Aerosol microphysical impact on summertime convective precipitation in the Rocky Mountain region

摘要: We present an aerosol-cloud-precipitation modeling study of convective clouds using the Weather Research and Forecasting model fully coupled with Chemistry (WRF-Chem) version 3.1.1. Comparison output measurements from a research site in Rocky Mountains Colorado revealed that fraction organics is underpredicted. This most likely due to missing processes aerosol module used, such as new particle formation growth secondary organic aerosols. When boundary conditions domain-wide initial loading are changed (factors 0.1, 0.2, 10 mass SO4−2, NH4+, NO3−), precipitation changes by about 5%. Analysis results reveals Mountain region Front Range environment not conducive for invigoration play major role, increasing precipitation, seen some other studies. localized emission increased mimic formation, resulting leads increases opposite what simulations conditions.