DOI: 10.1016/j.quascirev.2013.09.004
Scopus记录号: 2-s2.0-84884933653
论文题名: Last glacial maximum climate based on cosmogenic 10Be exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau
作者: Xu X. ; Hu G. ; Qiao B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 80 起始页码: 91
结束页码: 101
语种: 英语
英文关键词: Cosmogenic 10Be exposure dating
; Glacier modeling
; Last Glacial Maximum
; Paleoclimate
; Tashkurgan Valley
Scopus关键词: Climatic conditions
; Cosmogenic
; Equilibrium line altitudes
; Last Glacial Maximum
; Moraine boulders
; Paleoclimates
; Tashkurgan Valley
; Tibetan Plateau
; Landforms
; Glacial geology
; climate change
; dating method
; estimation method
; glacial environment
; ice flow
; Last Glacial Maximum
; mass balance
; moraine
; paleoclimate
; China
; Qinghai-Xizang Plateau
英文摘要: Fully understanding the timing and climate of Last Glacial Maximum (LGM) is still lack in the head of the Tashkurgan Valley, northwest Tibetan Plateau (TP). The recent improvements in cosmogenic 10Be exposure dating and glacier modeling present an opportunity to estimate the LGM climatic conditions. In the paper, we investigated the moraines and used the 10Be exposure dating on the moraine boulders to constrain the timing of the LGM, the Kuzigun glacial stage in the head of the Tashkurgan Valley. Then, we used a coupled mass-balance and ice-flow model to quantify the paleoclimate from past glacier extents constrained by mapped and dated Kuzigun glacial moraines in the area. We showed that the glaciers terminated at an elevation of 4100-4200masl during the Kuzigun glacial stage and the glacial stage occurred during or slightly before 15-23ka, corresponding to the timing of the global LGM. The modeled mass balances indicated that present-day equilibrium line altitude (ELA) ranges from 5150 to 5250masl, and LGM ELA is between 4550 and 4600masl in the area, suggesting an ELA lowering of ~600m during the LGM. Model results suggested that the temperature during the LGM in the head of the Tashkurgan Valley is 5-8°C colder than today, considering a 30-70% reduction in precipitation compared to today. The paleoclimate estimates are generally consistence with previous studies that showed the LGM climate was colder and drier than today on the TP. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60465
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, Beijing, China; Graduate University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Xu X.,Hu G.,Qiao B.. Last glacial maximum climate based on cosmogenic 10Be exposure ages and glacier modeling for the head of Tashkurgan Valley, northwest Tibetan Plateau[J]. Quaternary Science Reviews,2013-01-01,80