Parameterisation of meso-scale mixing in the ocean

海洋中尺度混合的参数化

• 批准号: 191683119
• 负责人: Professor Dr. Carsten Eden
• 金额: --
• 依托单位: Institut für Meereskunde (IMee)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/191683119?language=en
• 关键词: Parameterisation; meso; scale; mixing; ocean

Ocean models which do not resolve the energetic meso-scale eddy field have to parameterise its effects on the large-scale circulation. This effect is for instance important in western boundary currents, where meso-scale eddies balances the planetary vorticity change, and in the Southern Ocean where they control both the zonal ow and the meridional overturning circulation. Further, meso-scale eddies are important for the ventilation of the interior ocean with dissolved gases. In current ocean climate models, a constant lateral diffusivity K appropriate to the Gent and McWilliams (1990) parameterisation is used. However, a constant diffusivity K is inadequate for climate change simulations and decadal climate predictions, since K does vary both in time and in space. We propose to advance the current meso-scale eddy parameterisation in ocean climate models by applying and improving a mixing length approach for K, based on an eddy kinetic energy (EKE) budget, an eddy length scale and a vertical structure function. The parameters in the EKE budget and the structure function will be estimated using a global ocean model and its adjoint constraining the model and the closure to observational estimates.

不解析高能中尺度涡旋场的海洋模式必须参数化其对大尺度环流的影响。例如，这种效应在西部边界流中很重要，在那里，中尺度涡旋平衡了行星涡度的变化，在南大洋中，它们控制着纬向低压和经向翻转环流。此外，中尺度涡旋对海洋内部溶解气体的通风也很重要。在目前的海洋气候模式中，使用了适合于Gent和McWilliams（1990）参数化的恒定横向扩散系数K。然而，恒定的扩散系数K对于气候变化模拟和年代际气候预测是不够的，因为K在时间和空间上都是变化的。我们建议应用和改进基于涡动能（EKE）预算、涡长度尺度和垂直结构函数的K混合长度方法，以推进当前海洋气候模式中的中尺度涡参数化。EKE预算和结构函数中的参数将使用全球海洋模式及其伴随的模式约束和对观测估计的封闭来估计。

项目成果

Comparing isopycnal eddy diffusivities in the Southern Ocean with predictions from linear theory

• DOI: 10.1016/j.ocemod.2015.08.001
• 发表时间: 2015-10
• 期刊: Ocean Modelling
• 影响因子: 3.2
• 作者: A. Griesel;C. Eden;Nikolaus Koopmann;E. Yulaeva

Implementing diffusivities from linear stability analysis in a three-dimensional general circulation ocean model

在三维大气环流海洋模型中实现线性稳定性分析的扩散性

• DOI: 10.1016/j.ocemod.2012.08.001
• 发表时间: 2012
• 期刊: Ocean Modelling
• 影响因子: 3.2

A wind-driven model of the ocean surface layer with wave radiation physics

基于波浪辐射物理的海洋表层风驱动模型

• DOI: 10.1007/s10236-020-01376-2
• 发表时间: 2020
• 期刊: Ocean Dynamics
• 影响因子: 2.3
• 作者: Olbers;Jurgenowski;Philipp;Carsten
• 通讯作者: Carsten