| The Yellow and East China Seas cover the Yellow Sea, East China Sea and their adjacent waters. With complicated geographical environment and atmospheric and oceanic phenomena, Yellow and East China Seas is the crucial regions where many air-sea interaction phenomena frequently happen here. In recent years, some shipwreck and accident brought great death and estate loss. These were related with some disasterridden air and sea phenomena, which were mostly produced by the mesoscale air-sea interaction. As the good place for fish and shrimp, Yellow and East China Seas is one of the highest productive areas. It's important to set up the air-sea coupling model suitable to these areas not only for providing the useful numerical simulation tools for the research of the air-sea interaction but also can be as the scientific and dependable means for the exact weather forecast and sea environment forecast, which will work for protecting people from life and estate damage.In this paper the newest version of MM5- MM5V3, one of the most popular mesoscale atmospheric numerical model systems in current days, is chosen as the atmospheric model component. A updated 3D coastal ocean circulation model ECOM-si is chosen as the sea model component in the coupling model. After the brief introduction of importance and development of coupling model in chapter 1, chapter 2 goes on to introduce the two model components for coupling and put emphasis on the installation and the debugging of the MM5V3 model systems on the PC. The following chapter 3 describes the construction and the key technique of the coupling model. The coupling method for air-sea is presented according to the idea of air-sea interaction, and the modifications were made on the two models. The lower-layer boundary of air model component is forced by the sea surface temperature predicted by the ocean model, and the upper-layer boundary of the ocean model component is forced by the sea surface wind, sensible heat flux, latent heat flux as well as long wave radiation and short wave radiation. Here theinformation exchange is reached by the pipe communication technique under the Linux operating system. The air component and sea component can run at the same time and can exchange information at the exact time step. For the consistence of the two components, some changes are made for the different grid and different unit of exchangeable variables. In chapter 4, a passing cyclone over the Yellow and East China Seas in 1995 is chosen as the case to test the coupling model. The 36-hour simulation and experiment were done and corresponding result were also analyzed. Conclusion section is summarized in chapter 5. The simulation results indicate:(1) There's little difference for center pressure and location of cyclone between non-coupling and coupling simulation, So the air-sea coupling had littleeffect on the cyclone.(2) Air-sea coupling obviously changed the surface wind velocity, temperature, vertical motion and precipitation in the lower layer. The non-coupling overestimated the surface temperature 0.8K over Kuroshio area. And the wind velocity, precipation and vetical motion changes were separated into two parallel blocks. The northern block loaded over Kuroshio areas and the southern block loaded over the Liuqiu archipelago. The wind speed was overestimated 0.8m/s in southern block and underestimated 0.4m/s in northern block. The precipation was underestimated 1.5mm in southern block and 2mm overestimate in northern block. The vertical section along W-N indicated the non-coupling overstimated temperature and vertical velocity over Kuroshio areas. The vertical velocity increase in southern block and weaken in northern block after coupling. The phenomena occurred over Liuqiu archipelago need to be further studied.(3) The coupling also influenced the sea surface temperature (SST) over Kuroshio area and Taiwan Straits. SST decreases 1.0K at 12h and 1.4K at 18h over Kuroshio, Coast south of Korea peninsula has also decreases 0.8K at 12h and 1.2K at 1...
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