沿岸上升流和沿岸急流的一个半解析理论

A SEMI-ANALYTICAL THEORY OF COASTAL UPWELLING AND JET

在考虑了陆架地形后 ,在垂直海岸的x z剖面上 ,对Boussinesq流体的非线性海洋运动方程求得了总动量守恒、温度守恒和位势涡度守恒的普适形式 ,进而得到流函数所满足的椭圆型二阶偏微分方程 ,在给定流体沿地形运动的条件下 ,算出问题的解 .计算结果表明 ,沿岸可以出现上升流也可以出现下沉流 ,它依赖于海洋的大尺度背景条件 .计算所得的上升流、沿岸急流、温度的锋区结构与一些观测事实接近 .

The general forms of the conservation of momentum, temperature and potential vorticity of coastal ocean are obtained in the x-z plane for the nonlinear ocean circulation of Boussinesq fluid, and a elliptic type partial differential equations of second order are derived. Solution of the partial differential equations are obtained under the conditions that the fluid moves along the topography. The numerical results show that there exist both upwelling and downwelling along coastline that mainly depends on the large scale ocean condition. Numerically results of the upwelling (downwelling), coastal jet and temperature front zone are favorable to the observations.