A multi-scale chemistry-transport model for atmospheric composition analysis and forecast Current version: CHIMERE v2023r3(Released March 2025) 
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| Reference papers |
- Menut, L., Cholakian, A., Pennel, R., Siour, G., Mailler, S., Valari, M., Lugon, L., and Meurdesoif, Y.: The CHIMERE chemistry-transport model v2023r1, Geosci. Model Dev., 17, 5431–5457, 2024.
- 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... |
- Tutorial for GITLAB: How to contribute to the model development?
- For a complete description of the model, download the CHIMERE Documentation .
- A detailed list of known issues found (will be updated on a regular basis).
- A list of FAQ (will be updated on a regular basis).
- List of publications using CHIMERE
| Download the model |
Other open-source programs: |
| About this web site |
| What's new? |
- [2025/03]: Release of CHIMEREv2023r3 and emiSURFv2023r2
- [2024/07]: Release of CHIMEREv2023r2
- [2024/03]: The "open positions" page
- [2023/12]: Release of CHIMEREv2023r1, emisurfv2023r1 and emifiresCAMS2023
- [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 |
- New file format and databases for anthropogenic and fires emissions
- Addition of the XIOS library for output management
- Modularization of subroutines
- Possibility to output AOD per aerosols
- New version in Fortran 90 of the Isorropia reverse model.
- New calculation for the turbulence and dry deposition
- New transport schemes
- Implementation of pollen emission
- Parameterization of the impact of fires on mineral dust emissions and Leaf Area Index.
| Recent results |
- Menut, L., Bessagnet, B., Cholakian, A., Siour, G., Mailler, S., and Pennel, R.: What is the relative impact of nudging and online coupling on meteorological variables, pollutant concentrations and aerosol optical properties?, Geosci. Model Dev., 17, 3645–3665, 2024.
- Menut, L., Cholakian, A., Siour, G., Lapere, R., Pennel, R., Mailler, S., & Bessagnet, B. (2023). Impact of Landes forest fires on air quality in France during the 2022 summer. Atmospheric Chemistry and Physics, 23(13), 7281-7296.
- Mailler, S., Pennel, R., Menut, L., & Cholakian, A. (2023). 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. Geoscientific Model Development Discussions, 2023, 1-26.
| Where is the model used? |
