Spiral Rainbands as Seen in Numerical Simulations of Tropical Cyclones

Yumin MoonNCARASP Clouds outside the core of tropical cyclones are often organized into banded structures of convection that spiral radially inward toward the storm center, and these features are often referred to as spiral rainbands. This study examines spiral rainbands in numerical simulations of tropical cyclones, which have become a useful research tool recently. Two types of numerical simulations of tropical cyclones that are popular in recent literature are considered: a realistic numerical simulation of Hurricane Bill (2009) that includes most of the physical processes that occur within real tropical cyclones, and an idealized, no-mean-flow numerical simulation of a tropical cyclone, where only a few essential physical processes are retained. The structures and propagation mechanisms of spiral rainbands will be examined in detail. In addition, why idealized no-mean-flow simulations of tropical cyclones may not be well suited to study spiral rainbands is discussed.Thursday, 29 November 2012, 3:30 PMRefreshments 3:15 PMNCAR-Foothills Laboratory3450 Mitchell LaneBldg 2, Large Auditorium Room 1022

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Thursday, November 29, 2012 - 3:30pm