The westward transversal current (TC) in the southern Yellow Sea entrance was investigated during winter 2007 using a numerical ocean model. The three-dimensional structures and dynamics of the westward TC were highlighted. The model-simulated monthly mean current fields showed that the strong westward TC was limited to the upper water column (shallower than 50 m) and extended westward from 126° E to 124° E. Momentum balance analysis indicated that the westward TC was mainly regulated by a quasi-geostrophic balance. Both the sea surface elevation–related barotropic pressure gradient force and the density-related baroclinic pressure gradient force controlled the intensity and direction of the westward TC. Sensitivity model experiments focusing on tide and wind demonstrated that the westward TC was intensified when tide was ignored and was greatly weakened when wind was excluded. Lagrangian particle tracking experiments were also performed, to investigate the relationship between the Yellow Sea Warm Current and the westward TC in the frontal region. The characteristics of the water in the Yellow Sea Warm Current were affected by the properties of the water in the frontal zone, especially in the sub-surface and lower layers. The westward TC might act as an important bridge, connecting the frontal zone with the Yellow Sea Warm Current flowing along the western Yellow Sea trough.

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模拟黄海南部入口处的西向横流：2007年冬季的案例研究

2007年冬季，使用数值海洋模型对黄海南部入口处的西向横流（TC）进行了研究。着重介绍了西气旋的三维结构和动力学。模型模拟的月平均流场表明，强西风TC仅限于上水柱（浅于50 m），并从126°E向西延伸至124°E。动量平衡分析表明，西风TC主要受到调节通过准地转平衡。海平面相关的正压梯度力和密度相关的斜压梯度力都控制着西风的强度和方向。针对潮汐和风的敏感性模型实验表明，当忽略潮汐时，向西的TC会增强，而当不包括风时，则大大减弱。还进行了拉格朗日粒子跟踪实验，以研究黄海暖流与额叶区西风带之间的关系。黄海暖流中水的特性受额叶区域（尤其是地下和下层）水质的影响。西边的热带气旋可能是重要的桥梁，将额带与沿黄海西部海槽流动的黄海暖流连接起来。研究黄海暖流与额叶区西风带的关系。黄海暖流中水的特性受额叶区域（尤其是地下和下层）水质的影响。西边的热带气旋可能是重要的桥梁，将额带与沿黄海西部海槽流动的黄海暖流连接起来。研究黄海暖流与额叶区西风带的关系。黄海暖流中水的特性受额叶区域（尤其是地下和下层）水质的影响。TC向西可能是重要的桥梁，将额带与沿西黄海槽流动的黄海暖流连接起来。