气候变化领域集成服务门户(CCPortal): Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model

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DOI	10.5194/gmd-17-335-2024
	Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model
	Mortezazadeh, Mohammad; Cossette, Jean-Francois; Dastoor, Ashu; de Grandpre, Jean; Ivanova, Irena; Qaddouri, Abdessamad
发表日期	2024
ISSN	1991-959X
EISSN	1991-9603
起始页码	17
结束页码	1
卷号	17 期号:1
英文摘要	The interpolation process is the most computationally expensive step of the semi-Lagrangian (SL) approach for solving advection and is commonly used in numerical weather prediction (NWP) models. It has a significant impact on the accuracy of the solution and can potentially be the most expensive part of model integration. The sweep algorithm, which was first described by Mortezazadeh and Wang (2017), performs SL interpolation with the same computational cost as a third-order polynomial scheme but at the accuracy of the fourth order. This improvement is achieved by using two third-order backward and forward polynomial interpolation schemes in two consecutive time steps. In this paper, we present a new application of the sweep algorithm within the context of global forecasts produced with Environment Climate Change Canada's Global Environmental Multiscale (GEM) model. Results show that the SL scheme with sweep interpolation is computationally more efficient compared to a conventional SL scheme with fourth-order polynomial interpolation, especially when a very large number of passive tracers are advected. An additional advantage of this new approach is that its implementation in a chemical and weather forecast model requires minimum modifications of the interpolation weighting coefficients. An analysis of the computational performance for a set of theoretical benchmarks as well as a global ozone forecast experiment show that up to 15 % reduction in total wall clock time is achieved. Forecasting experiments using the global version of the GEM model and the new interpolation show that the sweep interpolation can perform very well in predicting ozone distribution, especially in the tropopause region, where transport processes play a significant role.
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001168881000001
来源期刊	GEOSCIENTIFIC MODEL DEVELOPMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299345
作者单位	Environment & Climate Change Canada; Environment & Climate Change Canada
推荐引用方式 GB/T 7714	Mortezazadeh, Mohammad,Cossette, Jean-Francois,Dastoor, Ashu,et al. Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model[J],2024,17(1).
APA	Mortezazadeh, Mohammad,Cossette, Jean-Francois,Dastoor, Ashu,de Grandpre, Jean,Ivanova, Irena,&Qaddouri, Abdessamad.(2024).Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model.GEOSCIENTIFIC MODEL DEVELOPMENT,17(1).
MLA	Mortezazadeh, Mohammad,et al."Sweep interpolation: a cost-effective semi-Lagrangian scheme in the Global Environmental Multiscale model".GEOSCIENTIFIC MODEL DEVELOPMENT 17.1(2024).