渤海生物-物理相互作用的过程研究

To examine the physical processes impacts on the biological processes, we follow the idea of GLOBEC focusing on three steps: field survey, process analysis and modeling study. In this research, we provide a simple coupled physical and biological model and apply it in the Bohai Sea. The pcirculation model use the Blumberg & Mellor 3D nonlinear numerical coastal circulation model incorporating with Mellor & Yamada level 2.5 turbulent closure model. The circulation of Bohai Sea in spring is examined to provide a reliable physical environment for biological model. The model results indicate that the tidal residual current, density residual current has contribution to the springtime flow in the Bohai Sea while the wind stress is an dominant process in driving the flow. And also the model results suggest the importance of the wind variation to the whole circulation, especially for numerical study. A 3D coupled physical and biological model was used to examine the marine ecosystem of the Bohai Sea. The biological model described a simple, nitrate and phosphate based, lower trophic food web system. The model results indicated that the eddies induced by the baroclinic effect had the contribution to the patch distribution of the phytoplankton. A phytoplankton bloom may occur at the mouth of the river due to the high nutrient concentration because of the fresh water discharge. The wind variation has significant impact on the phytoplankton distribution at Laizhou Bay. Vertically, tidal mixing had a direct impact on the distributions of nutrients and phytoplankton. Nutrients and phytoplankton were well mixed vertically by tidal mixing.

探讨控制渤海生态系统平衡与演变的物理与生物的动力学耦合过程、定量地分析该海域中潮汐、风和表面热通量以及河口淡水输入、锋面的形成、演变和不稳定、潮流间非线性相互作用、底边界层动力结构及潮汐混合非对称性、风与潮流相互作用和渤黄海水交换对渤海生态系的影响。此研究对认识渤海生态系统的变化规律和海洋生物资源的持续性利用意义重大。