Evolution of Chaka Salt Lake in NW China in response to climatic change during the Latest Pleistocene-Holocene

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	Evolution of Chaka Salt Lake in NW China in response to climatic change during the Latest Pleistocene-Holocene
	Liu Xingqi 1; Dong, Hailiang 2; Rech, Jason A.2; Matsumoto, Ryo 3; Bo, Yang 4; Wang Yongbo 1
	2008-04-01
发表期刊	QUATERNARY SCIENCE REVIEWS
卷号	27 期号:7-8 页码:867-879
摘要	The Late Pleistocene and Holocene hydrologic balance of Chaka Salt Lake in the eastern Qaidam Basin of NW China was studied based on the analysis of lithostratigraphy, mineralogy, total organic carbon, and total nitrogen from a 9.0-m long sediment core. An age-depth model for the lake sediments is based on eight accelerator mass spectrometry (AMS) C-14 measurements of organic matter and a 1700-year radiocarbon reservoir correction. The Pitzer model was used to calculate the sequence of minerals precipitated as a function of salinity assuming that the initial lake water was recharged from adjacent rivers and springs. Lake salinity values were derived from a good match between the calculated and observed mineral sequences. Our multi-proxy based hydrologic reconstruction of Chaka Lake indicates that it was a clastic-dominated, freshwater lake between 17.2 and 11.4 cal ka BP, which may have resulted from the input of glacial water into the lake at that time. During the Lateglacial and Holocene, a warm climatic regime predominated between 13.9 and 12.7 cal ka BP and then a cold climatic regime prevailed between 12.7 and 11.4 cat ka BP. These warm and cold periods correlate with the Bolling-Allerod and Younger Dryas events in the region. Beginning at 11.4 cal ka BP, a saline or hypersaline lake developed, which may have resulted from increased summer insolation and temperatures. These conditions persisted throughout the Holocene. Modeling indicates that lake salinity fluctuated between 66 and 223 ppt from 11.4 to 7.2 cal ka BP and then increased to 223-322 ppt between 7.2 and 6.0cal ka BP, when most regions of China recorded high moisture availability (i.e. the so-called "mid-Holocene Climatic Optimum"). Lake salinity decreased to 66-223 ppt during a short time period between 6.0 and 5.3 cal ka BP, possibly caused by reduced evaporation. Subsequently, salinity values rapidly increased to 223-322 ppt between 5.3 and 5.2 cal ka BP and a hypersaline take with a salinity higher than 324 ppt, similar to modern Chaka Salt Lake, became established around 5.2 cal ka BP. This establishment may have been related to the weakening of Asian monsoon. Regional comparisons of paleoclimatic records indicate that large temporal and spatial variations exist in the occurrence and intensity of drought over Western China since the Lateglacial. (C) 2008 Elsevier Ltd. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5850
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China 2.Miami Univ, Dept Geol, Oxford, OH 45056 USA 3.Univ Tokyo, Dept Earth & Planetary Sci, Tokyo 1130033, Japan 4.Chinese Acad Sci, Inst Salt Lakes, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Liu Xingqi,Dong, Hailiang,Rech, Jason A.,et al. Evolution of Chaka Salt Lake in NW China in response to climatic change during the Latest Pleistocene-Holocene[J]. QUATERNARY SCIENCE REVIEWS,2008,27(7-8):867-879.
APA	Liu Xingqi,Dong, Hailiang,Rech, Jason A.,Matsumoto, Ryo,Bo, Yang,&Wang Yongbo.(2008).Evolution of Chaka Salt Lake in NW China in response to climatic change during the Latest Pleistocene-Holocene.QUATERNARY SCIENCE REVIEWS,27(7-8),867-879.
MLA	Liu Xingqi,et al."Evolution of Chaka Salt Lake in NW China in response to climatic change during the Latest Pleistocene-Holocene".QUATERNARY SCIENCE REVIEWS 27.7-8(2008):867-879.