DOI: 10.1002/2015GL064015
论文题名: Abrupt changes in Indian summer monsoon strength during 33,800 to 5500years B.P.
作者: Dutt S. ; Gupta A.K. ; Clemens S.C. ; Cheng H. ; Singh R.K. ; Kathayat G. ; Lawrence Edwards R.
刊名: Geophysical Research Letters
ISSN: 0094-9358
EISSN: 1944-9089
出版年: 2015
卷: 42, 期: 13 起始页码: 5526
结束页码: 5532
语种: 英语
英文关键词: Indian summer monsoon
; Mawmluh Cave
; oxygen isotopes
; precipitation
; speleothem
Scopus关键词: Caves
; Digital storage
; Glacial geology
; Isotopes
; Moisture
; Precipitation (chemical)
; Indian summer monsoon
; Moisture sources
; Moisture transport
; Monsoon strength
; Northeast india
; Oxygen isotopes
; Seasonal changes
; Speleothem
; Atmospheric thermodynamics
; Allerod
; Bolling
; Heinrich event
; moisture content
; monsoon
; paleoclimate
; precipitation (climatology)
; proxy climate record
; seasonal variation
; speleothem
; temperature gradient
; Younger Dryas
; India
; Meghalaya
英文摘要: 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 Bølling-Allerød 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. Key Points Longest record of summer precipitation from speleothem from India Abrupt changes in summer monsoon precipitation Less precipitation during Younger Dryas and Heinrich events. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938216885&doi=10.1002%2f2015GL064015&partnerID=40&md5=0f1a2ae481fb1c4dc9ae756f6c76c420
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8973
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Wadia Institute of Himalayan Geology, Dehradun, India
Recommended Citation:
Dutt S.,Gupta A.K.,Clemens S.C.,et al. Abrupt changes in Indian summer monsoon strength during 33,800 to 5500years B.P.[J]. Geophysical Research Letters,2015-01-01,42(13).