ADCHAM model description

The kinetic multilayer model for Aerosol Dynamics, gas and particle phase chemistry in laboratory CHAMber environments (ADCHAM)[1] is a model primarily intended to be used for detailed studies of laboratory chamber experiments.

It includes: (i) all basic aerosol dynamic processes (nucleation, coagulation, condensation and dry deposition), (ii) a detailed particle phase chemistry module based on AIOMFAC2, which can simulate acid catalysed oligomerization and non-ideal mixing and interactions between organic and inorganic compounds, (iii) a kinetic multilayer module which treats the mass transfer limited diffusion of compounds in the particle phase, and (iv) simulates the gas-phase chemistry with the near explicit Master Chemical Mechanism (MCMv3.2) from the University of Leeds ( With this comprehensive model the SOA formation, evaporation and chemical transformation can be modelled from first principles. Figure 1 illustrates the ADCHAM model structure.

ADCHAM model applications (examples)

ADCHAM have been used to simulate (i) the mass transfer limited uptake of NH3 and formation of organic salts between ammonium and carboxylic acids, (ii) the slow and almost particle size-independent evaporation of α-pinene SOA particles, (ii) the influence of heterogeneous reactions on the SOA formation and properties, and (iv) to study the influence of chamber wall effects on the SOA mass formation, particle number size distribution and gas phase chemistry[1,3].

References (Publications from our group are highlighted with bold)