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Effect of stratification and background flow on the frequency of Rossby basin modes in presence of bottom topography.

机译:在存在底部地形的情况下,分层和背景流对Rossby盆地模态频率的影响。

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摘要

This work attempts to express the change, induced by the introduction of stratification, of the Rossby eigen-modes of a closed basin with bottom topography, filled with a uniform fluid in the unperturbed configuration. Such a modification has been found in the output of a set of numerical experiments on the Argentine Basin and then computed analytically: stratification has been introduced in the mathematical form of a perturbation of a homogeneous fluid over a non flat bottom. It has been found that the eigen-modes lose their barotropic character and differences appear in the dynamical fields (velocity and pressure) from upper to lower layer. Moreover, the frequency of the modes changes; an analytical expression of this frequency correction as a function of stratification has been found. The impact on modal frequency of a geostrophic background flow has also been computed analytically. Some simple analytical results for an elementary geometrical setting have been determined.
机译:这项工作试图表达由分层引入的,具有底部地形的封闭盆地的Rossby本征模态的变化,该盆地以无扰动的构造填充了均匀的流体。在阿根廷盆地的一组数值实验的输出中发现了这种修改,然后进行了分析计算:分层以数学形式引入了非平坦底部上均质流体的扰动。已经发现,本征模失去了它们的正压特性,并且从上到下在动力场(速度和压力)中出现了差异。而且,模式的频率会改变。已经发现该频率校正作为分层函数的解析表达式。还通过分析计算了地转本底流对模态频率的影响。已经确定了基本几何设置的一些简单分析结果。

著录项

  • 作者

    Colantuono, Giuseppe.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Physical Oceanography.;Physics Fluid and Plasma.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 72 p.
  • 总页数 72
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;等离子体物理学;
  • 关键词

  • 入库时间 2022-08-17 11:38:28

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