Title: CHANGE OF THE EAST-ASIAN MONSOON CLIMATE DURING THE LAST GLACIATION :δ~(18)O RECORDS OF STALAGMITES IN QIXING CAVE, DUYUN CITY, GUIZHOU PROVINCE
Abstract: Through 31 TIMS- U series dating and 543 samples of carbon oxygen stable isotope analysis from 4 stalagmites in Qixing cave, 11000 to 85000a climatic changes isotope records are obtained continuously. The study indicates that stalagmite's oxygen isotope records are same with the sea isotope records, which also may be divided correspondingly to MIS2, MIS3, MIS4 and MIS5a climates stages. And the demarcation lines are as follows: 11.3ka B.P. between MIS1 and MIS2, 28.7 ka B.P. between MIS2 and MIS3, 59.6 ka B.P. between MIS3 and MIS4, and 78.5 ka B.P. between MIS4 and MIS5a. It is showed by the study on stalagmite records that the last glacial epoch corresponds to YD and the Heinrich events recorded in North Atlantic sediment, and also corresponds to ice core from Greenland. Several pieces of stalagmite are of extremely consistent and exact locating and timing. The age of the YD event occured 12.76~11.52 kaB.P., and H1~H6 of the Heinrich event is respectively 15~17 kaB.P., 24.6kaB.P., 30.5kaB.P., 39.3kaB.P., 46.8~47.8kaB.P., 60.4kaB.P.. The stalagmite records expose out two cold events at 66.4kaB.P. and 73.8 kaB.P. during MIS4, those are very similar to the two clough in Greenland ice core record curve. A comparing study with GISP2 indicated that the climate transition of East Asian monsoon in hundred and thousand years scale is consistent to the North Atlantic and Greenland climate change. It is significant for the study on the dynamical mechanism of East Asia monsoon climate and on the corresponding relationship to global change.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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