Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 46, Issue 11, Pages 6069-6079Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018GL081646
Keywords
deep neural networks; radiation models; general circulation models
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Funding
- DOE Office of Science User Facility [DE-AC05-00OR22725]
- Energy Exascale Earth System Model (E3SM) project - U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research
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Deep neural networks (DNNs) are implemented in Super-Parameterized Energy Exascale Earth System Model (SP-E3SM) to imitate the shortwave and longwave radiative transfer calculations. These DNNs were able to emulate the radiation parameters with an accuracy of 90-95% at a cost of 8-10 times cheaper than the original radiation parameterization. A comparison of time-averaged radiative fluxes and the prognostic variables manifested qualitative and quantitative similarity between the DNN emulation and the original parameterization. It has also been found that the differences between the DNN emulation and the original parameterization are comparable to the internal variability of the original parameterization. Although the DNNs developed in this investigation emulate the radiation parameters for a specific set of initial conditions, the results justify the need of further research to generalize the use of DNNs for the emulations of full model radiation and other parameterization for seasonal predictions and climate simulations.
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