中文摘要：

采用三维斜压非线性数值模式ROMS（Regional Ocean Modeling System）,在浙江沿岸特殊地形的基础上综合考虑风场、台湾暖流、潮流以及长江径流等可变因子,对春季浙江沿岸上升流进行了数值研究。研究结果表明,浙江沿岸春季存在上升流,且上升流以带状分布在浙江近岸海域,在渔山列岛附近（28.40°N,122.00°E）以及舟山群岛附近（30.70°N,122.60°-123.00°E）存在2个上升流中心。风、台湾暖流和潮动力是影响浙江沿岸春季上升流的重要因子,其中风和台湾暖流对浙江沿岸整条上升流带均有影响;潮动力仅对28.60°N纬度线以北至舟山群岛附近的上升流以及2个上升流中心的强度存在影响;长江径流对2个上升流中心、舟山群岛及长江口附近的上升流有一定影响。通过对浙江沿岸海域流场的分析可以发现,舟山群岛附近底层各等深线上水体向岸运动的速度比周围海域的大,跨越底层各等深线向上涌升的趋势更明显,间接反映了舟山群岛附近的上升流强度相对较强。对于舟山群岛附近的上升流而言,30m深度以浅的海域,科氏力、水平平流作用与垂直粘性力是上升流形成的主要动力,30m深度以深的海域,上升流形成的主要动力为科氏力与压强梯度力,此时水平平流作用和垂直粘性力对上升流的影响较弱。

英文摘要：

This paper took the Zhejiang coast as the research domain and a 3Dbaroclinic nonlinear numerical model was used to simulate coastal upwelling on the basis of special topography along Zhejiang coast,with some variable dynamic factors,such as wind,Taiwan Warm Current,tides,and Changjiang runoff,taken into account.The results show that upwelling in banding shape occurs along Zhejiang coast in spring,with the strong upwelling centers occurring near Yushan Islands（28.40°N,122.00°E）and Zhoushan Islands（30.70°N,122.60°-123.00°E）.The wind,Taiwan Warm Current,and tides are main inducements of upwelling.The wind and Taiwan Warm Current influence entire upwelling band.Tides affect the two strong upwelling centers and the upwelling between 28.60°N and Zhoushan Islands,which parallels the Zhejiang coast.Changjiang runoff affect the upwelling near Zhoushan Islands,Changjiang Estuary and the two centers of upwelling.The dynamic cause of currents demonstrates that onshore velocities at the bottom depth contours of 20m,30m,and 50mnear Zhoushan Islands are bigger than those surrounding areas.The phenomenon of upwelling is obvious.For the upwelling near Zhoushan,Coriolis force,horizontal advection,and vertical viscous force are main driving mechanisms of upwelling within 20-30m.Coriolis force and pressure gradient force are main forcing factors below 30m,while horizontal advection and vertical viscous force are weak.