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  North Pacific seasonality and the glaciation of North America 2.7 million years ago

Haug, G. H., Ganopolski, A., Sigman, D. M., Rosell-Mele, A., Swann, G. E. A., Tiedemann, R., Jaccard, S. L., Bollmann, J., Maslin, M. A., Leng, M. J., Eglinton, G. (2005): North Pacific seasonality and the glaciation of North America 2.7 million years ago. - Nature, 433, 7028, 821-825.
https://doi.org/10.1038/nature03332

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Haug, G. H.1, Autor
Ganopolski, A.1, Autor
Sigman, D. M.1, Autor
Rosell-Mele, A.1, Autor
Swann, G. E. A.1, Autor
Tiedemann, R.1, Autor
Jaccard, S. L.1, Autor
Bollmann, J.1, Autor
Maslin, M. A.1, Autor
Leng, M. J.1, Autor
Eglinton, G.1, Autor
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, Autor              
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1External Organizations, ou_persistent22              

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 DDC: 550 - Earth sciences
 Zusammenfassung: In the context of gradual Cenozoic cooling, the timing of the onset of significant Northern Hemisphere glaciation 2.7 million years ago is consistent with Milankovitch’s orbital theory, which posited that ice sheets grow when polar summertime insolation and temperature are low. However, the role of moisture supply in the initiation of large Northern Hemisphere ice sheets has remained unclear. The subarctic Pacific Ocean represents a significant source of water vapour to boreal North America, but it has been largely overlooked in efforts to explain Northern Hemisphere glaciation. Here we present alkenone unsaturation ratios and diatom oxygen isotope ratios from a sediment core in the western subarctic Pacific Ocean, indicating that 2.7 million years ago latesummer sea surface temperatures in this ocean region rose in response to an increase in stratification. At the same time, winter sea surface temperatures cooled, winter floating ice became more abundant and global climate descended into glacial conditions. We suggest that the observed summer warming extended into the autumn, providing water vapour to northern North America, where it precipitated and accumulated as snow, and thus allowed the initiation of Northern Hemisphere glaciation.

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 Datum: 2005
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: eDoc: 6126
GFZPOF: 3.0 Klimavariabilität und Lebensraum des Menschen
DOI: 10.1038/nature03332
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Titel: Nature
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 433 (7028) Artikelnummer: - Start- / Endseite: 821 - 825 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals353