Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China
Atmospheric connections with the North Atlantic enhanced the deglacial warming in northeast China
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DOI：
10.1130/g39401.1
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Huan Yang
中科院分区：
文献类型：
--
作者：
Yanhong Zheng;Richard Pancost;Xiaodong Liu;Zhangzhang Wang;B.D.A. Naafs;Xiaoxun Xie;Zhao Liu;Xuefeng Yu;Huan Yang
Variations in atmospheric circulation across the last deglaciation.in the northernmost monsoon-influenced regions of Asia are not well.constrained, highlighting a fundamental gap in our understanding.of Asian climate. Here we reconstruct continental air temperatures.for northeast China across the last deglaciation (past 16 k.y.), based.on the distribution of bacterial branched glycerol dialkyl glycerol.tetraethers in a sequence of the Hani peat (Jilin Province, northeast.China). Our results indicate large (as much as 10 °C) oscillations in.temperature in northeast China across the deglaciation, oscillations.significantly larger than observed in other temperature records from.low-latitude or same-latitude East Asia, but consistent with climate.model simulations. This enhanced magnitude, as well as the timing.of temperature variations, provides evidence for atmospheric teleconnections.with high latitudes; in particular, we suggest that highlatitude.cooling associated with Arctic ice expansion and changes in.Atlantic Meridional Overturning Circulation enhanced the intensity.and lowered the temperature of Eurasian mid-latitude westerlies and.northwesterly winds over East Asia during the last glacial, delivering.cold air masses to northeast China. During the deglaciation the westerlies.and therefore delivery of cold air masses weakened, amplifying.the deglacial warming in this region. We conclude that changes in.North Atlantic climate had a particularly strong impact on the northernmost.parts of the East Asian monsoon–influenced area.
