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《Earth Science(Journal of China University of Geosciences)》 2008-06
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Molecular Organic Geochemical Record of Paleoenvironmental Changes of Core 17937 in Northern South China Sea Since 40 ka

LI Li,WANG Hui,WANG Pin-xian State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China  
Molecular organic geochemical analysis of Core 17937 in the northern South China Sea has provided useful information on the paleoenvironmental change in the 40 ka and revealed that the average surface temperature of Uk'37-SSTs in glacial and interglacial is 27 ℃ and 24 ℃ respectively,resulting in a difference of 4.5 ℃ between Holocene and LGM.The terrestrial input,mainly consisting of high molecular weight alkanes and marine primary productivity,constituting long chain alkenones,both exhibited a high value in glacial and low value in interglacial,which suggests the supply of organic matter from the land is enhanced and the productivity in the ocean during glacial is increased.Alkane ratio of C31/C27 indicated that the predominant plants in South China changed from grass during glacial to tree during interglacial.All the results show the instability of climate since the last glacial in the SCS,and the significant role played by marine and terrestrial ecosystems in climate changes,as well as the potential of molecular organic geochemistry in paleoenvironment and paleoclimate studies.
【Fund】: 国家自然科学基金项目(No.40403012);; 同济大学青年优秀人才培养行动基金(No.2006KJ055);; 国家重点基础研究发展计划(No.2007CB815904);; 国家自然科学基金委创新研究群体科学基金(No.40621063)
【CateGory Index】: P532
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