Late Quaternary upper-water column structure in upwelling areas of the South China Sea  

作　　者：Huang Baoqi Jian Zhimin Cheng Xinrong Wang Pinxian 

机构地区：[1]Tongji Univ, Lab Marine Geol MOE, Shanghai 200092, Peoples R China

出　　处：《Chinese Science Bulletin》2001年第20期1741-1745,共5页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 49732060, 49776290 and 49776289).

摘　　要：Based on a quantitative analysis of planktonic foraminifera in two gravity cores (17928 and 17954), the history of the upper-water structure of the eastern and western slopes of the South China Sea (SCS) over the last 220 Ka was reconstructed using the transfer function technique. Our results show that lower sea surface temperature (SST) and shallower depth of thermocline (DOT) exist at Core 17928, off Luzon, in the glacial periods; on the contrary, the same situation turned up in the interglacial at Core 17954, off Vietnam. These changes of the upper-water column structure in the two areas are induced by coastal up-welling, which in turn is driven by monsoons, namely, winter monsoon leads to upwelling at the eastern slope, and summer monsoon gives birth to upwelling on the western slope. Moreover, the intensity of upwellings is also closely related to the evolution of the East Asian monsoon. Therefore, we assume that the changes of the upwelling in the two sites indicate strengthenning of winter andBased on a quantitative analysis of planktonic foraminifera in two gravity cores (17928 and 17954), the history of the upper-water structure of the eastern and west ern slopes of the South China Sea (SCS) over the last 220 Ka was reconstructed using the transfer function technique. Our results show that lower sea surface temperature (SST) and shallower depth of thermocline (DOT) exist at Core 17928, off Luzon, in the glacial periods; on the contrary, the same situation turned up in the interglacial at Core 17954, off Vietnam. These changes of the upper-water column structure in the two areas are induced by coastal upwelling, which in turn is driven by monsoons, namely, winter monsoon leads to upwelling at the eastern slope, and summer monsoon gives birth to upwelling on the western slope. Moreover, the intensity of upwellings is also closely related to the evolution of the East Asian monsoon. Therefore, we assume that the changes of the upwelling in the two sites indicate strengthenning of winter and summer monsoon during the glacial and inter glacial periods, respectively.

关 键 词：South China Sea Late QUATERNARY coastal UPWELLING upper-water column STRUCTURE SST DOT. 

分 类 号：P731[天文地球—海洋科学]