碩士 / 國立中山大學 / 海洋地質及化學研究所 / 85 / Down-core variation of the biogenic opal content in the marine sediments from the South China Sea(SCS) is the primary object for this study. Three deep-sea cores, 17928-3(18°16'N, 119°44'E, w.d. 2484m), 17950-2(16°05'N, 112°53'E, w.d. 1865m), and 17957-2(10°53'N, 115°18'E, w.d. 2195m), were collected by the R/V SOONNE from the northern and southern SCS and were analyzed. The variation of surface productivity is revealed by the biogenic parameter in conjunction with the contents of organic carbon, carbonate, and coarse fraction over the last 150,000 years. Because the three deep-sea cores spread over most the SCS, records of surface productivity are compared and discussed to explore the difference of local environment.
According to the mass accumulation rates(MAR) of biogenic opal, organic carbon, and carbonate, high surface productivity general existed in the northern SCS during the glacial time. On the contrary, in the southern part of the basin high surface productivity was shown during the interglacial time. The time-series of surface productivity is thus different between the north and south for the last 150,000 years. Because hydrography in the SCS is largely controlled by the East Asian Monsoon, variations of paleoproductivity can be linked to the paleomoonsoon. High surface productivity in the northern SCS is related with the increased winter monsoon during the glacial time, whereas the elevated productivity in the south is corresponding with the intensified summer monsoon during the interglacial time.
| Identifer | oai:union.ndltd.org:TW/085NSYS3271003 |
| Date | January 1997 |
| Creators | 丁信中 |
| Contributors | 林慧玲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 100 |
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