Abrupt changes in Indian summer monsoon strength during 33,800 to 5500years BP
Abrupt changes in Indian summer monsoon strength during 33,800 to 5500years BP
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DOI：
10.1002/2015gl064015
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发表时间：
2015-07-16
影响因子：
5.2
通讯作者：
Edwards, R. Lawrence
中科院分区：
文献类型：
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作者：
Dutt, Som;Gupta, Anil K.;Edwards, R. Lawrence
印度东北部洞穴沉积物代用记录反映了印度夏季风强度的季节变化以及水分来源和输送路径。为了更好地理解这些过程，我们分析了印度梅加拉亚Mawmluh洞穴的一个新的洞穴沉积记录。数据显示，在33，500 -32，500年B. P.之间存在一个强湿相，随后在26，000 - 23，500年B. P.之间存在一个弱/干相，在17，000 - 15，000年B. P.之间存在一个非常弱的相。我们推断，季风强度的这些变化是由温度梯度的变化驱动的，温度梯度的变化驱动风和水分输送到印度东北部。
Speleothem proxy records from northeastern (NE) India reflect seasonal changes in Indian summer monsoon strength as well as moisture source and transport paths. We have analyzed a new speleothem record from Mawmluh Cave, Meghalaya, India, in order to better understand these processes. The data show a strong wet phase 33,500-32,500years B.P. followed by a weak/dry phase from 26,000 to 23,500years B.P. and a very weak phase from 17,000 to 15,000years B.P. The record suggests abrupt increase in strength during the BOlling-AllerOd and early Holocene periods and pronounced weakening during the Heinrich and Younger Dryas cold events. We infer that these changes in monsoon strength are driven by changes in temperature gradients which drive changes in winds and moisture transport into northeast India.