Mean-state acceleration of cloud-resolving models and large eddy simulations: CRM AND LES MEAN-STATE ACCELERATION
Abstract
In this study, large eddy simulations and cloud-resolving models (CRMs) are routinely used to simulate boundary layer and deep convective cloud processes, aid in the development of moist physical parameterization for global models, study cloud-climate feedbacks and cloud-aerosol interaction, and as the heart of superparameterized climate models. These models are computationally demanding, placing practical constraints on their use in these applications, especially for long, climate-relevant simulations. In many situations, the horizontal-mean atmospheric structure evolves slowly compared to the turnover time of the most energetic turbulent eddies. We develop a simple scheme to reduce this time scale separation to accelerate the evolution of the mean state. Using this approach we are able to accelerate the model evolution by a factor of 2–16 or more in idealized stratocumulus, shallow and deep cumulus convection without substantial loss of accuracy in simulating mean cloud statistics and their sensitivity to climate change perturbations. As a culminating test, we apply this technique to accelerate the embedded CRMs in the Superparameterized Community Atmosphere Model by a factor of 2, thereby showing that the method is robust and stable to realistic perturbations across spatial and temporal scales typical in a GCM.
- Authors:
-
- Department of Atmospheric Sciences, University of Washington, Seattle Washington USA
- Department of Earth System Science, University of California, Irvine California USA
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1619305
- Alternate Identifier(s):
- OSTI ID: 1243064
- Grant/Contract Number:
- SC0012152; SC0012451; SC0012548
- Resource Type:
- Published Article
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 7 Journal Issue: 4; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Jones, C. R., Bretherton, C. S., and Pritchard, M. S. Mean-state acceleration of cloud-resolving models and large eddy simulations: CRM AND LES MEAN-STATE ACCELERATION. United States: N. p., 2015.
Web. doi:10.1002/2015MS000488.
Jones, C. R., Bretherton, C. S., & Pritchard, M. S. Mean-state acceleration of cloud-resolving models and large eddy simulations: CRM AND LES MEAN-STATE ACCELERATION. United States. https://doi.org/10.1002/2015MS000488
Jones, C. R., Bretherton, C. S., and Pritchard, M. S. Thu .
"Mean-state acceleration of cloud-resolving models and large eddy simulations: CRM AND LES MEAN-STATE ACCELERATION". United States. https://doi.org/10.1002/2015MS000488.
@article{osti_1619305,
title = {Mean-state acceleration of cloud-resolving models and large eddy simulations: CRM AND LES MEAN-STATE ACCELERATION},
author = {Jones, C. R. and Bretherton, C. S. and Pritchard, M. S.},
abstractNote = {In this study, large eddy simulations and cloud-resolving models (CRMs) are routinely used to simulate boundary layer and deep convective cloud processes, aid in the development of moist physical parameterization for global models, study cloud-climate feedbacks and cloud-aerosol interaction, and as the heart of superparameterized climate models. These models are computationally demanding, placing practical constraints on their use in these applications, especially for long, climate-relevant simulations. In many situations, the horizontal-mean atmospheric structure evolves slowly compared to the turnover time of the most energetic turbulent eddies. We develop a simple scheme to reduce this time scale separation to accelerate the evolution of the mean state. Using this approach we are able to accelerate the model evolution by a factor of 2–16 or more in idealized stratocumulus, shallow and deep cumulus convection without substantial loss of accuracy in simulating mean cloud statistics and their sensitivity to climate change perturbations. As a culminating test, we apply this technique to accelerate the embedded CRMs in the Superparameterized Community Atmosphere Model by a factor of 2, thereby showing that the method is robust and stable to realistic perturbations across spatial and temporal scales typical in a GCM.},
doi = {10.1002/2015MS000488},
journal = {Journal of Advances in Modeling Earth Systems},
number = 4,
volume = 7,
place = {United States},
year = {Thu Oct 29 00:00:00 EDT 2015},
month = {Thu Oct 29 00:00:00 EDT 2015}
}
https://doi.org/10.1002/2015MS000488
Web of Science
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