An Extended Eddy-Diffusivity Mass-Flux Scheme for Unified Representation of Subgrid-Scale Turbulence and Convection

Journal of Advances in Modeling Earth Systems
Zhihong TanJoão Teixeira

Abstract

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...Continue Reading

References

Sep 4, 2015·Nature·Peter BauerGilbert Brunet
Sep 26, 2017·Journal of Advances in Modeling Earth Systems·Kyle G PresselZhihong Tan
Dec 15, 2017·Surveys in Geophysics·Jessica VialRaphaela Vogel

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Citations

Oct 13, 2020·Journal of Advances in Modeling Earth Systems·Yair CohenTapio Schneider

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