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

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.