Dynamics of aerosol removal from the atmosphere based on dose rate change.

In this study, the dynamics of scavenging of radioactive aerosol particles by dry and wet deposition were calculated. To obtain scavenging coefficients for rain, humidity and temperature change and aerosols residence time based on dose rate, monitoring results have been applied. Fluctuations in dose rate were analyzed in relation to meteorological parameters, and evaluated separately for each season based on a database with results from 10 years. The analysis was conducted using data from two urban locations in Poland: Lodz and Warsaw. Multiple regression analysis was applied to calculate individual scavenging coefficients λ [s⁻¹] for precipitation, humidity and temperature for each month. The proposed method provides a detailed evaluation of the complex relationships between meteorological factors and aerosol removal, offering insights into the variability of aerosol residence times under different weather conditions. Scavenging coefficients were independent from the seasons, but aerosol residence time displayed typical seasonal trend and changed from 3 to 29 days.