Abstract
Abstract A set of 13 two-dimensional numerical simulations based on the 22 and 23 June Soundings from the ConvectionProfonde Tropicale in 1981 (COPT81) experiment in West Africa is used to study the organization and interactionof the convective and stratiform regions of squall-line-type convective systems. The initial wind profiles arecharacterized by the African easterly jet (AEJ) and the tropical easterly jet (TEJ) located at about 3.5 km and14 km, respectively. The physical processes that generate and maintain the mesoscale inflow at the rear of squall-line-type mesoscaleconvective systems are thereby examined. Horizontal potential temperature gradients generated by a combinationof latent heat release in the convective region and unsaturated mesoscale descent, both modulated by evaporation,cause a horizontal pressure gradient and generate horizontal, line-parallel vorticity. The rear inflow is a consequenceof these processes. The convective activity induces a significant upscale influence; ahead of the...
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