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Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1029/2020ms002162· OSTI ID:1682241
 [1];  [1];  [2];  [1];  [3];  [2]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Environmental Science and Engineering
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Environmental Science and Engineering; California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
+ Show Author Affiliations
The extended Eddy Diffusivity Mass Flux (EDMF) scheme is used as a unied parameterization that simulates subgrid-scale dynamics across a range of regimes.This work presents unied entrainment and detrainment closures that allow this scheme to simulate the dry convective boundary layer, shallow convection and deep convection , while adjacent works present other necessary closures for this unied scheme and test its performance for stable, stratocumulus topped and convective boundary layers. Entrainment and detrainment are modeled as a combination of turbulent and dynamical processes. The turbulent component is taken as downgradient diffusion between subdomains. The dynamical component is based on a ratio of buoyancy and vertical velocity that ensures consistent treatment of the ratio of mass-flux at vanishing area fraction. Dynamical detrainment is controlled by the difference in relative humidity between subdomains when liquid water is present. These closures are rst evaluated with entrainment and detrainment diagnosed from Large Eddy Simulations where decaying tracers are used to identify the different subdomains and mass exchanges between them. When implemented in a single column model (SCM), these closures are tested in simulations of several observationally motivated cases of dry convective boundary layer, shallow convection and deep convection. Results show good agreement between the SCM and Large Eddy Simulations in key properties for climate models and profiles of first, second and third moments. The development of diurnal cycles and the onset of and precipitation (with simplified microphysics) are well predicted by the SCM.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1682241
Report Number(s):
PNNL-SA--152361
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Journal Issue: 9 Vol. 12; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (11)

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54 ENVIRONMENTAL SCIENCES
climate modeling
convective parameterization
deep convection
eddy‐diffusivity mass‐flux parameterization
entrainment and detrainment
unified parameterization