A new approach to parameterizing ocean eddies: energetics, conservation and flow stability

海洋涡流参数化的新方法：能量学、守恒和流动稳定性

• 批准号: NE/H020454/1
• 负责人: David Marshall
• 金额: $ 41.96万
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FH020454%2F1
• 关键词: new; approach; parameterizing; ocean; eddies

The ocean is populated by a vigorous eddy field. These eddies are the oceanic analogue of weather systems in the atmosphere, but occur on a much smaller spatial scale due to the different densities of seawater and air, and differences in the vertical structure of the ocean and atmosphere. Ocean eddies also evolve on longer time scales, typically months, and can effect the global circulation on time scales up to millennia. Hence modelling the global circulation of the ocean is a much more challenging task than the atmosphere due to the greater range of spatial and temporal scales that must be captured. One consequence is that ocean climate models usually 'paramaterise' ocean eddies, that is, rather than simulate the eddies directly, the indirect effect of the eddies on the larger-scale circulation is represented by modifying the equations that are solved by the ocean model. This is a challenging task and eddy parameterisations are a source of great uncertainty in ocean climate projections. The aim of this project is to developed improved knowledge of how ocean eddies influence the large-scale ocean circulation and to developed improved eddy parameterisations. In particular, we aim to develop schemes that avoid doing things that we know are simply incorrect, such as introducing spurious sources of energy. By ensuring that our eddy parameterisations are consistent with fundamental physical principles, such as conservation of energy and angular momentum (an example of which loosely equates to the amount of water circulating around Antarctica), we believe that we can provide significant constraints on what ocean eddies can and cannot do. The new eddy parameterisations will be tested on a state-of-the-art computational ocean model.

海洋中充满了剧烈的涡流场。这些涡流类似于大气中的天气系统，但由于海水和空气的密度不同，以及海洋和大气的垂直结构的差异，发生在小得多的空间尺度上。海洋涡流也在较长的时间尺度上演化，通常是几个月，并且可以在长达数千年的时间尺度上影响全球环流。因此，由于必须捕获更大范围的空间和时间尺度，对海洋的全球环流进行建模是一项比大气更具挑战性的任务。结果之一是海洋气候模型通常将海洋涡流“参数化”，即不是直接模拟涡流，而是通过修改海洋模型求解的方程来表示涡流对更大规模环流的间接影响。这是一项具有挑战性的任务，涡流参数化是海洋气候预测中巨大不确定性的根源。该项目的目的是加深对海洋涡流如何影响大规模海洋环流的了解，并开发改进的涡流参数化。特别是，我们的目标是制定计划，避免做我们知道完全不正确的事情，例如引入虚假能源。通过确保我们的涡流参数化符合基本物理原理，例如能量守恒和角动量（其中一个例子大致等于南极洲周围循环的水量），我们相信我们可以对海洋涡流可以做什么和不能做什么提供重要的限制。新的涡流参数化将在最先进的计算海洋模型上进行测试。

项目成果

Rapid development and adjoining of transient finite element models

• DOI: 10.1016/j.cma.2014.03.010
• 发表时间: 2014-07
• 期刊: Computer Methods in Applied Mechanics and Engineering
• 影响因子: 7.2
• 作者: J. Maddison;P. Farrell

Rossby rip currents

• DOI: 10.1002/grl.50842
• 发表时间: 2013-08
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: D. Marshall;B. Vogel;Xiaoming Zhai

A Framework for Parameterizing Eddy Potential Vorticity Fluxes

• DOI: 10.1175/jpo-d-11-048.1
• 发表时间: 2012-04-01
• 期刊: JOURNAL OF PHYSICAL OCEANOGRAPHY
• 影响因子: 3.5
• 作者: Marshall, David P.;Maddison, James R.;Berloff, Pavel S.
• 通讯作者: Berloff, Pavel S.

On the dynamical influence of ocean eddy potential vorticity fluxes

• DOI: 10.1016/j.ocemod.2015.06.003
• 发表时间: 2015-08
• 期刊: Ocean Modelling
• 影响因子: 3.2
• 作者: J. Maddison;D. Marshall;J. Shipton

The Eliassen-Palm flux tensor

Eliassen-Palm 通量张量

• DOI: 10.1017/jfm.2013.259
• 发表时间: 2013
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Maddison J