A multi-scale chemistry-transport model
for atmospheric composition
analysis and forecast

Current version: CHIMERE v2023r1

(Released December 2023)

Reference papers    

  • Menut L., B. Bessagnet, R.Briant, A.Cholakian, F.Couvidat, S.Mailler, R.Pennel, G.Siour, P.Tuccella, S.Turquety, and M.Valari, The CHIMERE v2020r1 online chemistry-transport model, Geoscientific Model Development, 14, 6781-6811, 2021, .
  • Mailler S. et al., CHIMERE-2017: from urban to hemispheric chemistry-transport modeling , Geosci. Model Dev., 10, 2397-2423, https://doi.org/10.5194/gmd-10-2397-2017, , 2017

Documentation, scripts, publications...

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In order to know about or contact the developers.
Other open-source programs:
  • Fires: pre-processor for CAMS biomass burning emissions.
  • Explume: a model for personal exposure to ambient O3 and PM2.5

    About this web site
The CHIMERE model is provided under the GNU General Public License (since 2000). This server is located at the Ecole Polytechnique and the CHIMERE website is maintened by Laurent MENUT. Copyright (C) Institut Pierre-Simon Laplace, Ecole Polytechnique, CNRS.

    What's new?
  • [2024/03]: The "open positions" page
  • [2024/02]: Registration for the training course is now open: Register here
  • [2023/12]: Release of CHIMEREv2023r1, emisurfv2023r1 and emifiresCAMS2023
  • [2023/06]: CHIMERE Workshop in Paris on June 22 and 23, 2023
  • [2022/09]: Wikipedia CHIMERE web pages [FR], [ENG], [FA]
    What is CHIMERE?
  • CHIMERE is an open source multi-scale chemistry-transport model designed to produce (i) accurate analysis of pollution episodes, (ii) daily forecasts of ozone, aerosols and other pollutants, (iii) long-term simulations (entire seasons or years) for emission control scenarios. It runs over a range of spatial scale, from the hemispheric to the urban scale with resolutions from 1km to several degrees. It has many different options for simulations which make it also a powerful research tool for testing parameterizations. CHIMERE is a parallelized model that has been tested on machines ranging from desktop PCs running the GNU/Linux operating system, to massively parallel supercomputers (HPCD at ECMWF).
  • On this server, documentation and source codes are free to access. The model is proposed with a complete environment: global model climatologies for boundary conditions, programs for emissions (anthropogenic with emisurf, biomass burning).
  • To learn how to use and modify the model, training sessions are organized once a year (see pictures from previous training sessions)

    New functionalities    

  1. New file format and databases for anthropogenic and fires emissions
  2. Addition of the XIOS library for output management
  3. Modularization of subroutines
  4. Possibility to output AOD per aerosols
  5. New version in Fortran 90 of the Isorropia reverse model.
  6. New calculation for the turbulence and dry deposition
  7. New transport schemes
  8. Implementation of pollen emission
  9. Parameterization of the impact of fires on mineral dust emissions and Leaf Area Index.

    Recent results    

  • Mailler S., R.Pennel, L.Menut, and A.Cholakian, An improved version of the Piecewise Parabolic Method advection scheme: description and performance assessment in a bidimensional testcase with stiff chemistry in toyCTM v1.0., Geosci. Model Dev. Discuss. [preprint], , accepted, 2023.

  • Menut, L., Cholakian, A., Siour, G., Lapere, R., Pennel, R., Mailler, S., and Bessagnet, B.: Impact of Landes forest fires on air quality in France during the summer 2022, Atmos. Chem. Phys., 23, 7281-7296, 2023, .

  • Cholakian, A.; Bessagnet, B.; Menut, L.; Pennel, R.; Mailler, S. Anthropogenic Emission Scenarios over Europe with the WRF-CHIMERE-v2020 Models: Impact of Duration and Intensity of Reductions on Surface Concentrations during the Winter of 2015. Atmosphere 2023, 14, 224,

    Where is the model used?
Click on the map to see the users