A size-composition resolved aerosol model for simulating the dynamics of externally mixed particles: SCRAM (v 1.0)

• Main Authors: S. Zhu, K. N. Sartelet, C. Seigneur
• Format: Article
• Language: English
• Published: Copernicus Publications 2015-06-01
• Series: Geoscientific Model Development
• Online Access: http://www.geosci-model-dev.net/8/1595/2015/gmd-8-1595-2015.pdf

The Size-Composition Resolved Aerosol Model (SCRAM) for simulating the dynamics of externally mixed atmospheric particles is presented. This new model classifies aerosols by both composition and size, based on a comprehensive combination of all chemical species and their mass-fraction sections. All three main processes involved in aerosol dynamics (coagulation, condensation/evaporation and nucleation) are included. The model is first validated by comparison with a reference solution and with results of simulations using internally mixed particles. The degree of mixing of particles is investigated in a box model simulation using data representative of air pollution in Greater Paris. The relative influence on the mixing state of the different aerosol processes (condensation/evaporation, coagulation) and of the algorithm used to model condensation/evaporation (bulk equilibrium, dynamic) is studied.