摘要:
浪致辐射应力及浪致混合效应,作为海洋上层两种重要的物理过程,由于当前理论中关于其分层效应及计算公式中的误差还不是非常清楚,目前还没有在浪流耦合模式中同时考虑.本文将一种基于浪致辐射应力及浪致混合效应的参数化方案加入由浪（WAVEWATCHⅢ）和流模式（POM）组成的耦合模式中.以台风＂格美＂（2006）为天气背景,进行了四组数值试验.结果表明：浪致混合效应加强了混合层的湍流,加大了动量及热量向下传递率,但对表面流场的规律性改变不明显.浪致辐射应力传递表面动量通量,同时,规律性地改变了水平流场.当同时考虑两种物理过程时,其效果叠加.海流作为一种重要的动力因子,对有效波高的高度和分布有显著影响,使得动量转移,有效波高增高.模拟时次的第48 h,流矢量差值的近惯性震荡以及顺时针旋转,可能是台风靠近时浪流耦合效应加强的信号.
Abstract:
The two important upper ocean physical processes, i.e., radiation stress and wave-induced mixing effects, have not been simulta- neously taken into consideration in the wave-current coupled parallel run models. Under the current formulations, neither the effect of stratification nor the error during computation is fully suggested. A new simplified parameterization scheme combining wave radiation stress with wave-induced mixing is introduced into a coupled model which consists of wave （WAVEWATCH III） and current （POM） model, and typhoon KAEMI （2006） is taken as the example to carry out four sets of experiments. The numerical experiments show that the turbulence enhanced by the wave-induced mixing in mixing layer transfers momentum and heat into down water layers, but in general, does not regularly change surface currents. The wave radiation stress transfers momentum horizontally, and thus it changes horizontal currents regularly. When both physical processes are included in this coupled model, two effects are superposed in the sim- ulation. As an important dynamic factor, the current affects the significant wave height and its distribution, which transfers horizontal momentum and makes significant wave height much higher in the present study. Furthermore, the current vector rotates clockwise at the time of the 48th hour due to the inertial oscillation probably being the signal of wave-current interaction amplified by the typhoon approaching.
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