کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4552576 | 1328736 | 2009 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Reconciling estimates of the free surface height in Lagrangian vertical coordinate ocean models with mode-split time stepping Reconciling estimates of the free surface height in Lagrangian vertical coordinate ocean models with mode-split time stepping](/preview/png/4552576.png)
In ocean models that use a mode splitting algorithm for time-stepping the internal- and external-gravity modes, the external and internal solutions each can be used to provide an estimate of the free surface height evolution. In models with time-invariant vertical coordinate spacing, it is standard to force the internal solutions for the free surface height to agree with the external solution by specifying the appropriate vertically averaged velocities; because this is a linear problem, it is relatively straightforward. However, in Lagrangian vertical coordinate ocean models with potentially vanishing layers, nonlinear discretizations of the continuity equations must be used for each interior layer. This paper discusses the options for enforcing agreement between the internal and external estimates of the free surface height, along with the consequences of each choice, and suggests an optimal, essentially exact, approach.
Journal: Ocean Modelling - Volume 29, Issue 1, 2009, Pages 15–26