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| Titel |
Tropical cooling and the onset of North American glaciation |
| VerfasserIn |
P. Huybers, P. Molnar |
| 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 ; 3, no. 3 ; Nr. 3, no. 3 (2007-09-13), S.549-557 |
| Datensatznummer |
250001081
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| Publikation (Nr.) |
 copernicus.org/cp-3-549-2007.pdf |
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| Zusammenfassung |
| We offer a test of the idea that gradual cooling in the eastern
tropical Pacific led to cooling of North America and the initiation
of glaciation ~3 Myr ago. Using modern climate data we estimate
how warming of the eastern tropical Pacific affects North American
temperature and ice-ablation. Assuming that the modern relationship
holds over the past millions of years, a ~4°C warmer
eastern tropical Pacific between 3–5 Ma would increase ablation in
northern North America by approximately two meters per year. By
comparison, a similar estimate of the ablation response to
variations in Earth's obliquity gives less than half the magnitude
of the tropically-induced change. Considering that variations in
Earth's obliquity appear sufficient to initiate glaciations between
~1–3 Ma, we infer that the warmer eastern equatorial Pacific
prior to 3 Ma suffices to preclude glaciation. |
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