Effects of Cumulus Convection on the vorticity Field in the Tropics

[摘要] The large-scale budget of vorticity over the Marshall Islands area is re-examined based on wind data during the period April-July 1956. Efforts are made to obtain accurate estimates of the horizontal advection and twisting terms in the vorticity equation. The mean vertical profile of the budget residual for disturbed conditions shows a large apparent source of positive vorticity in the upper troposphere and a sink near the surface. However, this mean profile is more complicated than those previously obtained for this area. The mean vorticity budget for undisturbed cases is characterized by a large local time change which is nearly com-pensated by the horizontal advection of absolute vorticity.

[学科分类] 大气科学