Consideration of aerosol injection processes originating from wildfires in a chemical transport model

Several reports have indicated that fire plumes reach the free troposphere owing to large forest fires. Aerosols injected at high altitudes have a significant impact on atmospheric chemistry and climate. However, the effect of explosive convection on atmospheric aerosol transport has not been adequately quantified. Chemical transport models are effective tools for reproducing the behavior of atmospheric aerosol transportation. Aerosol emissions originating from wildfires were estimated based on the amount burned per unit area, burned area, combustion efficiency, and emission factors. Forest fires were detected based on abnormally high temperature data from satellite observations. Numerical model simulations were performed using emission inventory data. Aerosols are typically generated near the ground surface; however, aerosols from wildfires may be emitted at high altitudes because of the lift force from combustion. The results suggest that incorporating accurate injection altitudes in chemical transport models can improve the precision of air quality forecasts and contribute to more reliable climate models, particularly in regions affected by frequent wildfires. In this study, the chemical transport model used meteorological fields simulated by Scalable Computing for Advanced Library and the Environment Regional Model for offline calculations. The simulated results were validated using ground measurements and biomass-burning aerosol distributions derived from a second-generation global imager The results of this study show that the injection process in the model simulation has a significant impact on aerosol distribution.