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Regional Superparameterization in a Global Circulation Model Using Large Eddy Simulations
- Source :
- Journal of Advances in Modeling Earth Systems, Vol 11, Iss 9, Pp 2958-2979 (2019), Journal of Advances in Modeling Earth Systems, 11(9), 2958-2979, Journal of Advances in Modeling Earth Systems, 11(9), Journal of Advances in Modeling Earth Systems, 11(9), 2958-2979. Wiley-Blackwell
- Publication Year :
- 2019
- Publisher :
- American Geophysical Union (AGU), 2019.
-
Abstract
- As a computationally attractive alternative for global large eddy simulations (LESs), we investigate the possibility of using comprehensive three‐dimensional LESs as a superparameterization that can replace all traditional parameterizations of atmospheric processes that are currently used in global models. We present the technical design for a replacement of the parameterization for clouds, convection, and turbulence of the global atmospheric model of the European Centre for Medium‐Range Weather Forecasts by the Dutch Atmospheric Large Eddy Simulation model. The model coupling consists of bidirectional data exchange between the global model and the high‐resolution LES models embedded within the columns of the global model. Our setup allows for selective superparameterization, that is, for applying superparameterization in local regions selected by the user, while keeping the standard parameterization of the global model intact outside this region. Computationally, this setup can result in major geographic load imbalance, because of the large difference in computational load between superparameterized and nonsuperparameterized model columns. To resolve this issue, we use a modular design where the local and global models are kept as distinct model codes and organize the model coupling such that all the local models run in parallel, separate from the global model. First simulation results, employing this design, demonstrate the potential of our approach.
- Subjects :
- Convection
010504 meteorology & atmospheric sciences
Computer science
Atmospheric model
01 natural sciences
010305 fluids & plasmas
Computational science
lcsh:Oceanography
0103 physical sciences
Environmental Chemistry
lcsh:GC1-1581
lcsh:Physical geography
0105 earth and related environmental sciences
Global and Planetary Change
business.industry
Turbulence
large eddy simulation
superparameterization
Modular design
Multiscale modeling
multiscale modeling
Coupling (computer programming)
Data exchange
General Earth and Planetary Sciences
model coupling
business
lcsh:GB3-5030
Large eddy simulation
Subjects
Details
- Language :
- English
- ISSN :
- 19422466
- Volume :
- 11
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Journal of Advances in Modeling Earth Systems
- Accession number :
- edsair.doi.dedup.....3a4e3b1a2f7d3a040ed80dd1d36349a7