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Holocene Abrupt Climate Shifts and Mid-Holocene Drought Intervals Recorded in barkol lake of Northern Xinjiang of China

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Chinese Geographical Science 2008年第1期18卷 54-61页

作者： XUE Jibin ZHONG Wei ZHAO Yinjuan PENG Xiaoying School of Geography Science South China Normal University Guangzhou 510631 China National Laboratory of Western China＇s Environmental Systems Lanzhou University Lanzhou 730000 China

Study results in this paper have indicated that the Holocene climate in Xinjiang, Northwestem China has been alternating between wet and dry conditions, and was punctuated with a series of abrupt climate shifts. A sediment core taken from barkol lake in the northern Xinjiang of Northwest China was analyzed at 1 cm interval for grain-size distribution. Abrupt climate shifts revealed by the grain-size proxy occurred at ca 1.4, 3.0, 4.3, 5.6, 8.0 cal kyr B.E, which were well correlated to both the abrupt shifts recorded in the North Atlantic Ocean （NAO） and the Holocene sea surface temperature （SST） cooling events in the Arabian Ocean. The correlation indicated that the climatic changes in the extreme arid Northwest China were associated with the NAO, probably via the North Atlantic Oscillation-affected westerly winds. The strength and position of westerly winds probably modulated the Siberian-Mongolian high- pressure system （winter monsoon）, and played an important role in climate change of Northwest China. Moreover, an evident drought interval during the middle Holocene was also revealed by grain-size proxy.

关键词： abrupt climate shifts grain size Holocene barkol lake Xinjiang

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Holocene climate variation denoted by barkol lake sediments in northeastern Xinjiang and its possible linkage to the high and low latitude climates

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Science China Earth Sciences 2011年第4期54卷 603-614页

作者： XUE JiBin & ZHONG Wei 1 School of Geography,South China Normal University,Guangzhou 510631,China 2 Key Laboratory of Oasis Ecology(Ministry of Education) ,Xinjiang University,Urumqi 830046,China 3 Key Laboratory of Western China’s Environmental Systems(Ministry of Education) ,Lanzhou University,Lanzhou 730000,China School of Geography South China Normal University Guangzhou China Key Laboratory of Oasis Ecology (Ministry of Education) Xinjiang University Urumqi China Key Laboratory of Western China’s Environmental Systems (Ministry of Education) Lanzhou University Lanzhou China

The climate over the closed inland barkol lake, which is located in northeastern Xinjiang Uygur Autonomous Region, is sig- nificantly influenced by westerly winds today. To improve our understanding of past climate processes in westerly wind influenced regions in northwestern China, a 250-cm sediment section was retrieved from this lake. After taking the carbon reservoir effect into consideration, the chronological sequence of this section was reconstructed based on seven conventional radiocarbon dates of bulk samples, and the bottom age of this section was determined to be about 9400 cal a BP. Multi-proxy datasets, including δ^18Ocar, δ^13Ccar of authigenic carbonate, and total organic carbon were examined using wavelet analysis and singular spectrum analysis methods. Results show that the Holocene in the barkol lake region can be divided into four stages：（1） a cold and dry early stage before -8000 cal a BP; （2） a moderately warm and wet middle stage between -8000 and 6000 cal a BP; （3） a warm and dry stage, along with a cooling-wetting tendency from 6000 to 2700 cal a BP; and （4） a fluctuating cooling and wet stage between 2700-800 cal a BP, and a drier stage since 800 cal a BP. The general trend of Holocene climatic changes revealed by barkol lake sediments was in agreement with that of adjacent regions. We infer that climatic changes during the Holocene in the barkol lake region were influenced not only by high latitudes, especially the North Atlantic region climate, but also tropical low-latitude processes, such as the El Nifio/La Nifia-Southern Oscillation. This study demonstrates that the enhanced activities of ENSO may have played an important role in climatic changes in northeastern Xinjiang during the Holo- cene. Our results also suggest that climatic patterns may be temporally different in the northern Xinjiang area in response to the changing predominant control of either the Westerly or the Asian summer monsoon, depending on the contrast of their relat

关键词： barkol lake Holocene climate change tropical processes northern high-latitude climate

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