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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24915

Title: The last 100,000 years paleoceanographic records of core MD012404 from the Okinawa Trough
Authors: Chang Y.-P.;H.-H. Weng;M.-T. Chen
Contributors: NTOU:Institute of Applied Geosciences
Keywords: East China Sea;Okinawa Trough;Kuroshio;East Asian Monsoon
Date: 2009
Issue Date: 2011-10-20T08:18:13Z
Publisher: Bulletin of Central Geological Survey
Abstract: Several high-resolution proxy indexes are established for indicating the paleoclimatic and paleoenvironmental variations of the East China Sea (ECS) from sediment samples of core MD012404 drilled in the Okinawa Trough (OT). Records of microfossil assemblages from foraminifera and diatoms inferred that influences of the Kuroshio in the OT might start at approximately 50-60 thousand years ago. Accompanied with a tectonic event of the Yonaguni Depression formed in this period, a passage might have been opened and facilitated Kuroshio drainage to enter the OT. In the period of the last glacial maximum, a lowering of the global sea level and/or global cooling would reduce the flow volume or restrict the Kuroshio’s drainage into the OT. The Kusoshio was intruded into the OT at least at ~16 thousand years ago which was encouraged by a gradual rising of the global sea level. Total organic components (TOC) of sediments from the OT might indicate the surface productivity of the ECS. Co-varied patterns of the TOC data and precipitation records on land revealed that the increased production of the ECS might indicate an enhanced East Asian summer monsoon. Warm and humid climatic conditions on land would increase the fresh water output to the ECS and then encourage the export and/or upwelling of nutrients to rise to the surface production. Results of this research point out that environmental changes in the ECS are effected by global changes, and the OT is a good study region to monitor the variations in the earth’s climate system.
Relation: 22, pp.125-168
URI: http://ntour.ntou.edu.tw/handle/987654321/24915
Appears in Collections:[應用地球科學研究所] 期刊論文

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