Numerical Methods for Large-Scale Modeling of Ocean Circulation

海洋环流大规模模拟的数值方法

基本信息

  • 批准号:
    9803331
  • 负责人:
  • 金额:
    $ 8.61万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    1998
  • 资助国家:
    美国
  • 起止时间:
    1998-08-01 至 2001-07-31
  • 项目状态:
    已结题

项目摘要

Higdon 9803331 The investigator develops improved algorithms for computing numerical simulations of ocean circulation. One motivation for this work is to improve the numerical methods used in the Miami Isopycnic Coordinate Ocean Model (MICOM), but this work also has broader application. MICOM is an operational ocean model that is currently being tested at Los Alamos National Laboratory and elsewhere for use in coupled, ocean-atmosphere models of the global climate system. This model presently uses a three-level timestepping scheme that, in practice, requires a restriction on the time step that is more severe than would be expected from standard theory. In addition, the model is affected by a computational mode consisting of nonphysical grid-scale oscillations, which are particularly stimulated by the behavior of MICOM's representation of the oceanic mixed layer. As an alternative, the present project investigates methods involving two time levels. Such methods have the potential of allowing a substantially longer time step, require less storage, and do not admit a computational mode. These methods are analyzed and implemented in conjunction with a barotropic-baroclinic time splitting, which is used to split the fast and slow motions into separate subsystems that are solved by different techniques. One application of computer models of ocean circulation is to aid in the study of the earth's climate system. For example, a major point of interest in climate modeling is the poleward transport of heat. If the atmosphere and ocean were held stationary, the tropical regions would be hotter than they actually are, and the polar regions would be colder. However, the movement of the atmosphere and ocean serves to moderate these extremes. Roughly half of the poleward transport of heat is due to the atmosphere, and half is due to the ocean. In the ocean, substantial transport is due to bulk movement by currents such as the Gulf Stream; another transport mechanism is the mixing caused by eddies that are shed from ocean currents due to hydrodynamic instability. A proper modeling of these phenomena requires high spatial resolution and computations over long time intervals, and climate-scale simulations of ocean circulation pose great computational challenges that strain the capabilities of the most powerful computers. The aim of the present project is to improve the efficiency and reliability of the algorithms that are used in such computations. A full-scale climate model would require both a model of the atmosphere and a model of the ocean, and these components must communicate in a way that simulates the interaction of the real atmosphere and ocean. The present project focuses on an existing ocean model that is being prepared at several sites for large-scale, coupled ocean-atmosphere simulations.
希格登9803331研究人员开发了改进的算法,用于计算海洋环流的数值模拟。这项工作的动机之一是改进迈阿密等厚坐标海洋模式(MICOM)中使用的数值方法,但这项工作也有更广泛的应用。MICOM是一个可运行的海洋模型,目前正在洛斯阿拉莫斯国家实验室和其他地方进行测试,用于全球气候系统的海洋-大气耦合模型。该模型目前使用三级时间步进方案,在实践中,该方案要求对时间步长的限制比标准理论预期的更严格。此外,该模式还受到由非物理网格尺度振荡组成的计算模式的影响,这一模式特别受到海洋混合层的Micom表示的行为的刺激。作为另一种选择,本项目调查涉及两个时间层次的方法。这样的方法有可能允许更长的时间步长,需要更少的存储,并且不允许计算模式。这些方法的分析和实现与正压-斜压时间分裂相结合,该时间分裂用于将快运动和慢运动分成不同的子系统,并用不同的技术进行求解。海洋环流的计算机模型的一个应用是帮助研究地球的气候系统。例如,气候模型的一个主要关注点是热量向极地的传输。如果大气和海洋保持不变,热带地区会比实际情况更热,极地地区会更冷。然而,大气和海洋的运动有助于缓和这些极端。大约一半向极地输送的热量来自大气,另一半来自海洋。在海洋中,大量的输送是由于墨西哥湾流等洋流的大量运动;另一种输送机制是由于流体动力不稳定而从洋流中脱落的涡流造成的混合。对这些现象的适当建模需要高空间分辨率和长时间间隔的计算,而气候尺度的海洋环流模拟带来了巨大的计算挑战,使最强大的计算机的能力变得紧张。本项目的目的是提高用于这类计算的算法的效率和可靠性。完整的气候模型既需要大气模型,也需要海洋模型,而且这些组件必须以模拟真实大气和海洋相互作用的方式进行通信。本项目的重点是正在几个地点为大规模海洋-大气耦合模拟准备的现有海洋模型。

项目成果

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Robert Higdon其他文献

Robert Higdon的其他文献

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{{ truncateString('Robert Higdon', 18)}}的其他基金

Numerical Methods for Layered Ocean Models
分层海洋模型的数值方法
  • 批准号:
    0511782
  • 财政年份:
    2005
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Standard Grant
Numerical Methods for Layered Models of Ocean Circulation
海洋环流分层模型的数值方法
  • 批准号:
    0107495
  • 财政年份:
    2001
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Standard Grant
Mathematical Sciences: Numerical Methods for Large-Scale Ocean Modeling
数学科学:大规模海洋建模的数值方法
  • 批准号:
    9407509
  • 财政年份:
    1995
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Standard Grant
Numerical Boundary Conditions for Wave Propagation and FluidDynamics
波传播和流体动力学的数值边界条件
  • 批准号:
    9103197
  • 财政年份:
    1991
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Standard Grant
Numerical Boundary Conditions for Wave Propagation Problems
波传播问题的数值边界条件
  • 批准号:
    8802649
  • 财政年份:
    1988
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Continuing Grant
Mathematical Sciences: Numerical Boundary Conditions for Wave Propagation Problems
数学科学:波传播问题的数值边界条件
  • 批准号:
    8601546
  • 财政年份:
    1986
  • 资助金额:
    $ 8.61万
  • 项目类别:
    Standard Grant

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Computational Methods for Analyzing Toponome Data
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