The Chimere chemistry-transport model
A multi-scale model for air quality forecasting and simulation.
  [2016/07] Open registration for the 12th CHIMERE Training Course: September, 14-16, 2016
  [2015/05] Open registration for the 11th CHIMERE Training Course: September, 23-25, 2015
  [2014/09] Patch for a bug fix in 2014b: compilation error of prep_mie.F90 with some compilers
  [2014/09] Release of CHIMERE version 2014b
This server is designed to provide source codes of the model, data from long-term simulations, and experimental forecasts made at IPSL. All data provided on this server should be used in a professional context.
The CHIMERE model is provided under the GNU General Public License (since 2000)
Copyright (C) Institut Pierre-Simon Laplace, Ecole Polytechnique, INERIS, CNRS.
  • This server is located at the Ecole Polytechnique
  • Site Editors: Dmitry KHVOROSTYANOV and Laurent MENUT.
  • What's new in the latest release?

    The current CHIMERE version is chimere2014b.
    This is mainly bug a fix release but also includes computation speed optimization of the Boundary Conditions pre-processor. Due to important bug fixes in chimere2014a all the users are strongly encouraged to upgrade to chimere2014b.

    New in chimere2014:

    • Processes
      • Added the FastJ radiative transfer model to compute photolysis reaction rates. This makes it possible to extend the model domain vertically beyond 500 hPa. An automatic calculation of optical depth (for clouds and aerosols) is also done.
      • Added possible read of fires emissions fluxes (if provided by the user)
      • Added SAPRC-07-A chemical mechanism
      • Updated ISOROPIA V2006
    • Numerics/Software
      • Activated adaptive CFL condition. This speeds up computations.
      • Improved deep convection calculation. This speeds up computations and yields more realistic ozone land-sea interfaces.
      • Diagnostics of meteorological parameters, mineral dust and biogenic emissions are calculated on-line in the model core.
      • Improved calculations of boundary conditions (with new datasets built with LMDz-INCA, GOCART and MACC global climatologies)
      • Optimized calculations of vertical levels
    For more detail see the CHIMERE Documentation (in PDF).


  • Who and where for the development (developers and main contributors)
  • Contact the developers:
  • Register on the users mailing list

    Other informations

  • Web sites for forecasts, including the operational system.
  • Previous model versions documentations

    Short model description

    The CHIMERE multi-scale model is primarily designed to produce daily forecasts of ozone, aerosols and other pollutants and make long-term simulations (entire seasons or years) for emission control scenarios. CHIMERE runs over a range of spatial scale from the regional scale (several thousand kilometers) to the urban scale (100-200 Km) with resolutions from 1-2 Km to 100 Km. On this server, documentation and source codes are proposed for the complete multi-scale model. CHIMERE proposes many different options for simulations which make it also a powerful research tool for testing parameterizations, hypotheses. CHIMERE is a parallel model that has been tested on machines ranging from desktop PCs running the GNU/Linux operating system, to massively parallel supercomputers (HPCD at ECMWF).

  • NO2 Surface concentrations at high horizontal resolution (2.5km) (Fig. A.Colette, INERIS)

    Maps of the CHIMERE users (2015)