A new algorithm to solve condensation/evaporation for ultra fine, fine, and coarse particles

A new algorithm for condensation/evaporation has been developed that is accurate for both mass and number concentrations over the full size range of ultra fine, fine, and coarse particles. This new algorithm is compared to several standard sectional and modal algorithms for two case studies. In this algorithm, we use the Euler scheme for the number concentration of ultra fine particles and the Euler scheme for the mass concentration of fine and coarse particles. The results of this study provide useful information to select algorithms in order to correctly simulate aerosol dynamics in air quality models over a wide range of particle sizes.