Sensitivity of modeled tropical cyclone track and structure of hurricane Irene (1999) to the convective parameterization scheme |
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Authors: | B E Prater J L Evans |
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Institution: | (1) The Pennsylvania State University, University Park, PA, US |
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Abstract: | Summary The Betts-Miller and the Kain-Fritsch schemes are two of the many approaches to convective parameterization available to
modelers. In the case of hurricane Irene (1999), the choice of parameterization markedly impacted the modeled track and structure
of the hurricane and its subsequent extratropical transition. Specifically, in model runs using Betts-Miller, Irene recurved
too early, causing the storm to weaken over the cool open ocean, delaying its transition, and changing the character of the
storm. The Kain-Fritsch scheme more accurately reproduced the track of Irene and, hence, its interaction with upper-level
features that caused extratropical transition and post-transition intensification. The two parameterizations produce different
characteristic vertical warming profiles; the differences in warming are related to the structural differences in the simulated
storm, affecting the hurricane response to its environment.
Received October 13, 2001 Revised December 23, 2001 |
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