Development and verification of long‐range atmospheric transport model of radon‐222 and lead‐210 including scavenging process

A three‐dimensional Eulerian atmospheric long‐range transport model of radon‐222 (222Rn) and lead‐210 (210Pb) coupled with meteorological model MM5 was developed. The model calculates advection, diffusion, radiation decay and deposition processes in a horizontal scale of several thousand kilometers. This model was applied to East Asia. Performance of the model was evaluated with measured hourly surface air 222Rn concentration and monthly 210Pb deposition. The model verification was done with respect to the following points: 1) the sensitivity of vertical distribution of turbulent diffusivity and 2) the accuracy of spatial distribution of precipitation. In this report, improvement of the model performance is also discussed.