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The MAFOR (Multicomponent Aerosol FORmation) model is a Lagrangian type sectional aerosol box model which includes gas phase and aqueous phase chemistry in addition to aerosol dynamics. MAFOR consistently solves the time evolution of the particle number and mass concentration distribution of a multicomponent aerosol using the fixed sectional method and simultaneously the time-dependent concentrations of chemical compounds in the gas phase and also in the aqueous phase of supermicron droplets.


The aerosol model MAFOR is very versatile and meanwhile has been adapted to address various research questions:



  • ultrafine exhaust particles emitted by traffic in cities
  • gas phase chemistry and particle formation in environmental chambers
  • new particle formation over the Arctic Ocean
  • aqueous phase chemistry of amines in fog/cloud



The basic gas phase chemistry and aqueous phase chemistry is based on the recent version of the “Module Efficient Calculating the Chemistry of the Atmosphere (MECCA)” (Sander et al., 2011). The kinetic pre-processor KPP version 2.2.1 (Sandu and Sander, 2006) is used to generate Fortran 90 code for the chemistry module. The Rosenbrock ROS3 solver with automatic time step control is used to integrate the differential equation system of gas phase and aqueous phase reactions. In short, MAFOR is the coupling of the (dynamically generated) chemistry module from MECCA and a new aerosol dynamics module. The treatment of aerosol dynamics is based on the concepts by M. Z. Jacobson described in his book “Fundamentals of Atmospheric Modeling” (Jacobson, 2005). The MAFOR model offers great flexibility to the user who may decide about the included aerosol processes, the included chemistry, the size resolution of the model aerosol and many other parameters of the simulation.


MAFOR version 1.4 was the first version of the model that is distributed as binary executable for Windows and Linux. Version 1.5 fixed a bug for reading tab-delimited input files and improves the calculation of aerosol water content. In version 1.6 the condensation of ammonium as ammonium bisulphate, ammonium sulphate or ammonium nitrate was included. Release of the source code of the model as open source under the GNU General Public License (GPL) is planned for version 2.0. The main intention of distributing the executable of the MAFOR model is the usage for educational purposes. We are looking for interested developers who want to contribute to the further development of MAFOR

Register to download MAFOR version 1.8

MAFOR version 1.8 released - Friday, March 06, 2015
The MAFOR model was renamed "Multicomponent Aerosol Formation" model. New features include the simulation of raw diesel exhaust and a new scheme for dry deposition of particles. The Cygwin executable of version 1.8 was compiled with gfortran 4.9.2. 
BVOC emission dataset available - Friday, April 04, 2014

European plant-specific emission inventory of biogenic volatile organic compounds for use in atmospheric transport models. See more by chosing "BVOC" in the menu.

Implementing size-resolved aerosol in the 3-dim. EMEP model - Sunday, February 03, 2013

The implementation of the MAFOR model in the open source EMEP model will enable the calculation of size-resolved particle number concentration (PNC) and size-resolved particulate matter. See more by chosing "EMEP" in the menu.