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| Titel |
Diminished greenhouse warming from Archean methane due to solar absorption lines |
| VerfasserIn |
B. Byrne, C. Goldblatt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 3 ; Nr. 11, no. 3 (2015-03-27), S.559-570 |
| Datensatznummer |
250117216
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| Publikation (Nr.) |
 copernicus.org/cp-11-559-2015.pdf |
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| Zusammenfassung |
| Previous research has shown that methane may have been sustained at
high concentrations in the Archean atmosphere, helping to offset lower
insolation and solve the faint young sun problem. However, recent
updates to the HITRAN (High-Resolution Transmission) line database have significantly increased the
shortwave absorption by CH4 in comparison to older versions
of the database (e.g. HITRAN 2000). Here we investigate the
climatological implications of strong shortwave CH4
absorption in an Archean atmosphere rich in CH4. We show
that the surface warming at CH4 abundances >10-3 is
diminished relative to the HITRAN 2000 line data. Strong
shortwave absorption also results in a~warm stratosphere and lower
tropopause. We discuss these results in the context of contemporary
research on the Archean climate and how these results could affect the
formation of stratospheric clouds and an organic haze. |
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