The effect of wave‐induced turbulence on the ocean mixed layer during tropical cyclones: Field observations on the Australian North‐West Shelf
The effect of wave‐induced turbulence on the ocean mixed layer during tropical cyclones: Field observations on the Australian North‐West Shelf
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DOI：
10.1029/2011jc007780
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发表时间：
2012-11
影响因子：
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通讯作者：
A. Toffoli;J. McConochie;M. Ghantous;Layla Loffredo;A. Babanin
中科院分区：
文献类型：
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作者：
A. Toffoli;J. McConochie;M. Ghantous;Layla Loffredo;A. Babanin
[1]在数值模拟的支持下，对澳大利亚西北大陆架（东印度洋）水温的实地观测被用来证明，波浪轨道运动产生的湍流注入大大有助于上层海洋的混合。测量结果还表明，相当深的混合层发生在热带气旋，当生产波诱导的湍流动能克服了电流产生的剪切湍流的贡献。尽管一个显着的贡献，加深的混合层，背景电流和大气强迫的影响是不是自己能够证明观察到的加深的混合层通过大部分水柱。此外，通常浅混合层深度的变化，观察到在一个相对较短的时间尺度约10小时后，波活动的加强和消失后不久，风暴表面波的衰减。这种快速发展也往往排除任何重大贡献的波浪破碎，因为小的垂直扩散率破碎引起的湍流将需要更长的时间尺度来影响混合层的深度。
[1] Field observations of water temperature on the Australian North-West Shelf (Eastern Indian Ocean) with the support of numerical simulations are used to demonstrate that the injection of turbulence generated by the wave orbital motion substantially contributes to the mixing of the upper ocean. Measurements also show that a considerable deepening of the mixed layer occurs during tropical cyclones, when the production of wave-induced turbulent kinetic energy overcomes the contribution of the current-generated shear turbulence. Despite a significant contribution to the deepening of the mixed layer, the effect of a background current and atmospheric forcing are not on their own capable of justifying the observed deepening of the mixed layer through most of the water column. Furthermore, variations of a normally shallow mixed layer depth are observed within a relatively short timescale of approximately 10 hours after the intensification of wave activity and vanish soon after the decay of storm surface waves. This rapid development tends also to exclude any significant contribution by wave breaking, as small rates of vertical diffusivity for wave breaking-induced turbulence would require longer timescales to influence the depth of the mixed layer.