Environmental change of palaeo-oceanography recorded in the sediment stratum in the noruhern part of South China Sea since the post glacial period

ZHANG Hai-sheng; ZHOU Huai-yang; LU Bing; CHEN Rong-hua; ZHANG Fu-yuan

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ZHANG Hai-sheng, ZHOU Huai-yang, LU Bing, CHEN Rong-hua, ZHANG Fu-yuan. Environmental change of palaeo-oceanography recorded in the sediment stratum in the noruhern part of South China Sea since the post glacial period[J]. Haiyang Xuebao, 2005, 27(3): 52-58.

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Environmental change of palaeo-oceanography recorded in the sediment stratum in the noruhern part of South China Sea since the post glacial period

1.
Key Laboratory of Submarine Geoscience of State Oceanic Adminstration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 2003-08-10
Rev Recd Date: 2004-02-16

Abstract

Abstract

Comprehensive study is carried out for 69 sediment samples by using the climatic index,U₃₇^k-SST,δ¹⁸O,δ¹³C,species composition of fossil micro-organisms as well as sediment type.The result shows that U₃₇^k-SST is 23.3~26.9℃ during the post glacial period and 22.2~23.8℃ during the last glacial period.Conversion function of planktonic foraminifer shows that seasonal temperature difference is 4.5~7.0℃ in the post glacial period and 7.0~9.0℃ in the last glacial period.This reflects the change of sea surface temperature as function of palaeo-climate change.The increase of Neogloboguadrina pachyderma density,a cold water dominant species coincides with that of Neogloboquadrina dutertrei whereas the abundance of tropical dominant species such as Pulleniatina obliqueloculata and Glohigerinoi desacculifer decreases during the last glacial period; the opposite trend is noticed during the post glacial period.The direct evidence of temperature alternation is provided by the assemblages and density variation of planktonic foraminifer,calcium micro-fossil in the palaeo-ocean.The resear chalso suggests that the northern part of South China Sea is mainly influenced by fluvial transport during the post glacial period and by wind during the last glacial period,reflecting the intensification of wind during winter season.
- South China Sea,
- U₃₇^k-SST,
- palaeo-oceano graphy,

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References(23)

References

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