全球海洋的适当正交分解降阶模型

IF 2.2 3区工程技术 Q2 MECHANICS

Theoretical and Computational Fluid Dynamics Pub Date : 2024-09-19 DOI:10.1007/s00162-024-00719-9

Vassili Kitsios, Laurent Cordier, Terence J. O’Kane

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引用次数: 0

摘要

通过将流体静力学布辛斯克运动方程投影到适当的正交分解（POD）基础上，建立了全球海洋的降阶模式（ROM）。三维 POD 模式是根据集合气候再分析数据集的海洋场计算得出的。POD ROM 中的系数采用回归方法计算。评估了各种 POD ROM 配置的性能。每种配置都来自于一个将密度场和温度场联系起来的备用海水状态方程。POD ROM 变体包含密度是温度二次函数的状态方程，能够以数值模拟这种流动所需的计算成本的一小部分再现大规模结构的统计数据。由于计算速度快、效率高，这种全球地球物理系统的降阶模型将使研究人员和决策者能够评估未来更多潜在气候情景下的物理风险。

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Proper orthogonal decomposition reduced-order model of the global oceans

A reduced-order model (ROM) of the global oceans is developed by projecting the hydrostatic Boussinesq equations of motion onto a proper orthogonal decomposition (POD) basis. Three-dimensional POD modes are calculated from the ocean fields of an ensemble climate reanalysis dataset. The coefficients in the POD ROM are calculated using a regression approach. The performance of various POD ROM configurations are assessed. Each configuration is derived from an alternate sea-water equation of state, linking the density and temperature fields. POD ROM variants incorporating an equation of state in which density is a quadratic function of temperature, are able to reproduce the statistics of the large-scale structures at a fraction of the computational cost required to numerically simulate this flow. Due to the speed and efficiency of calculation, such reduced-order models of the global geophysical system will enable researchers and policy makers to assess the physical risk for a broader range of potential future climate scenarios.

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来源期刊

Theoretical and Computational Fluid Dynamics 物理-力学

CiteScore

5.80

自引率

2.90%

发文量

审稿时长

>12 weeks

期刊介绍： Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.