15A.6 Tropical Cyclones in the non-hydrostatic GFDL HiRAM

Friday, 3 July 2015: 9:15 AM
Salon A-2 (Hilton Chicago)
Jan-Huey Chen, NOAA/GFDL, UCAR, Princeton, NJ; and S. J. Lin

A new, non-hydrostatic version of Geophysical Fluid Dynamics Laboratory (GFDL) High-Resolution Atmospheric Model (HiRAM) is being developed for tropical cyclone (TC) studies, with a focus on improving the climatology of TC genesis and landfall while maintaining the realism of the large-scale climate. This model marks a radical shift from the hydrostatic dynamics used by previous GFDL climate models. It uses a C384 (25 km) horizontal grid with 63 vertical levels, and includes many updates in the dynamical core, cloud microphysics and cloud convective parameterization. The long-term TC properties, e.g. storm counts, geographical distribution, and intensity, are examined in several climatology and AMIP(Atmospheric Model Intercomparison Project)-type simulations. We compare the results both to observations and to hydrostatic HiRAM which achieved a high prediction skill of Atlantic TCs.
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