气候变化领域集成服务门户(CCPortal): Analysis of and Solution to the Polar Numerical Noise Within the Shallow-Water Model on the Latitude-Longitude Grid

CCPortal

DOI	10.1029/2020MS002047
	Analysis of and Solution to the Polar Numerical Noise Within the Shallow-Water Model on the Latitude-Longitude Grid
	Li J.; Wang B.; Dong L.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	This study conducts an analysis of the polar numerical noise in the barotropic shallow-water version of the Grid-point Atmospheric Model of IAP LASG (GAMIL-SW) and provides a good solution to the problem. GAMIL-SW suffers from numerical noise in the polar region in some ideal test cases, which is likely to be detrimental to the full physical model. The noise is suspected to be related to the nonlinear advection term in the momentum equation. Thus, a new shallow-water model with a vector-invariant form of the momentum equation is developed on the latitude-longitude grid to analyze the polar noise. It is found that the version with meridional wind component staggered on the pole is free from noise, while the version with zonal wind component staggered on the pole is still contaminated. By redefining the polar relative vorticity, the polar noise is eliminated in the latter version, and the global conservation properties are maintained. In addition, the test cases demonstrate that the new shallow-water model maintains the properties of the original GAMIL-SW with respect to numerical accuracy and computational stability. This study helps to identify appropriate governing equations to further develop the next generation of GAMIL dynamical core. © 2020. The Authors.
语种	英语
scopus关键词	Fiber optic sensors; Nonlinear equations; Poles; Computational stability; Conservation properties; Governing equations; Latitude longitude grid; Numerical accuracy; Relative vorticity; Shallow water model; Vector-invariant form; Numerical models; accuracy assessment; advection; computer simulation; meridional circulation; momentum; polar region; potential vorticity; shallow water; zonal wind
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156669
作者单位	State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li J.,Wang B.,Dong L.. Analysis of and Solution to the Polar Numerical Noise Within the Shallow-Water Model on the Latitude-Longitude Grid[J],2020,12(8).
APA	Li J.,Wang B.,&Dong L..(2020).Analysis of and Solution to the Polar Numerical Noise Within the Shallow-Water Model on the Latitude-Longitude Grid.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Li J.,et al."Analysis of and Solution to the Polar Numerical Noise Within the Shallow-Water Model on the Latitude-Longitude Grid".Journal of Advances in Modeling Earth Systems 12.8(2020).