Estimating the Budgets of Nutrients for Phytoplankton Bloom inthe Central Yellow Sea Using a Modified LowerTropic Ecosystem Model  

出　　处：《Journal of Ocean University of China》2014年第1期1-12,共12页中国海洋大学学报（英文版）

摘　　要：A modified lower trophic ecosystem model （NEMURO） is coupled with a three-dimensional hydrodynamic model for anapplication in the central Yellow Sea. The model is used to simulate the horizontal distributions and annual cycles of chlorophyll-aand 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. Dur-ing 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 contributionsFor phosphate and silicate, the dominant input is the transport across the thermocline, accounting for 62% and 68% of the totalsources, respectively. The N/P ratio averaged annually and over the whole southern Yellow Sea is up to 51.8, indicating the potentialof P limitation in this region. The important influence of large scale sea water circulation is revealed by both the estimated fluxes andthe 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 isestimated to be 4.6~ 101~, 2.3x 101~, 2.0x 109 and 1.2x 101~ mol, respectively.

关 键 词：budgets of NUTRIENTS spring BLOOM CENTRAL YELLOW Sea NEMURO 

分 类 号：X173[环境科学与工程—环境科学] X55