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2.8 Million Years of Arctic Climate Change from Lake El’gygytgyn, NE Russia

zhaochen17 添加于 2017/4/5 16:50:34  217次阅读 | 0次推荐 | 0个评论

The reliability of Arctic climate predictions is currently hampered by insufficient knowledge of natural climate variability in the past. A sediment core from Lake El’gygytgyn in northeastern (NE) Russia provides a continuous, high-resolution record from the Arctic, spanning the past 2.8 million years. This core reveals numerous “super interglacials” during the Quaternary; for marine benthic isotope stages (MIS) 11c and 31, maximum summer temperatures and annual precipitation values are ~4° to 5°C and ~300 millimeters higher than those of MIS 1 and 5e. Climate simulations show that these extreme warm conditions are difficult to explain with greenhouse gas and astronomical forcing alone, implying the importance of amplifying feedbacks and far field influences. The timing of Arctic warming relative to West Antarctic Ice Sheet retreats implies strong interhemispheric climate connectivity.

作 者:Martin Melles, Julie Brigham-Grette, Pavel S. Minyuk, Norbert R. Nowaczyk, Volker Wennrich,
期刊名称: Science
期卷页: 2012 第337卷 第315期 315~320页
学科领域:地球科学 » 地理学 » 自然地理学
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原文链接:http://science.sciencemag.org/content/337/6092/315
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