Late quaternary high resolution monsoon records in planktonic stable isotopes from Northern South China Sea

被引：22
|
作者：
Ge H.-M. [1 ]
Li Q.-Y. [1 ,2 ]
Cheng X.-R. [1 ]
Zheng H.-B. [1 ]
He J. [1 ]
机构：
[1] State Key Laboratory of Marine Geology, Tongji University
[2] School of Earth and Environment Science, University of Adelaide
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2010年 / 35卷 / 04期
关键词：
East Asian monsoon; MD05-2904; Millennial scale climate change; Northern South China Sea; Oxygen isotope; Stratigraphy;
D O I：
10.3799/dqkx.2010.067
中图分类号：
学科分类号：
摘要：
Oxygen and carbon stable isotope records (with an average time resolution of 228 a) were obtained from Core MD05-2904 (19°27.32′, 116°15.15′, water depth 2066 m), using the mixed-layer dwelling planktonic foraminifer Globigerinoides ruber (white). The 45 m core spans from end of MIS 8 to the Holocene, representing the sediment record of the last 257 a. Strong precession periods (23.4 ka and 19.8 ka) were found from spectral analysis of both δ18O and δ13C records, following with semi-precession cycles (11.7 ka and 9.9 ka). The high resolution δ18O record of MD05-2904 reveals nearly all the Dansgaard/Oeschger and Heinrich events during MIS 2-4, as defined in the Greenland ice core record. A better correlation between MD05-2904 planktonic δ18O, the Hulu stalagmite δ18O record and previously published planktonic δ18O records from the SCS suggests that the planktonic δ18O record is influenced by monsoon-dominated regional factors, such as rainfall and river discharge related salinity changes. Lighter δ18O values in early MIS 3, early MIS 6 and MIS 7.4, and heavier values in MIS 5.5 are due to changes in precipitation and evaporation affected by monsoon. Sedimentation rates increased to 65-70 cm/ka in LGM, indicating more sediments when the site location was closer to the river mouth during glacial at lower sea level.
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页码：515 / 525
页数：10
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