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Sowing Storms: How Model Timestep Can Control Tropical Cyclone Frequency in a GCM
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2022
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Source: Journal of Advances in Modeling Earth Systems, 14(3)
[PDF-2.58 MB]
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Journal Title:Journal of Advances in Modeling Earth Systems
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Description:With general circulation models (GCMs) being increasingly used to explore extreme events over short temporal and small spatial scales, understanding how design choices in model configuration impact simulation results is critical. This research shows that the number of spontaneously generated tropical cyclones (TCs) in a version of the Community Atmosphere Model can be controlled by changing the coupling frequency between the dynamical core and physical parameterizations. More frequent coupling (i.e., shorter physics timesteps), even in the presence of an otherwise identical model, leads to large increases in TC activity. It is suggested that this arises due to competition within moist physics subroutines. Simulations with reduced
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Source:Journal of Advances in Modeling Earth Systems, 14(3)
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ISSN:1942-2466;1942-2466;
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Rights Information:CC BY-NC
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Compliance:Library
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