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Modeling studies of ocean circulation using inverse methods and bifurcation theory.

机译：使用逆方法和分叉理论对海洋环流进行建模研究。

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摘要

We present a study of the ocean circulation using state of the art numerical and data assimilation techniques. The second chapter of the thesis presents the development and application of generalized inversion to a simple dynamical model of Lake Kinneret. The intent was to develop the necessary tools to implement variational assimilation scheme in the realm of a simple model and data set. We were able to determine the spatially nonuniform wind pattern and distinguish it clearly from the effect of assuming a spatially uniform wind. We present statistical evidence for our finding that the two layer model contained sufficient detail to describe the physics of internal waves and residual circulation embedded in the data. We were also able to determine the time and location of an outcropping event that resulted in a fish kill event. The third chapter presents an in depth study of the multiple steady states of the Kuroshio south of Japan using a limited area 2 layer quasigeostrophic model. This study enabled us to understand the possible nature of the transitions and the dynamical nature of the steady states. The last chapter is a refinement of the understanding of the Kuroshio using the assimilation of satellite data to explain the recent transition from a non-large meander to a large meander and its opposite. The assimilation procedure can be seen as the test of a null hypothesis consisting of a prior estimate of the model and data discrepancy. The result of the assimilation gives us posterior statistics that permit us to draw error bars on the model dynamics. From these posterior statistics, we can determine if the model contains sufficient dynamics to explain physics present in the altimetry data.
机译：我们使用最新的数值和数据同化技术对海洋环流进行研究。本文的第二章介绍了广义反演在简单的金纳雷特湖动力学模型中的发展和应用。目的是开发必要的工具，以在简单模型和数据集的范围内实施变分同化方案。我们能够确定空间上不均匀的风型，并将其与假定空间上均匀风的影响清楚地区分。我们为发现提供了统计证据，该两层模型包含足够的细节来描述嵌入数据中的内部波和残留循环的物理性质。我们还能够确定导致鱼类死亡的露头事件发生的时间和地点。第三章使用有限区域2层准地转模型对日本南部黑潮的多个稳态进行了深入研究。这项研究使我们能够理解转变的可能性质和稳态的动力学性质。上一章使用对卫星数据的同化来解释黑潮，以解释最近从非大曲折到大曲折的转变及其反面。同化过程可以看作是对零假设的检验，该假设由模型的先验估计和数据差异组成。同化的结果为我们提供了后验统计信息，使我们能够在模型动力学上绘制误差线。从这些后验统计数据中，我们可以确定模型是否包含足够的动力学来解释测高数据中存在的物理现象。

著录项

  • 作者

    Vernieres, Guillaume.;

  • 作者单位

    Oregon State University.;

  • 授予单位 Oregon State University.;
  • 学科 Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;
  • 关键词

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