National Taiwan Ocean University Institutional Repository:Item 987654321/25457
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题名: Cold deep water in the South China Sea
作者: Ya-Ting Chang;Wei-Lun Hsu;Jen-Hua Tai;Tswen Yung Tang;Ming-Huei Chang;Shenn-Yu Chao
贡献者: NTOU:Department of Marine Environmental Informatics
國立臺灣海洋大學:海洋環境資訊系
关键词: Deep water renewal;South China Sea
日期: 2010-04
上传时间: 2011-10-20T08:23:17Z
出版者: Journal of Oceanography
摘要: abstract:Two deep channels that cut through the Luzon Strait facilitate deep (>2000 m) water exchange between the western Pacific Ocean and the South China Sea. Our observations rule out the northern channel as a major exchange conduit. Rather, the southern channel funnels deep water from the western Pacific to the South China Sea at the rate of 1.06 ± 0.44 Sv (1 Sv = 106 m3s−1). The residence time estimated from the observed inflow from the southern channel, about 30 to 71 years, is comparable to previous estimates. The observation-based estimate of upwelling velocity at 2000 m depth is (1.10 ± 0.33) × 10−6 ms−1, which is of the same order as Ekman pumping plus upwelling induced by the geostrophic current. Historical hydrographic observations suggest that the deep inflow is primarily a mixture of the Circumpolar Deep Water and Pacific Subarctic Intermediate Water. The cold inflow through the southern channel offsets about 40% of the net surface heat gain over the South China Sea. Balancing vertical advection with vertical diffusion, the estimated mean vertical eddy diffusivity of heat is about 1.21 × 10−3 m2s−1. The cold water inflow from the southern channel maintains the shallow thermocline, which in turn could breed internal wave activities in the South China Sea.
關聯: 66(2), pp.183-190
URI: http://ntour.ntou.edu.tw/handle/987654321/25457
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