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《中国地理科学(英文版)》 2008-01
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Holocene Abrupt Climate Shifts and Mid-Holocene Drought Intervals Recorded in Barkol Lake of Northern Xinjiang of China

XUE Jibin1,ZHONG Wei1,2,ZHAO Yinjuan1,PENG Xiaoying1 (1.School of Geography Science,South China Normal University,Guangzhou 510631,China;2.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,Northwestern 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 1cm 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.P.,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.
【Fund】: Under the auspices of National Natural Science Foundation of China (No. 49761007);; Open Foundation of National Laboratory of Western China’s Environmental Systems Lanzhou University
【CateGory Index】: P532
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