An oceanic general circulation model framed in hybrid isopycnic-Cartesian coordinates
An oceanic general circulation model framed in hybrid isopycnic-Cartesian coordinates
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DOI：
10.1016/s1463-5003(01)00012-9
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发表时间：
2002-01-01
期刊：
影响因子：
3.2
通讯作者：
Bleck, Rainer
中科院分区：
文献类型：
--
作者：
Bleck, Rainer
一个新开发的混合坐标海洋环流模式的文件和测试。只要不违反最小层厚度要求，该模型中的坐标曲面就遵循等密度线;在其他地方，坐标曲面受到几何约束。这种方法的目的是将等密坐标和固定网格环流模式的最佳特征联合收割机结合在一个框架内，其中一些特征让人想起任意拉格朗日欧拉（ALE）技术。混合模式是迈阿密等密度坐标海洋模式的一个分支，其解决方案，在相同的地理和强迫条件下获得，作为参考。在一个粗网格近全球域上进行的世纪尺度模拟显示，模拟的热盐强迫环流具有相当大的相似性。某些建筑细节，如预后热力学变量（ρ，S与T，S）的选择和算法移动坐标表面向他们的参考isopycnals，被发现只有轻微的影响的解决方案。本文的重点是混合坐标方法的数值弹性。在纯等密度坐标模式只有有限选择的海洋物理学领域，如混合层湍流参数化，利用模式的灵活坐标布局将是即将发表的文章的主题。(C)2001爱思唯尔科技有限公司版权所有。
A newly developed hybrid-coordinate ocean circulation model is documented and tested. Coordinate surfaces in this model adhere to isopycnals wherever this does not violate minimum layer thickness requirements; elsewhere, coordinate surfaces are geometrically constrained. The intent of this approach, some of whose features are reminiscent of the Arbitrary Lagrangian Eulerian (ALE) technique, is to combine the best features of isopycnic-coordinate and fixed-grid circulation models within a single framework. The hybrid model is an offshoot of the Miami Isopycnic Coordinate Ocean Model whose solutions, obtained under identical geographic and forcing conditions, serve as reference. Century-scale simulations on a coarse-mesh near-global domain show considerable similarities in the modeled thermohaline-forced circulation. Certain architectural details, such as the choice of prognostic thermodynamic variables (rho, S versus T, S) and the algorithm for moving coordinate surfaces toward their reference isopycnals, are found to only have a minor impact on the solution. Emphasis in this article is on the numerical resiliency of the hybrid coordinate approach. Exploitation of the model's flexible coordinate layout in areas of ocean physics where pure isopycnic coordinate models only have limited options, such as mixed-layer turbulence parameterization, will be the subject of forthcoming articles. (C) 2001 Elsevier Science Ltd. All rights reserved.