Parameterizing Mesoscale Ocean Eddies Over Bottom Topography

中尺度海洋涡旋在驱动大规模海洋环流(Hallberg和Gnanadesikan，2006年)和确定全球海洋分层(Karsten等人)方面发挥着关键作用。2003年)。因此，它们可能会影响全球和局部气候预测以及海洋热量和碳储存能力(Munday等人)。2014年)。因此，在气候模式中准确模拟中尺度海洋涡旋是未来气候预测的重要工具。然而，气候模式的分辨率很少足以显式地模拟涡旋，因此它们在气候模式中被参数化。气候模式中常用的参数化方案是Gent和McWilliams(以下简称GM90)的方案，其中涡旋诱导的速度被参数化为通过厚度扩散系数k的示踪剂的附加平流(Gent和McWilliams，1990)。GM90是一个非常成功的方案，已被大多数CMIP模型采用(Eyring等人)。2016)，并导致提高了粗分辨率海洋模型的精度(Danabasoglu等人)。(1994年)。GM90方案的一个明显缺陷是它无法对海底地形的变化做出反应。改进底层地形涡旋参数化的问题将是本项目的重点。

Mesoscale ocean eddies play a crucial role in driving large scale ocean circulation (Hallberg and Gnanadesikan 2006) and determining the global ocean stratification (Karsten et al. 2003). Consequently, they mayaffect global and localized climate predictions as well as ocean heat and carbon storage capacity (Munday et al. 2014). Accurate simulation of mesoscale ocean eddies in climate models is therefore an importanttool for future climate projections. However, the resolution of climate models is rarely sufficient for eddies to be explicitly simulated and they have therefore been parameterized in climate models.The prevailing parameterization scheme used in climate models is that of Gent and McWilliams (hereafter referred to as GM90) in which the eddy-induced velocity is parameterized as an additional advection oftracers via the thickness diffusivity, k (Gent and McWilliams, 1990). GM90 is a hugely successful scheme, having been adopted into most of the CMIP models (Eyring et al. 2016) and leading to improvements inthe accuracy of coarse resolution ocean models (Danabasoglu et al. 1994). One obvious flaw in the GM90 scheme is its inability to respond to variations in ocean floor topography. The problem of improving eddyparameterization over bottom topography will be the focus of this project.