REN Xiao-hui, CHEN Shi-tao, MING Yan-fang, WANG Yong-jin. EAST ASIAN MONSOON CLIMATE DURING THE LATE PENULTIMATE GLACIATION BASED ON STALAGMITE RECORDS[J]. Marine Geology & Quaternary Geology, 2007, 27(1): 47-52.
Citation: REN Xiao-hui, CHEN Shi-tao, MING Yan-fang, WANG Yong-jin. EAST ASIAN MONSOON CLIMATE DURING THE LATE PENULTIMATE GLACIATION BASED ON STALAGMITE RECORDS[J]. Marine Geology & Quaternary Geology, 2007, 27(1): 47-52.

EAST ASIAN MONSOON CLIMATE DURING THE LATE PENULTIMATE GLACIATION BASED ON STALAGMITE RECORDS

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  • Received Date: September 10, 2006
  • Revised Date: September 28, 2006
  • Two stalagmites are from Hulu cave, which is 1 600 m above sea level (ASL) in Nanjing. 11 sub-samples are dated by Finnigan MAT 262-RPQ at the Isotope Laboratory of Geology and Geophysics Department, Minnesota University, USA, and all 230Th ages are in stratigraphic order. The results provided a high-resolution paleoclimate record for East Asian monsoon area during a time interval from 155 to 128 kaBP of the penultimate glaciation.
    In order to check reliability of the stalagmite δ18O record, we compared δ18O records of these two stalagmites, for both grew contemporaneously during a time interval from 154.5 to 133 kaBP. The general replication of δ18O values of contemporaneous growth for 21.5 ka suggests fidelity of δ18O values as a proxy of paleoclimates.
    There were eight remarkable apexes in our stalagmite δ18O record, which show a mean shift of 1.5‰ in δ18O, lasting about 2ka, and a mean frequency of 2 ka. It bears a striking resemblance to D/O events during last glacial period in terms of structure and transition well expressed in the Hulu δ18O records. It is therefore likely that the dramatic climate fluctuation during the last glaciation may have occurred pervasively in the early glaciation time in Asian monsoon climates. Climate instability of glacial period may be also related to changes in the ice-sheets and tropical oceanic/atmospheric circulation.
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