Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes
Abstract
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 themore »
- Authors:
-
- California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Environmental Science and Engineering
- 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)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1682241
- Report Number(s):
- PNNL-SA-152361
Journal ID: ISSN 1942-2466
- Grant/Contract Number:
- AC05-76RL01830; AGS‐1835860; 80NM0018D0004
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 9; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; unified parameterization; convective parameterization; eddy‐diffusivity mass‐flux parameterization; entrainment and detrainment; deep convection; climate modeling
Citation Formats
Cohen, Yair, Lopez‐Gomez, Ignacio, Jaruga, Anna, He, Jia, Kaul, Colleen M., and Schneider, Tapio. Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes. United States: N. p., 2020.
Web. doi:10.1029/2020ms002162.
Cohen, Yair, Lopez‐Gomez, Ignacio, Jaruga, Anna, He, Jia, Kaul, Colleen M., & Schneider, Tapio. Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes. United States. https://doi.org/10.1029/2020ms002162
Cohen, Yair, Lopez‐Gomez, Ignacio, Jaruga, Anna, He, Jia, Kaul, Colleen M., and Schneider, Tapio. Tue .
"Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes". United States. https://doi.org/10.1029/2020ms002162. https://www.osti.gov/servlets/purl/1682241.
@article{osti_1682241,
title = {Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes},
author = {Cohen, Yair and Lopez‐Gomez, Ignacio and Jaruga, Anna and He, Jia and Kaul, Colleen M. and Schneider, Tapio},
abstractNote = {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.},
doi = {10.1029/2020ms002162},
journal = {Journal of Advances in Modeling Earth Systems},
number = 9,
volume = 12,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2020},
month = {Tue Aug 04 00:00:00 EDT 2020}
}
Figures / Tables:
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