Eddies and their Potential Role in the General Circulation

涡流及其在大气环流中的潜在作用

• 批准号: 0002295
• 负责人: Geoffrey Vallis
• 金额: $ 48.66万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002295&HistoricalAwards=false
• 关键词: Eddies; their; Potential; Role; General

0002295This project is an attempt to provide a better understanding of (a) processes determining the structure, distribution and scale content of the oceanic mesoscale field and (b) the role of mesoscale eddies in determining the large-scale structure of the ocean, looking in turn at the structure of the thermocline, abyssal flows, and structure of the mid-depth flows below the base of the thermocline. The physical effects that will be considered are broad-ranging and include, wind-forcing, mesoscale instabilities of large scale flows, the response of the ocean to stochastic forcing, adiabatic advection (ventilated thermocline dynamics), and eddy-topography interactions. The approach will be a combination of theory and numerical simulations. Much of the numerical simulation will be with stratified quasi-geostrophic models although some will use a primitive equation model (MOM4). The project will begin by looking at the life-cycles of baroclinic eddies in a broad, baroclinically unstable, wind-driven flow, studying their equilibration and the scaling of the vertical structure of the equilibrated eddies. The effects of inhomogeneity will be studied by stochastically forcing a quasigeostrophic model linearized about a time-mean wind-driven gyre. The project will go on to look at the role of the planetary and topographic vorticity gradients in introducing anisotropies in the nonlinear cascade of eddy energy in wavenumber space, leading to coherent and energetic deep flows. Lastly the role of mesoscale eddies in establishing the vertical structure of the thermocline will be examined using a primitive equation model.

0002295该项目试图更好地了解（a）确定海洋中尺度场的结构、分布和尺度内容的过程和（B）中尺度涡旋在确定海洋大尺度结构方面的作用，依次研究温跃层结构、深海流和温跃层底部以下中深流的结构。 将被考虑的物理效应是广泛的，包括，风强迫，大尺度流的中尺度不稳定性，海洋随机强迫的响应，绝热平流（通风温跃层动力学），和涡流地形相互作用。 该方法将是理论和数值模拟相结合。 大部分数值模拟将使用分层准地转模型，尽管有些将使用原始方程模型（MOM 4）。 该项目开始时将观察广泛的、斜压不稳定的、风力驱动的气流中斜压涡旋的生命周期，研究它们的平衡和平衡涡旋垂直结构的比例。 非均匀性的影响将通过随机强迫一个关于时间平均风驱动环流线性化的准地转模式来研究。 该项目将继续研究行星和地形涡度梯度在波数空间涡流能量的非线性级联中引入各向异性的作用，从而导致连贯和充满活力的深层流动。 最后，中尺度涡旋在建立温跃层垂直结构中的作用将用原始方程模式进行检验。