globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.07.017
Scopus记录号: 2-s2.0-85026247706
论文题名:
Rapid and punctuated Late Holocene recession of Siling Co, central Tibet
作者: Shi X.; Kirby E.; Furlong K.P.; Meng K.; Robinson R.; Lu H.; Wang E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 172
起始页码: 15
结束页码: 31
语种: 英语
英文关键词: Asian monsoon ; Holocene abrupt climate change ; Holocene lake level fluctuations ; Hydrologic index ; Siling Co shorelines ; Tibetan Plateau
Scopus关键词: Atmospheric thermodynamics ; Deposits ; Geochronology ; Isotopes ; Lakes ; Luminescence ; Abrupt climate change ; Asian monsoon ; Hydrologic indices ; Lake level fluctuations ; Siling Co shorelines ; Tibetan Plateau ; Climate change
英文摘要: Variations in the strength of the Asian monsoon during Holocene time are thought to have been associated with widespread changes in precipitation across much of Tibet. Local records of monsoon strength from cave deposits, ice cores, and lake sediments typically rely on proxy data that relate isotopic variations to changes in precipitation. Lake expansion and contraction in response to changing water balance are likewise inferred from sedimentologic, isotopic and paleobiologic proxies, but relatively few direct records of changes in lake volume from preserved shorelines exist. Here we utilize relict shoreline deposits and associated alluvial fan features around Siling Co, the largest lake in central Tibet, to reconstruct centennial-to-millennial-scale variations in lake area and volume over the Holocene. Mapping and surveying of lacustrine shorelines coupled with optically stimulated luminescence dating of associated deposits indicate protracted occupation of a highstand elevation from >8 ka to 4 ka, followed by rapid recession that was likely punctuated by several stillstands of centennial-scale duration. Calculation of the changes in lake surface area and past hydrologic indices of the Siling Co basin suggests the effective moisture during the early Holocene highstand was approximately three times greater than today. In contrast to other lakes in central and western Tibet, our results suggest that Siling Co did not begin to recede synchronously with decreasing solar insolation at ca. 9–8 ka. Rather, initial recession of Siling Co appears to correspond to a time period of enhanced aridity and weakened monsoon in both Africa and Asia at ca. 4.2 ka. Our results add to a growing body of literature that suggest a period of relatively severe aridity on the Tibetan Plateau at this time. We suggest that subsequent punctuated recession of Siling Co was punctuated by similar periods of abrupt climate change during the Late Holocene. © 2017 The Authors
资助项目: This work was supported by a National Science Foundation grant from the Tectonics program (EAR-0911587) to E.K. and K.P.F. Additional support to E.W. was provided by grants from the Chinese Academy of Sciences (XDB03010500). X.S. also thanks the support from the Earth Observatory of Singapore, Nanyang Technological University through its funding from the National Research Foundation Singapore and the Singapore Ministry of Education under the Research Centers of Excellence initiative. This work comprises Earth Observatory of Singapore contribution number 158. We are grateful to Tashi Wangdi and Feng Qu for assistance with the field work. Dr. Xianfeng Wang provided some feedbacks on an early version of the manuscript. We thank Editor Ana Moreno for the editorial handling of this paper, and thank Adam Hudson and one anonymous reviewer for providing constructive comments that helped improve the quality of this paper. We declare no financial interests among the authors. Supporting data can be accessed in the Supporting Material file.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59119
Appears in Collections:过去全球变化的重建

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作者单位: Earth Observatory of Singapore, Nanyang Technological University, Singapore; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA, United States; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Department of Earth and Environmental Sciences, University of St Andrews, St Andrews, United Kingdom; Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China

Recommended Citation:
Shi X.,Kirby E.,Furlong K.P.,et al. Rapid and punctuated Late Holocene recession of Siling Co, central Tibet[J]. Quaternary Science Reviews,2017-01-01,172
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