| Estimating the Budgets of Nutrients for Phytoplankton Bloom in the Central YellowSea Using a Modified Lower Tropic Ecosystem Model |
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| 作者姓名： | YUAN Chengyi WANG Yuheng and WEI Hao |
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Estimating the budgets of nutrients for phytoplankton bloom in the central Yellow Sea using a modified lower tropic ecosystem model |
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| YUAN Chengyi,WANG Yuheng,and WEI Hao.Estimating the Budgets of Nutrients for Phytoplankton Bloom in the Central YellowSea Using a Modified Lower Tropic Ecosystem Model[J].Journal of Ocean University of China,2014,13(1):1-12. |
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| Authors: | Chengyi Yuan Yuheng Wang Hao Wei |
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| Institution: | 1. College of Physical and Environmental Oceanography, Ocean University of China, Qingdao, 266100, P. R. China
2. College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin, 300457, P. R. China
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| Abstract: | A modified lower trophic ecosystem model (NEMURO) is coupled with a three-dimensional hydrodynamic model for an application in the central Yellow Sea. The model is used to simulate the horizontal distributions and annual cycles of chlorophyll-a and nutrients with results consistent with historical observations. Generally, during the winter background and spring bloom periods, the exchange with neighboring waters constitutes the primary sources of nutrients. Howerver, during the winter background period, the input of silicate from the layer deeper than 50 m is the most important source that contributes up to 60% to the total sources. During the spring bloom period, the transport across the thermocline makes significant contribution to the input of phosphate and silicate. During the post spring bloom period, the relative contribution of relevant processes varies for different nutrients. For ammonium, atmospheric deposition, excretion of zooplankton and decomposition of particulate and dissolved nitrogen make similar contributions. For phosphate and silicate, the dominant input is the transport across the thermocline, accounting for 62% and 68% of the total sources, respectively. The N/P ratio averaged annually and over the whole southern Yellow Sea is up to 51.8, indicating the potential of P limitation in this region. The important influence of large scale sea water circulation is revealed by both the estimated fluxes and the corresponding N/P ratio of nutrients across a section linking the northeastern bank of the Changjiang River and Cheju Island. During the winter background period, the input of nitrate, ammonium, phosphate and silicate by the Yellow Sea Warm Current is estimated to be 4.6×1010, 2.3×1010, 2.0×109 and 1.2×1010 mol, respectively. |
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