渤海示踪物输移扩散季节性变化的研究

Study on seasonal variation of the tracer diffusion in the Bohai Sea

利用一个三维斜压模式ROMS,对夏季和冬季的渤海流场、示踪物输运及扩散进行了简要模拟。模拟结果表明渤海环流在夏季和冬季呈现多涡环流模态,垂向平均流场更为突出,渤海各大港口排放的保守污染物浓度在80天左右后显著降低,不过影响范围呈现季节性分布,污染物的输运扩散受与流场紧密相关,渤海湾是影响最为严重的海域。

Based on the three-dimensional Regional Ocean Model System （ROMS）, the total reslclual current, transportation and diffusion of tracer in the Bohai Sea are diagnostically simulated. The modeled results show that the current in summer and winter performs the multi-eddy circulation mode, and the vertical mean currents are more significant. The concentration of tracer decreases significantly after about 80 days in summer and winter, but the affected range shows strong seasonal characteristic. The transportation and diffusion of tracers are closely related to currents and it is mostly affected in the Bohai Bay.