DOI: 10.5194/tc-15-95-2021
论文题名: Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s
作者: Singh N. ; Shekhar M. ; Singh J. ; Gupta A.K. ; Bräuning A. ; Mayr C. ; Singhal M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 95
结束页码: 112
语种: 英语
英文关键词: acceleration
; climate variation
; dominance
; glacier mass balance
; heterogeneity
; monsoon
; oxygen isotope
; proxy climate record
; reconstruction
; regional climate
; tree ring
; Arabian Sea
; Himalayas
; Indian Ocean
英文摘要: Tree-ring 18O values are a sensitive proxy for regional physical climate, while their 13C values are a strong predictor of local ecohydrology. Utilizing available ice-core and tree-ring 18O records from the central Himalaya (CH), we found an increase in east?west climate heterogeneity since the 1960s. Further, 13C records from transitional western glaciated valleys provide a robust basis for reconstructing about 3 centuries of glacier mass balance (GMB) dynamics. We reconstructed annually resolved GMB since 1743 CE based on regionally dominant tree species of diverse plant functional types. Three major phases became apparent: positive GMB up to the mid-19th century, the middle phase (1870?1960) of slightly negative but stable GMB, and an exponential ice mass loss since the 1960s. Reasons for accelerated mass loss are largely attributed to anthropogenic climate change, including concurrent alterations in atmospheric circulations (weakening of the westerlies and the Arabian Sea branch of the Indian summer monsoon). Multi-decadal isotopic and climate coherency analyses specify an eastward declining influence of the westerlies in the monsoon-dominated CH region. Besides, our study provides a long-term context for recent GMB variability, which is essential for its reliable projection and attribution. © 2021 BMJ Publishing Group. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164808
Appears in Collections: 气候变化与战略
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作者单位: Centre for Glaciology, Wadia Institute of Himalayan Geology, Dehradun, 248001, India; Birbal Sahni Institute of Palaeosciences, Lucknow, 226007, India; Wadia Institute of Himalayan Geology, Dehradun, 248001, India; Department of Geology and Geophysics, IIT Kharagpur, Kharagpur, 721302, India; Institute of Geography, University of Erlangen-Nuremberg, Erlangen, 91058, Germany
Recommended Citation:
Singh N.,Shekhar M.,Singh J.,et al. Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s[J]. Cryosphere,2021-01-01,15(1)