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A balmy Arctic

Analyses of sediments retrieved from a drifting ice island suggest that the Arctic Ocean may have been ice free and as warm as 15 °C about 70 million years ago. Therein is a challenge for climate models.

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Figure 1: Average annual sea surface temperature for the Cretaceous predicted by an ocean–atmosphere climate model.


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Poulsen, C. A balmy Arctic. Nature 432, 814–815 (2004).

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