DOI: 10.1002/2017MS001162
Scopus记录号: 2-s2.0-85044245818
论文题名: An Extended Eddy-Diffusivity Mass-Flux Scheme for Unified Representation of Subgrid-Scale Turbulence and Convection
作者: Tan Z ; , Kaul C ; M ; , Pressel K ; G ; , Cohen Y ; , Schneider T ; , Teixeira J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期: 3 起始页码: 770
结束页码: 800
语种: 英语
英文关键词: Boundary layers
; Budget control
; Climate models
; Diffusion
; Dynamics
; Heat convection
; Kinetic energy
; Kinetics
; Life cycle
; Natural convection
; Parameterization
; Turbulence
; Weather forecasting
; Adjustable parameters
; Boundary layer dynamics
; Boundary layer turbulence
; Eddy Diffusivities
; Horizontal resolution
; Parameterization schemes
; Theoretical foundations
; Turbulence kinetic energy
; Atmospheric thermodynamics
英文摘要: Large-scale weather forecasting and climate models are beginning to reach horizontal resolutions of kilometers, at which common assumptions made in existing parameterization schemes of subgrid-scale turbulence and convection—such as that they adjust instantaneously to changes in resolved-scale dynamics—cease to be justifiable. Additionally, the common practice of representing boundary-layer turbulence, shallow convection, and deep convection by discontinuously different parameterizations schemes, each with its own set of parameters, has contributed to the proliferation of adjustable parameters in large-scale models. Here we lay the theoretical foundations for an extended eddy-diffusivity mass-flux (EDMF) scheme that has explicit time-dependence and memory of subgrid-scale variables and is designed to represent all subgrid-scale turbulence and convection, from boundary layer dynamics to deep convection, in a unified manner. Coherent up and downdrafts in the scheme are represented as prognostic plumes that interact with their environment and potentially with each other through entrainment and detrainment. The more isotropic turbulence in their environment is represented through diffusive fluxes, with diffusivities obtained from a turbulence kinetic energy budget that consistently partitions turbulence kinetic energy between plumes and environment. The cross-sectional area of up and downdrafts satisfies a prognostic continuity equation, which allows the plumes to cover variable and arbitrarily large fractions of a large-scale grid box and to have life cycles governed by their own internal dynamics. Relatively simple preliminary proposals for closure parameters are presented and are shown to lead to a successful simulation of shallow convection, including a time-dependent life cycle. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75636
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: California Institute of Technology, Pasadena, CA, United States; Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States; Jet Propulsion Laboratory, Pasadena, CA, United States
Recommended Citation:
Tan Z,, Kaul C,M,et al. An Extended Eddy-Diffusivity Mass-Flux Scheme for Unified Representation of Subgrid-Scale Turbulence and Convection[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(3)