Implementation of a finite element method for the vertical discretization of KIAPS Integrated Model (KIM)
Abstract
As an attempt to improve numerical accuracy of the global numerical forecast model developed in Korea Institute of Atmospheric Prediction Systems (KIAPS), named as KIAPS Integrated Model (KIM) (Choi and Hong 2016), we have tried to implement the finite element method (FEM) for the vertical discretization. The main modifications are involved in the derivative and integral operators and the vertically no staggering grids. The vertical operators are defined using the linear and cubic splines as basis functions, the numerical accuracy of which is examined by using several idealized test cases. With combination of the horizontal spectral element and vertical FEM, the simulated results reveal that benefit of the high accuracy by FEM mainly appeared in inner domain away from the boundaries compared to the finite difference method (FDM). In 3D Hadley-like meridional advection test, for example, error norms produced by using FEM are much smaller. ReferenceChoi, S.-J. and S.-Y. Hong, 2016: A global non-hydrostatic dynamical core using the spectral element method on a cubed-sphere grid, Asia-Pac. J. Atmos. Sci., 52(3), 291-307.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.A34A..03P
- Keywords:
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- 3336 Numerical approximations and analyses;
- ATMOSPHERIC PROCESSESDE: 3337 Global climate models;
- ATMOSPHERIC PROCESSES