碩士 / 國立臺灣大學 / 海洋研究所 / 89 / Because of the ability of the East China Sea serving as a “continental shelf pump” to absorb atmosphere CO2, a better understanding of the biogeochemical cycles in the East China Sea is critical for an accurate assessment of its pump capacity. There have been several studies on the box model of biogeochemical fluxes on the East China Sea continental shelf. In these studies, the authors either neglected the transport through the Taiwan Strait, or assumed rather small values for the transport. In addition, they based their calculations on rough estimates of the mean salinities for different water masses. Because the chemical hydrography measurements in the study were scarce, we also made investigations in the study area, and included the findings in the new calculations. For the box model, we have made careful estimates of the mean salinities of various the continental shelf water masses.
By water mass analysis we conclude that, in winter, the sea water in the northern part of the Taiwan Strait consists of waters from the Penghu Channel Current, the China Coastal Water and the Kuroshio upwelling water from the shelf break off northeastern Taiwan. The Punghu Channel Current has an estimated transport of 0.5Sv(1Sv=106m3/s) with average salinity and nitrate concentration of 34.5psu and 1.5μM, respectively. In summer, the Taiwan Strait Current has an estimated transport of 2.3Sv with average salinity and nitrate concentration of 33.78psu and 1.0μM, respectively. Assuming that the northeast monsoon affects the current for eight months, and the southwest monsoon affects the current for four months, we calculate the annual transport from the Taiwan Strait to the East China Sea to be 1.08Sv with annual mean salinity of 34.0psu and annual mean nitrate concentration of 1.13μM.
When including the contribution of the Taiwan Strait Current to the box model, we must invoke a two-box model to balance the salt budget. The box model predicts that the mean inflow from the Kuroshio Water to the continental shelf is 1.18-1.29Sv, the mean outflow from the shelf is 2.34-2.45Sv, the average potential new production over the entire shelf is 84-92mgC/m2/d, and the mean residence time of the entire shelf water is 0.62-0.65year.
| Identifer | oai:union.ndltd.org:TW/089NTU00279038 |
| Date | January 2001 |
| Creators | Kuang-Ching Chen, 陳冠青 |
| Contributors | Kon-Kee Liu, 劉康克 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 69 |
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