The Impacts of Elevated Aerosol Layers on the Dynamics and Microphysical Characteristics of Deep Convective Storms
This goal has been achieved through the use of high-resolution, idealized numerical simulations of convection conducted using the Regional Atmospheric Modeling System (RAMS). Convection was initiated through the use of a warm, thermal perturbation, and a relatively clean, homogeneous aerosol background was utilized in the control simulation. A number of sensitivity tests were then conducted in which the location and concentrations of aerosols were varied, including (1) a linearly decreasing profile of aerosol concentrations starting with 400/cc at the surface; and (2) three simulations in which enhanced aerosol concentrations were located from 0-2km, 2-5km and 5-8km. The aerosol number concentration was varied within each of these three layers in order to ensure that the optical depth was the same as that in the linearly decreasing case. The aerosol within the simulations may serve as cloud condensation nuclei and/or ice nuclei based on the prognosed environmental conditions, and fully interacts with the radiation scheme. The impacts of such elevated layers on the development, characteristics and surface precipitation of the evolving deep convection has been analyzed through the use of microphysical process budgets, aerosol tracking and trajectory analysis, and will be presented.