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|a Pliocene Warmth, Polar Amplification, and Stepped Pleistocene Cooling Recorded in NE Arctic Russia |h [electronic resource]. |
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|a [S.l.] : |b American Association for the Advancement of Science, |c 2013. |
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|a Science Magazine Volume 340. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Understanding the evolution of Arctic polar climate from the protracted warmth of the middle
Pliocene into the earliest glacial cycles in the Northern Hemisphere has been hindered by the lack
of continuous, highly resolved Arctic time series. Evidence from Lake El’gygytgyn, in northeast
(NE) Arctic Russia, shows that 3.6 to 3.4 million years ago, summer temperatures were ~8°C
warmer than today, when the partial pressure of CO2 was ~400 parts per million. Multiproxy
evidence suggests extreme warmth and polar amplification during the middle Pliocene, sudden
stepped cooling events during the Pliocene-Pleistocene transition, and warmer than present Arctic
summers until ~2.2 million years ago, after the onset of Northern Hemispheric glaciation. Our data
are consistent with sea-level records and other proxies indicating that Arctic cooling was
insufficient to support large-scale ice sheets until the early Pleistocene. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a. |z Northern Hemisphere |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042662/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/26/62/00001/FI15042662_thm.jpg |
