P2.99 Convectively coupled gravity waves in the tropics: Why do most waves travel westward?

Thursday, 13 May 2010
Arizona Ballroom 7 (JW MArriott Starr Pass Resort)
Stefan N. Tulich, CIRES/Univ. of Colorado, Boulder, CO; and G. N. Kiladis

Observations are presented showing evidence of a strong, two-way coupling between tropical convection and zonally-propagating inertia-gravity wave disturbances with periods < 2 days and zonal scales < 1000 km. Many of these mesoscale wave disturbances can be classified as tropical squall line systems, including the fast-moving squall lines observed during GATE. To address the question of why westward-moving waves are preferred over eastward-moving, we describe results from explicit three-dimensional simulations of convection on an equatorial beta-plane.
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