Pleniglacial millennium-scale climate variations in northern China based on records from the Salawusu River Valley

查看全文 作　　者：FengNian [1]WANG;BaoSheng [1,2]LI;JiangLong [3]WANG;XiaoHao [1]WEN;DongFeng [1]NIU;ZhiWen [4]LI;YueJun [1]SI;YiHua [1]GUO;ShuHuan [5]DU

机构地区：[1]School of Geography,South China Normal University,Guangzhou 510631,China;[2]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China;[3]Chenghai Middle School,Shantou 510601,China;[4]College of Earth Science,East China Institute of Technology,Nanchang 330013,China;[5]Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China

出　　处：《Journal of Arid Land》索引2012年第4卷第3期,共10页

基　　金：funded by the National Basic Research Program of China (2010CB833405, 2004CB720206);the National Natural Science Foundation of China (40772118, 49971009);Foundation of the State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences (SKLLQG0309);the Research Grants Council Grant of the Hong Kong Special Administrative Region(HKU7243/04H);the Knowledge Innovation Project of Chinese Academy of Sciences (KZCX2-SW-118) 摘　　要：Situated in the Salawusu River Valley, southeast of China's Mu Us Desert, the MGS2 (Milanggouwan section) portion of the Milanggouwan stratigraphic section records 5.5 sedimentary cycles consisting of alternations between dune sand deposits and fluvial or lacustrine facies. We analyzed the grain-size and CaCO 3 distributions in MGS2, and found that Mz (mean particle diameter) and σ (standard deviation) displayed clear variations in peaks and valleys within different sedimentary facies. The CaCO 3 content averaged 0.4% in the dune sand deposits, 1.43% in the fluvial facies, and 8.82% in the lacustrine facies. Both the grain-size distribution and CaCO 3 contents, which equal the indicators for the alternation among the sedimentary facies, suggest the occurrence of 5.5 cycles. These results suggest that the observed cycles mainly resulted from fluctuations between a cold and dry winter monsoon climate and a warm and humid summer monsoon climate, and that the MGS2 portion experienced at least 5.5 fluctuations between these two extremes. This high-frequency climatic fluctuation indicates a strong influence of millennium-scale variations in the strength of the East Asian winter and summer monsoons in our study area during the Pleniglacial. 关键词：萨拉乌苏河流域中国北方千年尺度气候变化 CaCO3含量季风气候区东亚冬季风基础

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Pleniglacial millennium-scale climate variations in northern China based on records from the Salawusu River Valley

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