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| Titel |
Obliquity forcing of low-latitude climate |
| VerfasserIn |
J. H. C. Bosmans, F. J. Hilgen, E. Tuenter, L. J. Lourens |
| 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. 10 ; Nr. 11, no. 10 (2015-10-09), S.1335-1346 |
| Datensatznummer |
250117434
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| Publikation (Nr.) |
 copernicus.org/cp-11-1335-2015.pdf |
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| Zusammenfassung |
| The influence of obliquity, the tilt of the Earth's rotational axis, on
incoming solar radiation at low latitudes is small, yet many tropical and
subtropical palaeoclimate records reveal a clear obliquity signal. Several
mechanisms have been proposed to explain this signal, such as the remote
influence of high-latitude glacials, the remote effect of insolation changes
at mid- to high latitudes independent of glacial cyclicity, shifts in the
latitudinal extent of the tropics, and changes in latitudinal insolation
gradients. Using a sophisticated coupled ocean–atmosphere global climate
model, EC-Earth, without dynamical ice sheets, we performed two idealized
experiments of obliquity extremes. Our results show that obliquity-induced
changes in tropical climate can occur without high-latitude ice sheet
fluctuations. Furthermore, the tropical circulation changes are consistent
with obliquity-induced changes in the cross-equatorial insolation gradient,
suggesting that this gradient may be used to explain obliquity signals in
low-latitude palaeoclimate records instead of the classical 65° N summer
insolation curve. |
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