Climatic instability recorded by the mollusk assemblages from the late glacial loess deposits in China |
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Authors: | Naiqin Wu D D Rousseau Dongsheng Liu |
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Institution: | (1) Institue of Geology, Chinese Academy of Sciences, 100029 Beijing, China;(2) Laboratoire de Palynologie, Universite Montpellier II, URA 327, France |
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Abstract: | The loess-paleosol sequence in China records abundant and valuable information on the global and regional climate changes.
Biological record from the loess sequence is the most direct evidence on variation in pattern of paleo-atmospheric circulation
and changes in winter and summer monsoon. A new record of climatic instability, which occurred in the Loess Plateau during
the late glacial period, is presented. Through the study of terrestrial mollusks from three loess sequences, the authors intend
to characterize the biological response process to rapid climate change and to learn the mechanisms driving the instable climate
changes and the possible linkage in different regions. The result shows the striking consistent variability in the ratio records
of three mollusk sequences of the late glacial, indicating apparent rapid climate fluctuations. Correlation of our three mollusk
records with the oxygen isotopic records from Greenland ice cores and foraminifera1 records from the Northeast Pacific Ocean
reveals similar instability climate during the late glacial period, which provides us a new thought probing the climate instability
observed in the North Atlantic, the North Pacific and the Loess Plateau. The low-level atmospheric circulation in the Northern
Hemisphere may be one possible way to link the unstable climate patterns observed in the above three regions. |
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Keywords: | mollusk assemblages loess deposits late glacial period |
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