Reduction of the condensation/evaporation dynamics for atmospheric aerosols:Theoretical and numerical investigation of hybrid methods

摘要

The dynamical behaviour of atmospheric aerosols is characterized by a wide range of timescales,especially due to the fast growth of small particles through condensation/evaporation.The resulting models are particularly stiff and their numerical simulation still remains a challenge.Some techniques based on the assumption of condensation/evaporation equilibrium are usually advocated in order to circumvent these difficulties.The objective of this article is to investigate the different approaches on a theoretical basis.The appropriate framework is the theory of reduction for slow/fast models,for which many tools are already available.The application to aerosol modelling leads to the so-called hybrid methods.We also propose a hierarchy of reduced models and compare some numerical algorithms in a box model simulation for inorganic species.