Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Impact of the Dynamical Core on the Direct Simulation of Tropical Cyclones in a High-Resolution Global Model

TitleImpact of the Dynamical Core on the Direct Simulation of Tropical Cyclones in a High-Resolution Global Model
Publication TypeJournal Article
Year of Publication2015
AuthorsReed, K A., Bacmeister J T., Rosenbloom N A., Wehner M F., Bates S C., Lauritzen P H., Truesdale J E., and Hannay C
JournalGeophysical Research Letters
Volume42
Number9
Pages3603-3608
Abstract / Summary

This paper examines the impact of the dynamical core on the simulation of tropical cyclone (TC) frequency, distribution, and intensity. The dynamical core, the central fluid flow component of any general circulation model (GCM), is often overlooked in the analysis of a model's ability to simulate TCs compared to the impact of more commonly documented components (e.g., physical parameterizations). The Community Atmosphere Model version 5 is configured with multiple dynamics packages. This analysis demonstrates that the dynamical core has a significant impact on storm intensity and frequency, even in the presence of similar large‐scale environments. In particular, the spectral element core produces stronger TCs and more hurricanes than the finite‐volume core using very similar parameterization packages despite the latter having a slightly more favorable TC environment. The results suggest that more detailed investigations into the impact of the GCM dynamical core on TC climatology are needed to fully understand these uncertainties.

URLhttps://doi.org/10.1002/2015GL063974
DOI10.1002/2015GL063974
Journal: Geophysical Research Letters
Year of Publication: 2015
Volume: 42
Number: 9
Pages: 3603-3608
Publication Date: 05/2015

This paper examines the impact of the dynamical core on the simulation of tropical cyclone (TC) frequency, distribution, and intensity. The dynamical core, the central fluid flow component of any general circulation model (GCM), is often overlooked in the analysis of a model's ability to simulate TCs compared to the impact of more commonly documented components (e.g., physical parameterizations). The Community Atmosphere Model version 5 is configured with multiple dynamics packages. This analysis demonstrates that the dynamical core has a significant impact on storm intensity and frequency, even in the presence of similar large‐scale environments. In particular, the spectral element core produces stronger TCs and more hurricanes than the finite‐volume core using very similar parameterization packages despite the latter having a slightly more favorable TC environment. The results suggest that more detailed investigations into the impact of the GCM dynamical core on TC climatology are needed to fully understand these uncertainties.

DOI: 10.1002/2015GL063974
Citation:
Reed, KA, JT Bacmeister, NA Rosenbloom, MF Wehner, SC Bates, PH Lauritzen, JE Truesdale, and C Hannay.  2015.  "Impact of the Dynamical Core on the Direct Simulation of Tropical Cyclones in a High-Resolution Global Model."  Geophysical Research Letters 42(9): 3603-3608.  https://doi.org/10.1002/2015GL063974.