Open boundary conditions for long-term integration of regional oceanic models
Open boundary conditions for long-term integration of regional oceanic models
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DOI：
10.1016/s1463-5003(00)00013-5
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发表时间：
2001-01-01
期刊：
影响因子：
3.2
通讯作者：
Shchepetkin, Alexander
中科院分区：
文献类型：
--
作者：
Marchesiello, Patrick;McWilliams, James C.;Shchepetkin, Alexander
区域海洋模式可以有效地应用于区域和海岸的研究，只要找到一个令人满意的开边界条件（OBC）处方。本文提出了一种自适应算法，其中向内和向外的信息通量分开处理。由于不可压缩流体静力学原始方程的本质上是双曲线的性质，因此只需要向内边界通量的外部数据。用一种新的二维辐射算法处理向外通量。特别注意的是辐射相速度的估计，必不可少的检测边界通量的方向。边界条件的应用和评估美国西海岸（USWC）配置的区域海洋模拟系统（ROMS）。我们的指导原则是数值解在多年内保持稳定，达到有意义的统计平衡，并与现有的观测数据相一致。灵敏度分析表明，斜辐射是强大的，足够准确地检测信息通量的方向。自适应轻推充分结合了外部信息，最大限度地减少过度和不足的规格问题。此外，基于正压速度整体修正的体积约束改善了开边界条件的整体性能。(C)2001爱思唯尔科技有限公司版权所有。
Regional oceanic models can be developed and used efficiently for the investigation of regional and coastal domains, provided a satisfactory prescription for the open boundary conditions (OBCs) is found. We propose in this paper an adaptive algorithm where inward and outward information fluxes are treated separately. Because of the essentially hyperbolic nature of the incompressible, hydrostatic Primitive Equations, external data are required only for inward boundary fluxes. The outward fluxes are treated with a new algorithm for two-dimensional radiation. Special attention is given to the estimation of the radiation phase speed, essential for detecting the direction of boundary fluxes. The boundary conditions are applied and assessed on a US West Coast (USWC) configuration of the Regional Oceanic Modeling System (ROMS). Our guiding principles are that the numerical solution be stable over multiple years, reach a meaningful statistical equilibrium, and be realistic with respect to the available observational data. A sensitivity analysis suggests that the oblique radiation is robust and sufficiently accurate to detect the direction of information fluxes. The adaptive nudging adequately incorporates the external information minimizing over- and under-specification problems. In addition, a volume constraint based on global correction of normal barotropic velocities improves the overall performances of the open boundary conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.