Holocene climate reconstructions of Ulungur Lake (Xinjiang,China) inferred from ostracod species assemblages and stable isotopes |
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Authors: | Qingfeng JIANG Ji SHEN Xingqi LIU Enlou ZHANG |
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Institution: | (1) School of Geographical Science, Nantong University, Nantong, 226007, China;(2) Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China |
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Abstract: | In this paper, the data on the paleoclimatic and paleoenvironmental changes during the Holocene are presented and a discussion
is made on a 225-cm-long sediment core from Ulungur Lake, located in Northwest China. The chronology is constructed from six
AMS radiocarbon dates on the bulk organic matter. On the basis of the analysis of ostracod assemblages and the shell stable
isotopes, the core is divided into three paleoclimatic and paleoenvironmental evolution stages: 9 985–5 250 cal.aB.P. stage
is the wettest phase of the core section. The climate changed from moderate-dry to cool-wet, and then to warm-wet in turn,
and the lake level rose accordingly, showing the characteristic of a high lake level. 5 250–1 255 cal.aB.P. stage was the
driest phase of the core sediment. The climate turned from the early warm-dry to the late warm-wet and the lake level fell
and rose again. Finally, the 1 255 cal.aB.P. stage was the medium stage of the section. The temperature was low and then increased
after the 1920s and the climate was dry. The whole climatic and environmental evolution records of Lake Ulungur were not only
in agreement with the sporopollen record of the same core but also in agreement with the record of environmental changes of
adjacent areas. It responded to regional environmental changes and global abrupt climate events, following the westerly climate
change mode on 100-year-scale, primarily with cold-wet and warmdry characteristics.
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Translated from Quaternary Sciences, 2007, 27(3):382–391 译自:第四纪研究] |
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Keywords: | Ulungur Lake ostracod assemblages oxygen and carbon stable isotopes paleoclimatic and paleoenvironmental change Holocene |
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