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题名: High-resolution precipitation variations in the Northeast Tibetan Plateau over the last 800 years documented by sediment cores of Qinghai Lake
作者: Zhang, JW; Jin, M; Chen, FH(陈发虎); Battarbee, RW; Henderson, ACG
收录类别: SCIE ; CPCI-S
出版日期: 2003-07
会议名称: Symposium on Abrupt Environmental Changes in Arid Asia History and Mechanisms (RACHAD 2001)
会议日期: OCT, 2001
会议地点: LANZHOU, PEOPLES R CHINA
英文摘要: Short cores of about 80-cm retrieved from three main basins of the deepwater areas in Qinghai Lake, the largest inland enclosed lake in China, were studied. Stable isotopes of authigenic carbonates, grain-size, carbonate and organic matter content at 5-year resolution are used to reconstruct the climatic history over the last 800 years in the Northeastern Tibetan Plateau. Chronology was established according to (210)Pb dating and (137)Cs methods and the core correlation. It is found that cores from different deep basins of the lake can be well correlated. The sedimentary rate is highest in the western basin of the lake and lowest in the east. In the southern basin of the lake where the short core Qing-6 is located, the recent average sedimentation rate is 0.1004 cm/yr. Variations in effective precipitation recorded by the oxygen isotopes and grain size data during the last 800 years are consistent with the glacial accumulation record form the Dunde and Guliya ice cores. A dry climate lasted for 300 years from 1200 AD to 1500 AD, followed by a wet period from 1500 to 1560 AD. The two dry periods, 1560 to 1650 AD and 1780 to 1850 AD, were the results of southwest monsoon weakening. The effective precipitation generally increased since 1650 AD due to the strengthening of the Asian Southwest Monsoon, resulting in a wet period until the 1950s. Except the early stage, the Little Ice Age on the Plateau is characterized by increased effective moisture. Organic matter content, with nearly 200-year cycles, shows similar trend with the atmospheric delta carbon-14 before the 1850s, indicating that the bioproductivity responds to solar activity.
关键词: Qinghai Lake ; carbonate oxygen isotope ; grain size ; effective precipitation ; Tibetan Plateau
作者部门: Lanzhou Univ, Ctr Arid Environm & Paleoclimate Res, Natl Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China ; Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Desert & Desertificat Lab, Lanzhou 730000, Peoples R China ; UCL, Dept Geog, Environm Change Res Ctr, London WC1H 0AP, England
通讯作者: Chen, FH (reprint author), Lanzhou Univ, Ctr Arid Environm & Paleoclimate Res, Natl Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China.
学科分类: Science & Technology - Other Topics
会议主办者: LANZHOU UNIV
会议录: CHINESE SCIENCE BULLETIN
卷号: 48
期号: 14
页码: 1451-1456
出版者: SCIENCE CHINA PRESS
出版地: BEIJING
语种: 英语
DOI: 10.1360/02wd0271
ISSN号: 1001-6538
WOS记录号: WOS:000184463300010
IR记录号: WOS:000184463300010
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内容类型: 会议论文
URI标识: http://ir.lzu.edu.cn/handle/262010/184647
Appears in Collections:资源环境学院_会议论文

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Recommended Citation:
Zhang, JW,Jin, M,Chen, FH,et al. High-resolution precipitation variations in the Northeast Tibetan Plateau over the last 800 years documented by sediment cores of Qinghai Lake[C]. 见:Symposium on Abrupt Environmental Changes in Arid Asia History and Mechanisms (RACHAD 2001). LANZHOU, PEOPLES R CHINA. OCT, 2001.
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