气候变化领域集成服务门户(CCPortal): Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s

CCPortal

DOI	10.5194/tc-15-95-2021
	Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s
	Singh N.; Shekhar M.; Singh J.; Gupta A.K.; Bräuning A.; Mayr C.; Singhal M.
发表日期	2021
ISSN	19940416
起始页码	95
结束页码	112
卷号	15 期号:1
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.
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
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202430
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
推荐引用方式 GB/T 7714	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],2021,15(1).
APA	Singh N..,Shekhar M..,Singh J..,Gupta A.K..,Bräuning A..,...&Singhal M..(2021).Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s.Cryosphere,15(1).
MLA	Singh N.,et al."Central Himalayan tree-ring isotopes reveal increasing regional heterogeneity and enhancement in ice mass loss since the 1960s".Cryosphere 15.1(2021).