News:

• [2019/07] 2019 CHIMERE training course
• [2019/03] CHIMERE use survey results
• [2018/07] Biomass burning programs are now available in the section [Fires]
• [2018/07] Update for the libraries to use with CHIMERE .
• [2018/07] 14th CHIMERE training course
• [2018/02] The OPTSIM code, numerical tool for gas and particles radiative properties modeling, in free access.
• [2017/07] Publication of the [Mailler et al., 2017] GMD paper about the 2017 version.
• [2017/07] Update of the 'articles' page
• [2017/03] Release of the 2017 version
• [2016/04] Article [Briant et al., 2017] about the on-line development.

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).

What's new in the chimere2017 release?
Processes

• New parameterizations for sea salt emissions.
• Optimization of AOD calculation for mineral dust
• Evaporation of secondary inorganic aerosols takes into account the gas/particle partitioning.
• Adjustment of some constants in model parameterizations (cut-off relative humidity for aerosol processes, deep convection activation threshold).
• In case of identical horizontal domain to that of WRF is taken into account, direct use of its surface pressure.

• Separation of biogenic and sea salt emissions processing. The resulting emissions are saved respectively in BEMISSIONS.nc and SEMISSIONS.nc files.
• Changed order of (optional) arguments to chimere.sh; possibility to specify simulation end hour.
• New soil categories processing with a high-resolution database for the GREENFRAC variable
• Taking into account metal oxydes in reactions of SO2 with Fe and Mn
• Several bug fixes

The model code: sources, documentation, publications

• The CHIMERE Documentation .
• How to download the model source code
• To learn how to use and modify the model, training sessions are organized twice a year
• The Frequently Asked Questions page
• A detailed list of updates and bugs found in the previous version
• List of useful scripts for pre or post-processing
• List of publications using CHIMERE
• A wysiwyg Linux tool to easy plot the results of a simulation: CHIMPLOT

Contacts

Web sites for forecasts, including the operational system.

About this website:
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). This server is located at the Ecole Polytechnique and maintened by Laurent MENUT. Copyright (C) Institut Pierre-Simon Laplace, Ecole Polytechnique, INERIS, CNRS.