南海SCHISM模式不同垂向坐标研究

Contrastive study on different vertical coordinate settings of SCHISM model in the Nanhai Sea

基于SCHISM模式建立南海三维流场模式,进行了设置σ坐标、SZ坐标与局地σ坐标的数值模拟研究。结果表明,在不加同化条件下,垂向坐标对南海斜压环流和海温模拟有比较明显的影响,在越南外海尤为显著,σ坐标和局地σ坐标能够较好地模拟出越南外海的涡旋,SZ坐标对涡旋的模拟效果比较差,局地σ坐标对海温的模拟效果最好,而σ坐标对海温的模拟结果最差。总体而言,局地σ坐标可以兼顾南海斜压环流和海温模拟的要求。

Based on SCHISM model, a three-dimensional current model of the Nanhai Sea was established, and the numerical simulations of σ coordinate, SZ coordinate and local σ coordinate were carried out. Without assimilation, the results show that the vertical coordinates have significant influence on the simulations of baroclinic circulation and sea surface temperature in the Nanhai Sea, especially in Vietnam coast. The σ coordinate and the local σ coordinate can simulate the eddies in the offshore Vietnam well, while the SZ coordinate is not good at simulating the eddies. The local σ coordinate has the best effect on the sea surface temperature simulation, but simulation of the σ coordinate is the worst. In general, the local σ coordinates can meet the requirements of baroclinic circulation and sea surface temperature simulation in the Nanhai Sea.