High resolution paleoclimatic environment records from a stalagmite of Dongge Cave since 15000a in Libo,Guizhou Province,China

The time sequence of high resolution paleoclimatic change since 1 5470a i s reconstructed by the dating ages of the high precision TIMS-U ser ies and the analysis of the carbon and oxygen isotopes from a stalagmite of Dong ge Cave in the area of Libo,Guizh ou Province.The results show that th e recor ds of the warm and cold events from the stalagmite since 15470a in t he are a of Libo reflected the paleoclimatic change which can be divided in to four sta ges:(1)the late stage of the late Pleistocen e Epoch,Heinrich event H1and Younger Drays event during15470a to 11350a indicated that the East Asi an winter monsoon was strong,the air temperature was low,the available rainfal l relatively reduced in summer season and represented the dry and cold climate e nvironment in this stage;(2)the early Holocene Epoch,the dry and hot stage from 11350a to 9190a reflec ted that the East Asian summer monsoon was strong,the air te mperature was high,the available ra infall relatively reduc ed in summer season and represented the dry and hot climate environment in this stage;(3)the middle Holocene Epoch,Climate optimum time from 9190a to 3320a refl ected that the East Asian summer monsoon was relatively strong,t he air temperature was high,the available rainfall relatively increased in su m mer season and presented the warm an d humid climate environment in this stage; (4)the late Holocene Epoch,falling tem perature time from 3320a to 13 0a shown that the East Asian summer mon soon became weak and winter monsoon b e came strong,the air temperature gradually reduced,the available ra infall was very rich in winter season,and the frequency of climate undula tion increased t oo,the interval time of t he recently cold phase and the warm or hot phase beca me shorter.The record s of the carbon and oxygen isotopes fro m the stalagmite reveal the last two c old or cool events during the late sta ge of the last glac ial period,in which their ages of the coldest deep valley are(15440±13 0)a(H1)and(11910±70)a(YD),respectively,at the same time the b orderline age of the termination I during the last glacial period is confirmed to be(11350±70)a through the precisely dating ages o f TIMS-U series from the stalagmites in Dongge Cave.And it is confirmed that the cold events th at are in correspondence w ith the Heinrich cold events H1and Younger Drays eve nt in the North Atla ntic Ocean exist in the East Asian mon soon climate region of South China during the last glacial period.The p aleo-monsoon circulating current changes in the area of Libo reflected t hat the East Asian summer monsoo n changed fr om weak to strong and then from strong to weak,the available rainf all was from minor to much more and then from m ore to little and from little to more a gain,and the air temperature was fro m the low(or cold)to high(or ho t)and from high to low again.The paleo-monsoon circulating current changes i n this area are clearly affected by the climate oscillation of the North Atl ant ic Ocean,and indicate that they h ave well teleconnection with the paleoclima t ic change occurred in the North pole region.