期刊
CONTINENTAL SHELF RESEARCH
卷 120, 期 -, 页码 59-67出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2016.03.018
关键词
Nutrients; Internal tide; Hungtsai trough; South China Sea; Nutrient flux
类别
资金
- Institute of Oceanography, National Taiwan University
- Ministry of Science and Technology, Taiwan
Temporal variations in hydrographic parameters and nutrients were observed in a 300 m deep submarine canyon (Hungtsai Trough) near the southern tip of Taiwan. A vigorous oscillation below the surface layer has been observed which relates closely to an internal tidal wave generated from the nearby Luzon Strait. The vertical movement can be measured by monitoring an 18 degrees C isothermal depth which shows an up-and-down oscillation between 90 and 240 m with an average displacement of 110 m within a tidal cycle, a scale significantly larger than has been reported elsewhere. The frequency of this oscillation coincides with the surface tide but in an almost opposite phase. All hydrographic and chemical parameters (oxygen, density, fluorescence, transmittance and nutrients including nitrate, phosphate and silicate) synchronize with the tidal movement, as judged by normalized plots against temperature. When the nutrient-rich deep water upwells and becomes an outcrop over the trough rim at 100 m deep, it is swept horizontally by the strong alongshore tidal current. Consequently, the trough acts as a source point to supply extra nutrients to the coastal ecosystem. (C) 2016 Elsevier Ltd. All rights reserved.
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