大気汚染物質が都市域豪雨の雲微物理過程に及ぼす影響に関する数値実験とその検証

Abstract

This study found that air pollutants contribute to the intensification and acidification of urban heavy rainfall (UHR) in the calculations using a meteorological and chemical transport model, NHM-Chem with chem-to-met feedback processes, under the uncertainties from cloud microphysical and chemical modules. Considering chemical properties in aerosol-cloud interaction (ACI) process enhanced cloud droplet transport to higher altitudes, promoting graupel growth. The resulting maximum 1-hour precipitation was enhanced nonlinearly. The contribution of local anthropogenic air pollutants to wet deposition in UHR was estimated to be 40-80%. The wet deposition of acidic substances was 2.54 times higher in UHR than in normal precipitation.