气候变化领域集成服务门户(CCPortal): Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1

CCPortal

DOI	10.1029/2020MS002052
	Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1
	Ma J.; Xu S.; Wang B.
发表日期	2020
ISSN	19422466
卷号	12 期号:9
英文摘要	Climate models contain atmospheric and oceanic components that are coupled together to simulate the thermodynamic and dynamic processes during air-sea interactions. Community Earth System Model (CESM version 1.2.1) is a state-of-the-art coupled model that is widely used and participates in Coupled Model Intercomparison Projects. Community Atmospheric Model (CAM), the atmospheric component of CESM, is based on the finite-volume dynamic core, which utilizes staggered Arakawa-D grids. However, the dynamics-physics (D-P) coupling in CAM causes the prognostic winds of the dynamic core be interpolated onto non-staggered locations, which affects the wind structure for computing the air-sea interaction and dynamical coupling. In this study we propose a new scheme that eliminates the extra interpolation during D-P coupling for the atmosphere-ocean interaction. We show that it improves the simulated climatology in key regions including eastern boundary upwelling regions and Southern Oceans. Compared with the default scheme, the new approach simulates strong surface wind near coast in eastern boundary upwelling regions. As a result, existing problems of the model, such as warm SST biases in these regions, are reduced. Meanwhile, for Southern Ocean, the prevailing westerlies are enhanced in new scheme, resulting in meridional sea ice transport. As a result, the overestimation of sea ice extent and negative bias in SST is reduced. This new scheme is generally applicable to coupled models with staggered dynamics-physics, such as spectral-element method based CAM. ©2020. The Authors.
英文关键词	air-sea interaction; coupled model; dynamics-physics coupling; interpolation
语种	英语
scopus关键词	Atmospheric thermodynamics; Climate models; Dynamics; Sea ice; Air sea interactions; Atmosphere-ocean interactions; Atmospheric components; Community atmospheric model; Coupled Model Intercomparison Project; Earth system model; Numerical diffusion; Spectral element method; Oceanography; air-sea interaction; climatology; finite element method; interpolation; numerical model; sea ice; sea surface temperature; surface wind; upwelling; westerly; Arakawa; Honshu; Japan; Kanto; Southern Ocean; Tokyo [Kanto]; Tokyo [Tokyo (PRF)]
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/156649
作者单位	Department of Earth System Science, Tsinghua University, Beijing, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; University Corporation for Polar Research, Beijing, China
推荐引用方式 GB/T 7714	Ma J.,Xu S.,Wang B.. Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1[J],2020,12(9).
APA	Ma J.,Xu S.,&Wang B..(2020).Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1.Journal of Advances in Modeling Earth Systems,12(9).
MLA	Ma J.,et al."Reducing Numerical Diffusion in Dynamical Coupling Between Atmosphere and Ocean in Community Earth System Model Version 1.2.1".Journal of Advances in Modeling Earth Systems 12.9(2020).