| A 3-dimensional baroclinic circulation model of the South China Sea |
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| 作者姓名： | 蔡怡 李毓湘 |
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| 作者单位： | 蔡怡(Natimal Marine Environmental Forecasting Center,);李毓湘(Department of Civil＆Structural Engineering The Hong Kong Polytechnic University.)
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| 摘 要： | 1 INTRODUCTIONThe SoUth China Sea (SCS) is the largest coastal sea of China. It is of great interestto researchers because of its abundant resources and geographical location. The SCS is inthe tropicaI and sub-tropical monsoon wind zone of the north-western Pacific and isSurrounded by China, Vietnam, Malaysia, Indonesia and the Philippines. lt has a complicatedRecclved 2 l March 200ltoPograPhy and is cormected with the Peeific through thc Bashi Channel which has a dePthof over 3…
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A 3-dimensional baroclinic circulation model of the South China Sea |
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| Abstract: | The summer and winter circulations in the South China Sea (SCS) including the surface elevation and water temperature are simulated using the model described by Cai and Li (1996) with the monthly mean wind stress and air temperature field at the 1000 mb level from the European Centre for Medium-Range Weather Forecasts as inputs. The boundary conditions at Bashi Channel and Taiwan Strait are taken from the simulation results of the Kuroshio using the same numerical model with a grid size of 0.5°x0.5° and the results of Cai and Li (1996) as boundary conditions. The computational domain for the present paper is between 100°E and 123°E and between 4.5°N and 27°N. The horizontal resolution is 0.25°~0.25° and the vertical variations of the velocity components are resolved by 6 layers. The computed steady flow, temperature and elevation fields are consistent with the corresponding fields observed. In particular, the temperatureand elevation fields of the South China Sea Warm Current (SCSWC) have been successfully simulated. The paths of the branch of the Kuroshio entering the South China Sea (SCSBK) through Bashi Channel in winter and summer are discussed. It is tound that the SCSBK flows southward to the southern SCS from the coast of the Guangdong Province. A portion of the SCSBK returns to the Bashi Channel and subdivides again in deep waters in winter with a branch flows to the south along the coast of the Philippines instead of flowing back to the Pacific. In addition, our results confirmthe existence of a eastward current to the northeast of Dongsha in summer with the Kuroshio as its source as suggested by Huang et al. Since the value of the eddy viscosity adopted tor the simulation of the Kuroshio is on the high side, resulting in a veaker west boundary current in the western Pacific as the boundary conditions for the present simulations, some deviations from the actual situations are expected although the results are in general consistent with observations. |
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