The Relative Impact of Aerosols and Environmental Moisture on the Characteristics of Low-Precipitation Supercells
High-resolution, idealized, cloud-resolving modeling simulations have been performed with the Regional Atmospheric Modeling System in order to achieve this goal. Supercell storms were simulated under a range of aerosol concentrations and environmental moisture profiles. A classic supercell was first simulated using a moist profile and clean aerosol conditions. Sensitivity tests then demonstrate that LP supercells can form under clean or polluted conditions when elevated dry layers are present, such as may be seen near the dryline or within environmental conditions unmodified by previous convection. Mechanisms that distinguish between LP and classic supercells will be presented, including the relative roles played by enhanced aerosol concentrations and dry layers. More specifically, the relative influence of aerosols vs. environmental moisture on supercell storm dynamical and microphysical characteristics, including updraft and vorticity structure, hail formation mechanisms, and precipitation distribution, will be discussed.