Timing of Late Quaternary palaeolake evolution in Tengger Desert ofnorthern China and its possible forcing mechanisms

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	Timing of Late Quaternary palaeolake evolution in Tengger Desert ofnorthern China and its possible forcing mechanisms
	Long, Hao; Lai, ZhongPing; Fuchs, Markus; Zhang, JingRan; Li, Yu
	2012
发表期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
卷号	92-93 期号:*页码:119-129
关键词	Late Quaternary Tengger Desert In Northern chIna Osl Dating
摘要	Palaeolake evolution history has been used to reconstruct the Late Quaternary environmental and climatic conditions in East Asian monsoon area. In this study, based on the OSL chronology (33 samples) and the stratigraphy of shorelines or lacustrine sequences, we reconstructed the Late Quaternary evolution history of the Zhuyeze palaeolake surrounded by the Tengger Desert at the northern edge of East Asian summer monsoon. The luminescence dating results with geomorphologic analysis indicate that: (1) contrary to previous interpretations on MIS 3 mega-lake derived from C-14 chronology, highstands of ca. 30 m above modem playa are OSL dated to around 90-80 ka (MIS 5a), and no evidence of MIS 3 highstands has been found, which questions the previous climate pattern of 'uniquely warm and wet Late MIS 3' in northwestern China. The high insolation at MIS 5a triggered the strengthened summer monsoon which brought more rainfall to the study area, causing the highstand in Zhuyeze; (2) a substantial lake with a water level of ca. 20 m above the modern playa was present during 8.0-5.0 ka (Mid-Holocene), indicating that the wettest stage of the Holocene occurred in the Mid-Holocene. This reconstructed moisture pattern based on lake levels in East Asian monsoon marginal area is out of phase with that in monsoon core area, and we propose that this is possibly related to low sea level during the Early Holocene leading to the study area out of East Asian monsoon influence; (3) the shrinking process of Zhuyeze lake since 5.0 ka indicate the drying trend during the Late Holocene, responding directly to the changes of the East Asian monsoon triggered by summer insolation at low latitude areas. (C) 2012 Elsevier B.V. All rights reserved. Palaeolake evolution history has been used to reconstruct the Late Quaternary environmental and climatic conditions in East Asian monsoon area. In this study, based on the OSL chronology (33 samples) and the stratigraphy of shorelines or lacustrine sequences, we reconstructed the Late Quaternary evolution history of the Zhuyeze palaeolake surrounded by the Tengger Desert at the northern edge of East Asian summer monsoon. The luminescence dating results with geomorphologic analysis indicate that: (1) contrary to previous interpretations on MIS 3 mega-lake derived from C-14 chronology, highstands of ca. 30 m above modem playa are OSL dated to around 90-80 ka (MIS 5a), and no evidence of MIS 3 highstands has been found, which questions the previous climate pattern of 'uniquely warm and wet Late MIS 3' in northwestern China. The high insolation at MIS 5a triggered the strengthened summer monsoon which brought more rainfall to the study area, causing the highstand in Zhuyeze; (2) a substantial lake with a water level of ca. 20 m above the modern playa was present during 8.0-5.0 ka (Mid-Holocene), indicating that the wettest stage of the Holocene occurred in the Mid-Holocene. This reconstructed moisture pattern based on lake levels in East Asian monsoon marginal area is out of phase with that in monsoon core area, and we propose that this is possibly related to low sea level during the Early Holocene leading to the study area out of East Asian monsoon influence; (3) the shrinking process of Zhuyeze lake since 5.0 ka indicate the drying trend during the Late Holocene, responding directly to the changes of the East Asian monsoon triggered by summer insolation at low latitude areas. (C) 2012 Elsevier B.V. All rights reserved.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2036
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Long, Hao,Lai, ZhongPing,Fuchs, Markus,et al. Timing of Late Quaternary palaeolake evolution in Tengger Desert ofnorthern China and its possible forcing mechanisms[J]. GLOBAL AND PLANETARY CHANGE,2012,92-93(*):119-129.
APA	Long, Hao,Lai, ZhongPing,Fuchs, Markus,Zhang, JingRan,&Li, Yu.(2012).Timing of Late Quaternary palaeolake evolution in Tengger Desert ofnorthern China and its possible forcing mechanisms.GLOBAL AND PLANETARY CHANGE,92-93(*),119-129.
MLA	Long, Hao,et al."Timing of Late Quaternary palaeolake evolution in Tengger Desert ofnorthern China and its possible forcing mechanisms".GLOBAL AND PLANETARY CHANGE 92-93.*(2012):119-129.

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