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Abrupt changes of radiolarian fauna at 600 and 120 ka B. P. in the southern South China Sea and their paleoceanographic implications
作者姓名:Wang Rujian  Andrea Abelmann
作者单位:Alfred Wegener Institute for Polar and Marine Research! 27515 Bremerhaven,Germany
基金项目:This project was supported by the National Natural Science Foundation of China under contract! Nos 49946011 and 49999560,by
摘    要:IWr~IOXThe Nansha Islands area of the mouth China Sea is located at the margin of the West Pacificwarm POOl. Its variations in physical and chemical properties, namely, the stability of the WestPacific warm afl, involve the global climatic changes, for instance, EI Nino events caused theglobal climatic anomaly in the recent years and evolution of East Asian mourn. Therefore thearea is of imPOrtance for the global climatic changes. Recently recovered deep-sea sediment coresfrom the are…

关 键 词:Radiolarian  fauna  abrupt  changes  600  and  120  ka  B.  P.  East  Asian  monsoon  South  China  Sea
收稿时间:4/1/2000 12:00:00 AM
修稿时间:6/5/2000 12:00:00 AM

Abrupt changes of radiolarian fauna at 600 and 120 ka B. P. in the southern South China Sea and their paleoceanographic implications
Wang Rujian,Andrea Abelmann.Abrupt changes of radiolarian fauna at 600 and 120 ka B. P. in the southern South China Sea and their paleoceanographic implications[J].Acta Oceanologica Sinica,2000,19(3):131-138.
Authors:Wang Rujian and Andrea Abelmann
Affiliation:1.Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China2.Alfred Wegener Institute for Polar and Marine Research, 27515 Bremerhaven, Germany
Abstract:Abrupt changes in radiolarian composition are discovered over the last 600 and 120 ka B. P. based on quantitative analyses of radiolarians in ~ 17957 - 2 of the southern South China Sea. The distinct changes at 600 ka B. P. could correspond to the onset of the 100 ka cycle during the glacial and interglacial periods. This abrupt change in the 100 ka cyclicity at 600 ka B. P. occurred also in the magnetic susceptibility signal that is obtained from and paleosol sequences of the China Loss Plateau. The larger amplitude and stronger cyclicity in the susceptibility signal after 600 ka B. P. reflect the prominent change in the intensity of the monsoon, induced by an enhancement of the momsoon circula- tion. Stronger seasonality during the glacial period in the South China Sea, resulted from strengthening of winter monsoon, might lead to the changes in the radiolarian composition at 600 and 120 ka B. P. It can be suggested that only species adapted to a broader temperature range might have been able to live in this environment. Therefore, the abrupt changes in radiolarian composition at 600 and 120 ka B. P. could be attributed to the stronger so differences between summer and winter that were caused by the striking change in the intensity of the monsoon circulation.
Keywords:Radiolarian fauna  abrupt changes  600 and 120 ka B  P    East Asian monsoon  South China Sea
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