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EVIDENCE FOR ABRUPT CHANGES OF THE ASIAN MONSOON DURING THE HOLOCENE:FROM THE PEAT RECORDS OF TIBETAN PLATEAU

XIAN Feng~(1,2),ZHOU Wei-jian~(1),YU Xue-feng~(1,2),LU Xue-feng~(1),A J T Jull~(3),Lars G Franzén~(4)(1 Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China;2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China;3 NSF-AMS Facility,University of Arizona,Arizona AZ85721,USA;4 Department of Earth Sciences,Gteborg University,P.O.Box 460 SE-405 30 Gteborg,Sweden)  
Based on the proxies of peat such as TOC,grey scale and ash content,we reconstruct the evolution history of the Asian monsoon during the Holocene.Nine cold and dry events which can be correlated to both ice rafting events recorded in high latitude North Atlantic Ocean sediment cores and cooling events in the low latitude SST are recognized.Spectral analysis of the TOC data indicates that there exists series of periodicities of 1.428 ka,0.512 ka,0.255 ka and 0.217 ka.This further confirms the existence of centennial-millennial scale climatic rhythm in mid-latitude areas,reflecting the global significance of the rapid changes of climate during the Holocene.
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