On the causes of Arctic sea ice in the warm Early Pliocene View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Caroline Clotten, Ruediger Stein, Kirsten Fahl, Michael Schreck, Bjørg Risebrobakken, Stijn De Schepper

ABSTRACT

Scattered and indirect evidence suggests that sea ice occurred as far south as the Iceland Sea during the Early Pliocene, when the global climate was warmer than present. However, conclusive evidence as well as potential mechanisms governing sea ice occurrence outside the Arctic Ocean during a time with elevated greenhouse gas concentrations are still elusive. Here we present a suite of organic biomarkers and palynological records from the Iceland Sea and Yermak Plateau. We show that sea ice appeared as early as ~4.5 Ma in the Iceland Sea. The sea ice either occurred seasonally or was transported southward with the East Greenland Current. The Yermak Plateau mostly remained free of sea ice and was influenced dominantly by Atlantic water. From ~4.0 Ma, occurrence of extended sea ice conditions at both the Yermak Plateau and Iceland Sea document a substantial expansion of sea ice in the Arctic. The expansion occurred contemporaneous with increased northward heat and moisture transport in the North Atlantic region, which likely led to a fresher Arctic Ocean that favors sea ice formation. This extensive sea ice cover along the pathway of the East Greenland Current gradually isolated Greenland from warmer Atlantic water in the Late Pliocene, providing a positive feedback for ice sheet expansion in Greenland. More... »

PAGES

989

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-018-37047-y

DOI

http://dx.doi.org/10.1038/s41598-018-37047-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1111771377

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30700730


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This table displays all metadata directly associated to this object as RDF triples.

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