Paleointensity of the asian winter monsoon and the westerlies since the last glacial period, reconstructed by eolian dust flux in lacustrine sediments of lake biwa and lake suigetsu, central japan
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Lacustrine sediments of Japan contain a lot of eolian dusts transported from Chinese Loess Plateau by the Asian winter monsoon and the westerlies. Sequential changes of eolian dust concentrations in lacustrine sediments since the last glacial period would be useful as a proxy record for reconstructing paleointensity of the Asian winter monsoon and the westerlies. In this paper, it is clarified that the changes of eolian dust flux during the last 38,000 years in the lacustrine sediments of Lake Biwa and Lake Suigetsu, central part of Japan. Sedimentological observations and calculation of sedimentary flux in lacustrine sediment cores of both lakes show that most of illite and quartz minerals in lacustrine sediments originate in eolian dusts from the inland of China, and that the intensity of the Asian winter monsoon and the westerlies has strengthened when eolian quartz flux was higher and has weakened when flux was lower. These changes of the intensity of the Asian winter monsoon and the westerlies have been closely related to the global climatic changes. In the Lake Biwa sediments during the last 38,000 years, it can be recognized such global climate coolings as Heinrich events 1-4, Younger Dryas and 8.2 ka cooling event. In the Lake Suigetsu sediments. Younger Dryas and Older Dryas cooling periods can be recognized. Also, our investigations suggest that the changes of the intensity of the Asian monsoon and the westerlies might be one of the triggers of the global environmental changes.
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