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Turbulent Oscillator: Intrinsic Eddy-Driven Decadal Variability of the Ocean

湍流振荡器：海洋固有涡驱动的年代际变化

基本信息

批准号：
NE/J006602/1
负责人：
Pavel Berloff
金额：
$ 37.79万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2012
资助国家：
英国
起止时间：
2012 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FJ006602%2F1
关键词：
Turbulent Oscillator Intrinsic Eddy Driven

项目摘要

We put forward the CENTRAL HYPOTHESIS that significant fraction of the observed oceanic variability is intrinsic, that is, driven by the internal dynamics of the ocean rather than by variations of the external forcings.Some of this variability is likely to be explained in terms of the transient linear modes of the climatological mean circulation, but most of it --- and this is our SECOND HYPOTHESIS --- is likely to be driven and controlled by the transient mesoscale eddies that constitute synoptic variability of the ocean and strongly interact with the large-scale circulation.The RESEARCH STRATEGY of this Project consists of several steps.First, we will employ a cutting-edge, idealized numerical model on the UK's national supercomputer HECToR and compute a set of pioneering solutions with explicitly and very well resolved eddies and with explicitly simulated large-scale low-frequency variability.All solutions will be computed in a systematic way, from physically more simple to more comprehensive, and the focus of the proposed modelling will be on the dynamical realism of the eddies and on the underlying fundamental physical processes.Our preliminary results demonstrate presence of the robust and significant, intrinsic large-scale low-frequency variability that interact with and is driven by the transient mesoscale eddies.Second, all solutions will be systematically analysed, and the outcome of this analysis will provide the basis for building a theory. At this point we will be guided, perhaps only initially, by the existing theoretical ideas.A very useful and efficient NETWORK OF COLLABORATIONS will connect this Project with the research groups engaged in observations, modelling, and understanding of the oceanic large-scale low-frequency variability and the underlying eddy effects.The INTELLECTUAL MERIT of this Project is in addressing poorly understood intrinsic variability of the ocean and the corresponding roles of the mesoscale eddies.The BROADER IMPACT is in terms of understanding the global climate variability, with the ultimate goal of acheiving more accurate predictions of the global climate change.The BROADER CONTEXT is that the underlying nonlinear mechanisms are likely to be pertinent to other parts of the global ocean.

我们提出了一个中心假设，即观测到的海洋变率的很大一部分是内在的，即由海洋内部动力驱动，而不是由外力的变化驱动。这种变异性中的一些可能可以用气候平均环流的瞬变线性模式来解释，但大多数--这是我们的第二个假设--很可能是由构成海洋天气变率并与大尺度环流强烈相互作用的瞬变中尺度涡旋驱动和控制的。本项目的研究策略包括几个步骤。首先，我们将采用尖端技术，在英国国家超级计算机Hector上建立理想化数值模式，计算一组具有显式和非常良好分辨率的涡旋和显式模拟的大尺度低频变化的开创性解。所有解都将以系统的方式进行计算，从物理上更简单到更全面，建议的模拟重点将放在涡旋的动力学现实性和基本物理过程上。我们的初步结果表明，与瞬变中尺度涡旋相互作用并受其驱动的强大而显著的内在大尺度低频变化的存在。第二，将对所有解进行系统分析。这一分析的结果将为理论的构建提供依据。在这一点上，我们将受到现有理论思想的指导。一个非常有用和有效的合作网络将把这个项目与从事海洋大尺度低频变化和潜在涡旋效应的观测、建模和理解的研究小组联系起来。这个项目的学术价值在于解决人们对海洋的内在变化和中尺度涡旋的相应作用知之甚少的问题。更广泛的影响是在理解全球气候变化方面，最终目标是获得对全球气候变化的更准确预测。更广泛的背景是，潜在的非线性机制可能与全球海洋的其他部分有关。