A lacustrine record from Lop Nur,Xinjiang, China: Implications for paleoclimate change during Late Pleistocene |
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| Authors: | Luo Chao Peng Zicheng Yang Dong Liu Weiguo Zhang Zhaofeng He Jianfeng Chou Chenlin |
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| Institution: | 1. School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710054, China;3. Department of Geology, University of Illinois-Urbana Champaign, Urbana, IL 61801, USA;4. Illinois State Geological Survey (Emeritus), 615 East Peabody Drive, Champaign, IL 61820, USA;1. College of Environment and Resources, Inner Mongolia University, University West Road 235, Huhhot 010025, China;2. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;3. MOE Key Laboratory of Oasis Ecology, Xingjiang University, Urumqi 830046, China;4. College of Earth and Environment Science, Lanzhou University, Lanzhou 730000, China;1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS), 210008 Nanjing, China;2. Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydrology, 30655 Hannover, Germany;3. Key Laboratory of Western China''s Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, 730000 Lanzhou, China;4. Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, 730000 Lanzhou, China;1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;2. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;3. MOE Key Laboratory of Western China''s Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;4. GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker Weg 20, 24105 Kiel, Germany;5. Institut für Geowissenschaften, Universität Kiel, Ludewig-Meyn-Str. 10, D-24118 Kiel, Germany;6. Universität Kiel, 24118 Kiel, Germany;1. Key Laboratory of Western China''s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory of Alpine Ecology (LAE), CAS Center for Excellence in Tibetan Plateau Earth Sciences, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. Department of Earth Sciences, Uppsala University, Uppsala, SE-752 36, Sweden;4. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;5. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;6. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;7. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China;8. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;1. MOE Key Laboratory of Western China’s Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;1. Geological Institute, ETH Zurich, CH-8092, Zurich, Switzerland;2. University of Bayreuth, D-95440, Bayreuth, Germany;3. Institute for Soil Science, Tajik Academy of Agricultural Science, Dushanbe, Tajikistan |
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| Abstract: | Climate variability during the Late Pleistocene is studied from the proxies in core CK-2 drilled from the Luobei Depression (91°03′E, 40°47′N), Lop Nur in the eastern Tarim Basin, Xinjiang, China. Geophysical and geochemical properties, including magnetic susceptibility, granularity, chroma, carbonate content, loss on ignition and trace elements, have been determined to reconstruct the environmental evolution of the area during 32–9 ka BP. The chronology is established by uranium–thorium disequilibrium dating techniques.Our data suggest four paleoclimate stages, indicating glacial variations between cold–humid and warm–arid environments. A period of extreme humidity occurred during 31,900–19,200 yr BP is attributed the last glacial maximum (LGM). The period was followed by a warm–arid episode during 19,200–13,500 yr BP. Then a cold–humid interval during 13,500–12,700 yr BP may correspond to another cooling phases at high latitudes of the Northern Hemisphere. The last stage from 12,700 to 9000 yr BP has a trend that the climate turned warm and arid. The Lop Nur region is characterized by particularly humid stadials and arid interstadials. The climate variability in Lop Nur was constrained by global climate change because it is correlated with Dansgaard–Oeschger and Heinrich events, which were observed at the northern high latitudes. The synchroneity of the palaeoclimatic events suggested that cold air activity at the northern high latitudes was the most important factor that influenced the climate evolution in the Lop Nur region. A probable mechanism that involves the migration of westerly winds is proposed to interpret this synchroneity. |
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