Holocene environmental evolution recorded by core sediments of Judian Lake in the east of Lubei Plain,Shandong Province |
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| Authors: | Zou Chun-Hui Zhao Qiang Mao Long-Jiang |
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| Institution: | 1.Institute of the History of Science and Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China;2.School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China;3.College of Marine Science,Nanjing University of Information Science and Technology,Nanjing 210044,China |
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| Abstract: | Judian Lake in the east of Lubei Plain is located in the monsoon area of northern China,which is sensitive to global climate change and provides abundant lake sedimentary data for the study of the past climate and environment evolution in the land-sea interaction area. Based on the sporopollen identification,grain size analysis and AMS14C dating of core sediments from the drilling hole of the Judian Lake,the evolutional process of climate and environment since 8900 cal a BP in the northern Lubei Plain was discussed. The results show that: 8900-7625cal a BP,the temperature and precipitation increased and the climate changed from cold-dry to warm-wet;7625—6810 cal a BP,the overall climate was becoming cooler and drier;6810—4435cal a BP,the temperature rose and the precipitation increased,showing an overall warm and humid climate in the middle Holocene;4435—3150cal a BP,the climate was generally cold and humid with some low-amplitude fluctuations of cold and warm. During the middle Holocene,there were two obvious cold and dry events in 5450—5280cal a BP and 4160—4090cal a BP,which was consistent with the geological and climatic records in China and even in the world. It may be due to the southward movement of the equatorial convergence zone caused by the change of solar radiation,the change of ocean surface temperature and the feedback of surface vegetation. |
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| Keywords: | Judian Lake Holocene grain size sporopollen environmental evolution |
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