The Numerical Simulation Of Yellow And East China Seas Circulation And Its Response To Typhoon

China lies east to Pacific Ocean and includes Tropical Zone, Subtropical Zone and Mid-latitude Zone. Continent coastal dimate is variable. The Bohai, Yellow and East China Seas connect together. They lie east to the largest continent and west of the deepest ocean. The water masses formation and variety have many characteristics and the synoptic become complex. Study of Yellow and East Seas circulation and study of sea response to the strong climate forcing can provide theoretical basis to forecast the climate and sea environment. They also could contribute to protect life and wealth from nature disaster. The paper aim to study the main characteristics of Yellow and East China Seas circulation and dynamical response of upper ocean to the strong atmospheric forcing. The main methods to study it are satellite, observation, buoy and numerical simulation. Numerical simulation has been successfully used in this paper. A famous coastal ocean model ECOM-si is been introduced and updated. The high-resolution grid of the Yellow and East China Seas is constructed. The updated model with complete forcing has excellent ability of simulation and forecast.To study Yellow and East China circulation in winter and summer, based on long-term ocean observation data of January and August, the fine structure of Yellow and East China Seas Circulation is diagnostically calculated with complete forcing (including surface wind stress, boundary transportation, baroclinic effect, tide, Changjiang River runoff) in winter. The influences of factors on main circulation patterns are discussed respectively. The numerical simulation with complete forcing produces the main characteristics of Yellow and East China Seas Circulation in winter. Results also indicate that the intensity of most current pattern is in general weakened by coast tide, such as Yellow Sea Warm Current(YSWC). However tide strengthens Cheju Warm Current and modifies east the path of YSWC and deduces upwelling and descent current near the entrance of Changjiang River. Surface wind stress contributes 10 the formation of Yellow and East China Seas Circulation in winter, and it also plays a significant role on the subsurface YSWC and surface coast currents of Yellow and East China Sea, Korean West Coast. An anticlockwise gyre near the Kuroshio north of Japan Inland is simulated using a high-resolution topography. The numerical simulation with complete forcing produces the main characteristics ofYellow and East China Seas Circulation in summer. Baroclinic effect plays a important role on Yellow Seas Circulation that Yellow Seas Cold Water Mass induces a anticlockwise circulation. Tide also strengthens it. The effect of wind is weak. Taiwan Warm Currents are mainly from sea wa^rs transported in Taiwan Strait and can be seen clearly in the middle of East China Seas. Taiwan Warm Currents is the source of Tsushimn Warm Currents. Results are not found that Kuroshio contributes to the Tsushimn Warm Current directly. Changjiang River Diluted Water(CRDW) turns to north at Changjiang Estuary and turns to east latterly. The southeast monsoon is the key factor and tide also contributes to it.That Yellow and East China Seas response to a typhoon case (WINNIE, 1997) is also simulated in the paper. The result indicates that the typhoon process has a significant influence to the seas. SST decreases in the large region and the affected depth is about 100m. Entrainment and Ekman pumping are key factors. In addition, flux transports also contribute to it. Typhoon makes mixed layer deeper. The SST change of right side is greater than that of left side. Typhoon vortex induces a cyclonic current on upper ocean and sea surface subsidence relevant with storm surge. The location is not consistent with the typhoon center strictly. The coast sea surface become higher and higher because of storm tide, but the occur time of highest sea surface seem to difference. The highest sea surface time of southern place occurs before the typhoon landed, therefore, the highest sea surface time of northe...