxide; 7732-18-5/Water; 7782-44-7/Oxygen |
| Investigator | |
Investigator/Affiliation:
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J F Kasting / Penn St Univ, University Park, Dept Geosciences |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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