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- Title
A semi-implicit deep-atmosphere spectral dynamical kernel using a hydrostatic-pressure coordinate.
- Authors
Yang, Jinhui; Song, Junqiang; Wu, Jianping; Ying, Fukang; Peng, Jun; Leng, Hongze
- Abstract
Most of the present deep-atmosphere models are based on finite-difference schemes. This article proposes a novel deep-atmosphere non-hydrostatic spectral dynamical kernel with hydrostatic-pressure based terrain-following vertical coordinate. Contrary to finite-difference methods, a spectral transform method is used for the horizontal discretization. The prognostic variables in our dynamical kernel are analogous to the typical ALADIN-NH spectral model. A two time level semi-implicit semi-Lagrangian time-stepping scheme is applied to enable large time steps and improve the efficiency of integration. A set of test cases are conducted to evaluate the accuracy and stability of the deep-atmosphere dynamic kernel.
- Subjects
ATMOSPHERIC models; HYDROSTATIC pressure; FINITE difference method; LAGRANGE spectrum; KERNEL (Mathematics)
- Publication
Quarterly Journal of the Royal Meteorological Society, 2017, Vol 143, Issue 708, p2703
- ISSN
0035-9009
- Publication type
Article
- DOI
10.1002/qj.3119