气候变化领域集成服务门户(CCPortal): A New TKE-Based Parameterization of Atmospheric Turbulence in the Canadian Global and Regional Climate Models

CCPortal

DOI	10.1029/2018MS001532
	A New TKE-Based Parameterization of Atmospheric Turbulence in the Canadian Global and Regional Climate Models
	He Y.; McFarlane N.A.; Monahan A.H.
发表日期	2019
ISSN	19422466
起始页码	1153
结束页码	1188
卷号	11 期号:5
英文摘要	A new semi-empirical turbulence parameterization is presented. Key features of the scheme include representation of turbulent diffusivities in terms of the turbulent kinetic energy that is determined by solving a quasi-equilibrium form of the equation representing the turbulent kinetic energy budget. The new parameterization is innovative in the treatment of turbulent transfer in stably stratified conditions and the representation of nonlocal contributions to the vertical transport of heat, moisture, and scalar prognostic variables in convectively active boundary layers. A key element in the modeling of turbulence in stably stratified conditions is the formulation of the turbulent Prandtl number based on the results of recently published theoretical, modeling, and observational studies of stratified turbulence in the atmospheric boundary layer. The new parameterization has been implemented in the CanAM4 single column model. Its performance in comparison with that of the operational CanAM4 turbulence parameterization is documented in terms of selected results from case studies for clear-sky conditions based on meteorological observations from the KNMI-mast at Cabauw, Netherlands, and the Second Dynamics and Chemistry of Marine Stratocumulus case study of stratocumulus-topped marine boundary layers. The performance of the new and operational schemes is qualitatively similar in clear-sky conditions in both convective and stable boundary layer regimes. However, they perform differently for the extended simulations for the Second Dynamics and Chemistry of Marine Stratocumulus case study. The new scheme maintains an elevated stratocumulus layer throughout a 30-hr simulation, but peak liquid water contents are larger than large eddy simulations. ©2019. The Authors.
语种	英语
scopus关键词	Atmospheric boundary layer; Atmospheric chemistry; Atmospheric turbulence; Budget control; Climate models; Clouds; Computational fluid dynamics; Kinetic energy; Kinetics; Large eddy simulation; Parameterization; Prandtl number; Turbulent flow; Dynamics and chemistry of marine stratocumulus; Meteorological observation; Regional climate models; Stratocumulus-topped marine boundary layers; Turbulence parameterization; Turbulent diffusivities; Turbulent kinetic energy; Turbulent Prandtl number; Atmospheric thermodynamics; atmospheric forcing; boundary layer; clear sky; equation; kinetic energy; large eddy simulation; parameterization; qualitative analysis; regional climate; stratocumulus; turbulence; Cabauw; Netherlands; Utrecht [Netherlands]
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/156921
作者单位	Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC, Canada; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Canadian Centre For Climate Modelling and Analysis, University of Victoria, Victoria, BC, Canada
推荐引用方式 GB/T 7714	He Y.,McFarlane N.A.,Monahan A.H.. A New TKE-Based Parameterization of Atmospheric Turbulence in the Canadian Global and Regional Climate Models[J],2019,11(5).
APA	He Y.,McFarlane N.A.,&Monahan A.H..(2019).A New TKE-Based Parameterization of Atmospheric Turbulence in the Canadian Global and Regional Climate Models.Journal of Advances in Modeling Earth Systems,11(5).
MLA	He Y.,et al."A New TKE-Based Parameterization of Atmospheric Turbulence in the Canadian Global and Regional Climate Models".Journal of Advances in Modeling Earth Systems 11.5(2019).