Late quaternary upper-water column structure in upwelling areas of the South China Sea |
| |
Authors: | Huang Baoqi Jian Zhimin Cheng Xinrong Wang Pinxian |
| |
Institution: | (1) Laboratory of Marine Geology of MOE, Tongji University, 200092 Shanghai, China |
| |
Abstract: | 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 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. |
| |
Keywords: | South China Sea Late Quaternary coastal upwelling upper-water column structure SST DOT |
本文献已被 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|