Simulation of Deep Cycle Turbulence by a Global Ocean General Circulation Model
Simulation of Deep Cycle Turbulence by a Global Ocean General Circulation Model
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DOI：
10.1029/2020gl088384
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
S. Pei;T. Shinoda;Wanqiu Wang;R. Lien
中科院分区：
文献类型：
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作者：
S. Pei;T. Shinoda;Wanqiu Wang;R. Lien
深循环湍流(DCT)是一种日振荡湍流，它穿透到赤道潜流(EUC)上方的东太平洋和大西洋表层混合层下方的层状切变层中。本文首次用全球海洋环流模式(OGCM)对DCT进行了模拟。由于k-ε垂直混合方案的使用，可以清楚地演示基于原位微结构测量的观测到的离散余弦变换结构的模拟。模拟的DCT在所有赤道洋盆都有发现，其特征与观测结果吻合得很好。通过构造复合日循环，描述了整个赤道太平洋和大西洋DCT的纬向和经向变化。在与EUC相关的最大切变较深的中太平洋地区，DCT与地面混合层的分离比其他地区更为突出。
Deep cycle turbulence (DCT) is a diurnally oscillating turbulence that penetrates into a stratified shear layer below the surface mixed layer, which is often observed in the eastern Pacific and Atlantic above the Equatorial Undercurrent (EUC). Here we present the simulation of DCT by a global ocean general circulation model (OGCM) for the first time. As the k‐ε vertical mixing scheme is used in the OGCM, the simulation of observed DCT structure based on in situ microstructure measurements can be explicitly demonstrated. The simulated DCT is found in all equatorial ocean basins, and its characteristics agree very well with observations. Zonal and meridional variations of DCT in the entire equatorial Pacific and Atlantic are described through constructing the composite diurnal cycle. In the central Pacific where the maximum shear associated with EUC is deep, the separation of DCT from the surface mixed layer is much more prominent than other areas.