Scale Simulation And Baroclinic Adjustment Of Lagrange Circulation In The East China Sea

The basic power or reason, such as thermohaline circulation, wind-driven current or tidal residual circulation, can make ocean environment changing.The main work of this paper: using the dynamics theory of lagrange circulation by scale analysis, giving numerical scheme, establishing a three-dimension(3-D) baroclinic dynamics model, eventually simulating the circulation in East China Sea.A 3-D linear component tidal wave model is used to calculate tidal residual force,and Splitting Current Method is used to solve the currents of tide and circulation.The results of Tides(M2,S2,O1,K1) are basically consistent with measurement datas and then reflect the tidal characteristics of East China Sea very well. So based on these we can simulate the lagrange circulation in East China Sea much better.The zeroth order and first order circulations in winter and summer are simulated in East China Sea based on the 3-D dynamics model. The zeroth order circulations (surface and depth-averaged) approximatively reflect basic characteristics of the circulation in the East Sea.Total circulations (diagnostical baroclinic ones) reflect the current characteristics of East China Sea in winter and summer very well. The numerical results are basically consistent with measurement results.Results of lagrange circulations indicate: tidal residual circulations are more evident in the shallow water of the Yellow Sea and North of the East Sea, but weaker in the deep water and South of the East Sea shelf. Wind-driven circulations are more evident near coast, in winter strong wind-driven circulations flow south along the coast while in summer flow north weakly. The nonlinear effect of the zero-order circulations mainly represents following the way of the Kuroshio, by minishing the current and increasing the curl of the Kuroshio.Another important work: For the importance of thermohaline change to lagrangian circulation, an effective convergent difference format on hydrostatic consistent condition is used to solve baroclinic gradient force in sigma coordinate in...