Abrupt changes in Indian summer monsoon strength during 33,800 to 5500years BP

作者：Dutt Som; Gupta Anil K^*; Clemens Steven C; Cheng Hai; Singh Raj K; Kathayat Gayatri; Edwards R Lawrence

来源：Geophysical Research Letters, 2015, 42(13): 5526-5532.

DOI：10.1002/2015GL064015

• Indian summer monsoon
• precipitation
• Mawmluh Cave
• speleothem
• oxygen isotopes

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.

• 出版日期2015-7-16
• 单位西安交通大学