Near-Inertial Waves and Turbulence Driven by the Growth of Swell
Near-Inertial Waves and Turbulence Driven by the Growth of Swell
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DOI：
10.1175/jpo-d-20-0178.1
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发表时间：
2021-05-01
影响因子：
3.5
通讯作者：
Ferrari, Raffaele
中科院分区：
文献类型：
--
作者：
Wagner, Gregory L.;Chini, Gregory P.;Ferrari, Raffaele
大气和海洋之间传递的总动量的 5% 到 25% 是通过称为“涌浪”的长表面重力波的增长来传递的。在本文中，我们使用大涡模拟来表明，膨胀传递的动量会激发近惯性波并驱动湍流混合，从而加深旋转、分层、湍流的海洋表面边界层。我们发现，膨胀传输流在产生湍流和混合边界层方面不如有效表面应力驱动的流有效。然而，总体而言，膨胀驱动边界层和表面应力驱动边界层之间的差异相对较小。因此，我们的结果证实了地球系统模型中所做的假设，这些假设忽略了膨胀传递动量通量的垂直结构，而是用有效表面应力参数化所有空气-海洋动量传递过程。
Between 5% and 25% of the total momentum transferred between the atmosphere and ocean is transmitted via the growth of long surface gravity waves called "swell." In this paper, we use large-eddy simulations to show that swell-transmitted momentum excites near-inertial waves and drives turbulent mixing that deepens a rotating, stratified, turbulent ocean surface boundary layer. We find that swell-transmitted currents are less effective at producing turbulence and mixing the boundary layer than currents driven by an effective surface stress. Overall, however, the differences between swell-driven and surface-stress-driven boundary layers are relatively minor. In consequence, our results corroborate assumptions made in Earth system models that neglect the vertical structure of swell-transmitted momentum fluxes and instead parameterize all air-sea momentum transfer processes with an effective surface stress.