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Vortical structures in convective boundary layers and implications for the initiation of deep convection

The purpose of this study is to identify coherent structures in the convective boundary layer, in particular, vertical vortices of scales ranging from dust devil-scale to misocyclones-scale and to compare simulation results to observations. Observations show that dust devils have been reported to be favored in environments characterized by little or no ambient winds (about less than 5 m s -1 ; Webb 1963; Sinclair 1969). Morton (1966) states that wind speeds greater than 7-10 m s -1 will break up a dust devil. In addition, too much wind would modify (Moeng and Sullivan 1994) the cellular convective pattern to which the vertical vortices appear to be integrally tied (Willis and Deardorff 1979; Mason 1989; Kanak et al. 2000, hereafter KLS2000; Kanak 2005). The presence of mean winds or wind shears would provide a more obvious source of vorticity. So a more intriguing question is in such environments mean winds are negligible, from where does the vorticity come? Results are presented from numerical simulations of the convective boundary layer (CBL) without imposed ambient winds that range from dust devilscale O(10 m) up to a “parent cyclone”-scale, which in some cases is on the order of the misocyclone scale O(100) m. The relationship between these vortices, their structure and possible role in CBL processes will be presented.