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Title: Towards Unifying the Planetary Boundary Layer and Shallow Convection in CAM5 with the Eddy-Diffusivity/Mass-Flux Approach

Abstract

The modular structure of the boundary layer and convection parameterizations in atmospheric models have long been affecting the numerical representation of subgrid-scale motions and their mutual interactions. A promising alternative, the eddy-diffusivity/mass-flux approach (EDMF), has the potential for unifying the existing formulations into a consistent scheme and improving some of the long-standing issues. This study documents a step towards developing such a unified approach by implementing a stochastic multi-plume EDMF scheme into the Community Atmosphere Model (Version 5.0). Its performance in single-column mode is evaluated against the control parameterization and large-eddy simulation (LES) for two benchmark cases: marine and continental shallow convection. Overall, the results for the two parameterizations agree well with each other and with LES in terms of mean profiles of moist conserved variables and their vertical fluxes, as well as the updraft properties. However, systematic differences between the two schemes, especially for transient continental convection, are also documented. Using EDMF helps improve some of the parameterized features of shallow convection. In particular, for the highest tested vertical resolution, the EDMF cloud base and top heights and the vertical fluxes of energy and water are remarkably close to LES.

Authors:
ORCiD logo; ORCiD logo; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1558723
Grant/Contract Number:  
DOE SN30060 SC0012354
Resource Type:
Published Article
Journal Name:
Atmosphere (Basel)
Additional Journal Information:
Journal Name: Atmosphere (Basel) Journal Volume: 10 Journal Issue: 9; Journal ID: ISSN 2073-4433
Publisher:
MDPI AG
Country of Publication:
Switzerland
Language:
English

Citation Formats

J. Kurowski, Marcin, Thrastarson, Heidar Th., Suselj, Kay, and Teixeira, Joao. Towards Unifying the Planetary Boundary Layer and Shallow Convection in CAM5 with the Eddy-Diffusivity/Mass-Flux Approach. Switzerland: N. p., 2019. Web. doi:10.3390/atmos10090484.
J. Kurowski, Marcin, Thrastarson, Heidar Th., Suselj, Kay, & Teixeira, Joao. Towards Unifying the Planetary Boundary Layer and Shallow Convection in CAM5 with the Eddy-Diffusivity/Mass-Flux Approach. Switzerland. doi:10.3390/atmos10090484.
J. Kurowski, Marcin, Thrastarson, Heidar Th., Suselj, Kay, and Teixeira, Joao. Thu . "Towards Unifying the Planetary Boundary Layer and Shallow Convection in CAM5 with the Eddy-Diffusivity/Mass-Flux Approach". Switzerland. doi:10.3390/atmos10090484.
@article{osti_1558723,
title = {Towards Unifying the Planetary Boundary Layer and Shallow Convection in CAM5 with the Eddy-Diffusivity/Mass-Flux Approach},
author = {J. Kurowski, Marcin and Thrastarson, Heidar Th. and Suselj, Kay and Teixeira, Joao},
abstractNote = {The modular structure of the boundary layer and convection parameterizations in atmospheric models have long been affecting the numerical representation of subgrid-scale motions and their mutual interactions. A promising alternative, the eddy-diffusivity/mass-flux approach (EDMF), has the potential for unifying the existing formulations into a consistent scheme and improving some of the long-standing issues. This study documents a step towards developing such a unified approach by implementing a stochastic multi-plume EDMF scheme into the Community Atmosphere Model (Version 5.0). Its performance in single-column mode is evaluated against the control parameterization and large-eddy simulation (LES) for two benchmark cases: marine and continental shallow convection. Overall, the results for the two parameterizations agree well with each other and with LES in terms of mean profiles of moist conserved variables and their vertical fluxes, as well as the updraft properties. However, systematic differences between the two schemes, especially for transient continental convection, are also documented. Using EDMF helps improve some of the parameterized features of shallow convection. In particular, for the highest tested vertical resolution, the EDMF cloud base and top heights and the vertical fluxes of energy and water are remarkably close to LES.},
doi = {10.3390/atmos10090484},
journal = {Atmosphere (Basel)},
number = 9,
volume = 10,
place = {Switzerland},
year = {2019},
month = {8}
}

Journal Article:
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DOI: 10.3390/atmos10090484

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