Spatially Extended Tests of a Neural Network Parametrization Trained by Coarse‐Graining
Abstract
General circulation models (GCMs) typically have a grid size of 25–200 km. Parametrizations are used to represent diabatic processes such as radiative transfer and cloud microphysics and account for subgrid-scale motions and variability. Unlike traditional approaches, neural networks (NNs) can readily exploit recent observational data sets and global cloud-system resolving model (CRM) simulations to learn subgrid variability. This article describes an NN parametrization trained by coarse-graining a near-global CRM simulation with a 4-km horizontal grid spacing. The NN predicts the residual heating and moistening averaged over (160 km)2 grid boxes as a function of the coarse-resolution fields within the same atmospheric column. This NN is coupled to the dynamical core of a GCM with the same 16-km resolution. A recent study described how to train such an NN to be stable when coupled to specified time-evolving advective forcings in a single-column model, but feedbacks between NN and GCM components cause spatially extended simulations to crash within a few days. Analyzing the linearized response of such an NN reveals that it learns to exploit a strong synchrony between precipitation and the atmospheric state above 10 km. Removing these variables from the NN's inputs stabilizes the coupled simulations, which predict the future state more accuratelymore »
- Authors:
-
- Department of Atmospheric SciencesUniversity of Washington Seattle WA USA
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- Univ. of Washington, Seattle, WA (United States); USDOE Office of Science (SC)
- OSTI Identifier:
- 1567951
- Alternate Identifier(s):
- OSTI ID: 1567953; OSTI ID: 1611814
- Grant/Contract Number:
- SC0012451; SC0016433
- 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: 11 Journal Issue: 8; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences
Citation Formats
Brenowitz, Noah D., and Bretherton, Christopher S. Spatially Extended Tests of a Neural Network Parametrization Trained by Coarse‐Graining. United States: N. p., 2019.
Web. doi:10.1029/2019MS001711.
Brenowitz, Noah D., & Bretherton, Christopher S. Spatially Extended Tests of a Neural Network Parametrization Trained by Coarse‐Graining. United States. https://doi.org/10.1029/2019MS001711
Brenowitz, Noah D., and Bretherton, Christopher S. Thu .
"Spatially Extended Tests of a Neural Network Parametrization Trained by Coarse‐Graining". United States. https://doi.org/10.1029/2019MS001711.
@article{osti_1567951,
title = {Spatially Extended Tests of a Neural Network Parametrization Trained by Coarse‐Graining},
author = {Brenowitz, Noah D. and Bretherton, Christopher S.},
abstractNote = {General circulation models (GCMs) typically have a grid size of 25–200 km. Parametrizations are used to represent diabatic processes such as radiative transfer and cloud microphysics and account for subgrid-scale motions and variability. Unlike traditional approaches, neural networks (NNs) can readily exploit recent observational data sets and global cloud-system resolving model (CRM) simulations to learn subgrid variability. This article describes an NN parametrization trained by coarse-graining a near-global CRM simulation with a 4-km horizontal grid spacing. The NN predicts the residual heating and moistening averaged over (160 km)2 grid boxes as a function of the coarse-resolution fields within the same atmospheric column. This NN is coupled to the dynamical core of a GCM with the same 16-km resolution. A recent study described how to train such an NN to be stable when coupled to specified time-evolving advective forcings in a single-column model, but feedbacks between NN and GCM components cause spatially extended simulations to crash within a few days. Analyzing the linearized response of such an NN reveals that it learns to exploit a strong synchrony between precipitation and the atmospheric state above 10 km. Removing these variables from the NN's inputs stabilizes the coupled simulations, which predict the future state more accurately than a coarse-resolution simulation without any parametrizations of subgrid-scale variability, although the mean state slowly drifts.},
doi = {10.1029/2019MS001711},
journal = {Journal of Advances in Modeling Earth Systems},
number = 8,
volume = 11,
place = {United States},
year = {2019},
month = {8}
}
https://doi.org/10.1029/2019MS001711
Web of Science
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