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

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 DDC: 550 - Earth sciences
 Abstract: 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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 Dates: 2005
 Publication Status: Finally published
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 Identifiers: eDoc: 6126
GFZPOF: 3.0 Klimavariabilität und Lebensraum des Menschen
DOI: 10.1038/nature03332
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Title: Nature
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Pages: - Volume / Issue: 433 (7028) Sequence Number: - Start / End Page: 821 - 825 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals353