碩士 / 國立中山大學 / 海洋科學系研究所 / 103 / The Okinawa Trough (OT), a back-arc basin locates between the Japan Sea and the East China Sea, is an ideal place for paleoclimatic and paleoceanographic studies not only because of its high sedimentation rate (~5-50 cm/ka) but also its distinctively hydrological characteristics influenced by the Kuroshio and East Asian monsoon. The Kuroshio transports large amount of heat from the tropics to middle latitudes, which has strong influences on global and regional climate systems. Therefore, studies of long-term variations of the Kuroshio flow pattern are important and implicative for past global changes.
Many published studies had discussed the issue of shifted Kuroshio mainstream during the Last Glacial Maximum period by using different proxies. Some of them suggested that the mainstream of Kuroshio had shifted out of the Okinawa Trough, but some were disagreed. Therefore, in this study, we used multi-species foraminiferal stable isotope records for reconstructing long-term upper-water thermal-structure by using 4 cores retrieved from the central Okinawa Trough. The results show that the Kuroshio surface warm water is re-enters into the Okinawa Trough since 15~16ka, and the Kuroshio tropical water, represents to the main watermass originating from the equatorial Pacific, flows into the Okinawa Trough during the interval of 13~14ka. Finally, the enhanced Kuroshio is observed during the early Holocene, at ~9 ka, then reaches the modern mode since then on.
| Identifer | oai:union.ndltd.org:TW/103NSYS5276002 |
| Date | January 2014 |
| Creators | Ming-Zhang Wang, 王銘章 |
| Contributors | Yuan-pin Chang, 張詠斌 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 95 |
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