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.

中文翻译：

---

全球海洋总环流模式模拟深循环湍流

深循环湍流（DCT）是一种昼夜振荡的湍流，它渗透到表面混合层以下的分层剪切层中，这种现象通常在东太平洋和大西洋赤道暗流（EUC）上方观察到。在这里，我们首次通过全球海洋总环流模型（OGCM）进行DCT模拟。作为ķ - ε在OGCM中使用垂直混合方案，可以显着地证明基于原位微观结构测量观察到的DCT结构的模拟。在所有赤道海盆都发现了模拟的DCT，其特征与观测结果非常吻合。通过构造复合的昼夜周期，描述了整个赤道太平洋和大西洋的DCT的纬向和经向变化。在与EUC相关的最大剪切力很深的太平洋中部，DCT与表面混合层的分离比其他地区要突出得多。