2.8 Million Years of Arctic Climate Change from Lake El'gygytgyn, NE Russia
2.8 Million Years of Arctic Climate Change from Lake El'gygytgyn, NE Russia
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DOI：
10.1126/science.1222135
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发表时间：
2012-07-20
期刊：
影响因子：
56.9
通讯作者：
Wagner, Bernd
中科院分区：
文献类型：
--
作者：
Melles, Martin;Brigham-Grette, Julie;Wagner, Bernd
北极气候预测的可靠性目前受到过去对自然气候变异性认识不足的影响。来自俄罗斯东北部（NE）El'gygytgyn湖的沉积物岩心提供了过去280万年来北极的连续高分辨率记录。该岩芯揭示了第四纪期间的许多“超级间冰期”;对于海洋底栖同位素阶段（MIS）11 c和31，夏季最高温度和年降水量值类似于4度至5度C，比MIS 1和5e高出300毫米。气候模拟表明，这些极端温暖的条件很难单独用温室气体和天文强迫来解释，这意味着放大反馈和远场影响的重要性。相对于南极西部冰盖退缩，北极变暖的时间意味着强有力的半球间气候连通性。
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 similar to 4 degrees to 5 degrees C and similar to 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.