Eolian Dust Deposition and the Monsoon Changes during the Last Glacial Age in Japan.

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  • 日本における最終氷期の風成塵堆積とモンスーン変動
  • ニホン ニ オケル サイシュウ ヒョウキ ノ フウセイジン タイセキ ト モン

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Abstract

Eolian dust deposited during the last glacial age is distributed widely in east Asia. Eolian dust within the peat core of Nakaikemi in Tsuruga, paleosols on the Shirasu ignimbrite plateau in Kagoshima, and eolianite in Kikai Island were deposited in several periods dated as 12kyr, 14kyr, 17-18kyr, 21kyr, 27kyr, 31kyr, 35kyr, 38kyr, and 42kyr BP. ESR signal intensity of fine quartz (finer than 20μm) shows that eolian dust dated from 17kyr to 38kyr in Nakaikemi peat core was transported from north Asian Precambrian rock areas such as Siberia and Mongolia by the NW winter monsoon. On the other hand, eolian dust dated at 12kyr and 42kyr in Nakaikemi peat core and eolian dusts of Kagoshima and Kikai Island were transported from the central Asia by the summer subtropical jet stream.<br>Spikes in the dust deposition series match major changes in Neogloboquadrina pachyderma (s.) percentage in North Atlantic core V23-81 and loess-paleosol sequences of Chinese loess in Lanzhou and Luochuan. Ages of the dust depositional spike also match those of Dansgaard-Oeschger cold events and Heinrich events. This suggests that abrupt changes in dust deposition synchronized with global climatic changes such as Dansgaard-Oeschge Cycle.<br>The strength of the Asian winter monsoon may have accelerated the transport and deposition of eolian dust. Since Overpeck et al. (1996) pointed to the contribution of eolian dust as a potential source of episodic warming during the last glacial age, dust loading on snow fields of the Tibetan Plateau and associated snow darkening may have strengthened the summer monsoon. High eolian dust loading may have caused significant, episodic warming in east Asia. Dust-induced changes in the monsoon may have a role in triggering climate changes.

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