台风条件下朗缪尔环流对上层海洋混合的影响研究进展

Progress in the impacts of Langmuir Circulation in upper ocean mixing under typhoon condition

回顾了近10年来台风条件下朗缪尔环流影响上层海洋混合的研究进展,朗缪尔致湍流对海洋上混合层的形成和加深的重要作用已形成了基本共识,但对于朗缪尔致湍流对海洋上混合层的混合作用机制和程度仍然存在诸多不确定性。观测表明台风条件下台风眼附近的混合层平均湍流动能受到了较强的抑制,可能与台风不同位置朗缪尔致湍流的特征变异有关;台风条件下,现有的朗缪尔致湍流参数化方案在上层混合过程模拟中还有显著误差。在今后研究中,通过改进斯托克斯漂流剖面的计算方法,优化表征台风条件下海面状况的朗缪尔致湍流参数化计算方案,是进一步揭示台风条件下朗缪尔环流对海洋上层混合的影响机理的必要途径。

In this paper, the research advances in the impacts of Langmuir Circulation （LC） on ocean mixing under the typhoon condition in the past 10 years is reviewed. It has been widely recognized that Langmuir turbulence plays an important role in the forming and deepening of the upper mixed layer. But the mechanism and degree of the LC effects on the upper ocean mixing still have many uncertainties. Observations indicated that, under the ac- tion of typhoon, the average vertical kinetic energy of the mixed layer near the eye was strongly depressed, which may be related to the variation of the Langmuir induced turbulence at different locations of typhoon. Under ty- phoon condition, the existing Langmuir parameterization schemes have appreciable deviations when simulating the upper ocean mixing. Thus, in future studies, an improved approximation of the Stokes drift velocity profile and the explicitly resolving the sea-state-dependent Langmuir turbulence will lead to increased accuracy in predicting the o- cean response in coupled tropical cyclone-ocean models, that is a necessary way to reveal the mechanism of the LC effects on the upper ocean mixing under typhoon condition.