書誌事項
- 公開日
- 1982-04-20
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/jc087ic04p03091
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>A one‐dimensional photochemical model is used to calculate the rate at which ammonia would have been destroyed in the earth's atmosphere for assumed NH<jats:sub>3</jats:sub> mixing ratios of 10<jats:sup>−8</jats:sup> to 10<jats:sup>−4</jats:sup>. The calculated NH<jats:sub>3</jats:sub> destruction rates are then compared with possible abiotic and biotic sources for ammonia. Abiotic sources were probably sufficient to maintain the NH<jats:sub>3</jats:sub> mixing ratio of 10<jats:sup>−8</jats:sup> needed for life to have evolved but were too small to sustain the mixing ratios of 10<jats:sup>−5</jats:sup> or more necessary to produce significant greenhouse warming. The atmospheric ammonia concentration may have increased during the Archean as a result of biological activities but probably remained below the level required to generate measurable thermal effects.</jats:p>
収録刊行物
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- Journal of Geophysical Research: Oceans
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Journal of Geophysical Research: Oceans 87 (C4), 3091-3098, 1982-04-20
American Geophysical Union (AGU)