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Pleistocene precession forcing of the upper ocean structure variations of the southern South China Sea

Progress in Natural Science:Materials International 2004年第11期 68-73页

作者： TIAN Jun*, WANG Pinxian and CHENG Xinrong(Laboratory of Marine Geology, Tongji University, Shanghai 200092, China) LaboratoryofMarineGeology TongjiUniversityShanghai200092China

The precession plays a dominant role in driving the tropical monsoon variations. Our high resolution, millennial scale marine isotope records from ODP Site 1143 in the southern South China Sea (SCS) present the detailed history of the upper ocean structure variations over the past 1.56 Ma on glacial/interglacial timescale. The cross spectral analyses between the Earth’s orbital variations and the isotopic differences reveal a high coherency between the East-Asian-monsoon-related thermocline and nutricline variations of the SCS and the precession. The variations of monsoon-related isotopic difference between species also demonstrate periodicities of 11-, 12- and 14- thousand years near semi-precession which originates in the tropics, highlighting the importance of the precession in driving the east Asian monsoon changes.

关键词： South China Sea upper ocean structure precession forcing.

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Exploring variations in upper ocean structure for the last 2 Ma of the Nansha area by means of calcareous nannofossils

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Science China Earth Sciences 2001年第10期44卷 905-911页

作者：刘传联成鑫荣 Key Laboratory of Marine Geology Ministry of Education Tongji University Shanghai 200092 China

A great number of calcareous nannofossils have been found in the deep-sea sediments of 2.32 Ma at ODP Site 1143 located in the Nansha area, the southern South China Sea. The number of coccoliths varies from about 0.5×106 up to almost 53×106 coccoliths/g sediment, with an average of 16×106 coccoliths/g sediment. The accumulation rate of total coccoliths varies from 1×106 to 278×106 coccoliths/cm2 ka. The nannofossil assemblages are usually dominated by a lower-photic species-Florisphaera profunda, of which the average percentage is about 70% in all samples. The absolute abundance and the accumulation rate of nannofossils as well as the percentage ofF. profunda display significant oscillations on two different time scales. One is the fluctuation coincident with the glacial-interglacial cycle, and the other is the long-term changes on a time scale longer than 100 ka. Six evolutionary stages of calcareous nannofossils could be divided for the last 2.32 Ma, from which we can reconstruct the changes in the depth of nutricline of the Nansha area. In this paper, the possible mechanism resulting in these variations is also discussed.

关键词： calcareous nannofossil nutricline upper ocean structure Nansha area

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