109 Effects of Ice Microphysics on Hurricane Intensity

Thursday, 3 April 2014
Golden Ballroom (Town and Country Resort )
Casey Peirano, University at Albany, SUNY, Albany, NY; and J. Straka, C. P. Riedel, and O. Kintigh

High-resolution (750m) model simulations of tropical cyclones were run using a 15-bulk ice microphysics scheme in the Straka Atmospheric Model. Simulations were run using different sea surface temperatures to gauge the effect of ice microphysics on hurricanes of different strengths. These model runs are compared to Kessler liquid-only microphysics to attempt to determine the effect of ice microphysics on hurricane structure and intensity change. Specifically, reflectivity, pressure perturbation, and vertical velocity are analyzed in this research. Model simulations show that the implementation of ice microphysics causes hurricanes to grow stronger, develop a more pronounced banding pattern, and develop localized, strong updrafts compared to liquid-only simulations. Not all strengths of hurricanes are affected equally. On an absolute relative difference basis, the implementation of ice microphysics has a greater effect on the intensity of weaker hurricanes.
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