A numerical tool for gas and particles radiative properties modeling

Developed by the team

OPTSIM is now in free access, registration form is removed.

For questions, please send an e-mail to optsim@lmd.polytechnique.fr

What is OPTSIM?
OPTSIM is a numerical tool dedicated to calculate optical properties in the troposphere from modelled aerosols concentrations fields.

  • Aerosol Optical Thickness estimation for several wavelengths (all aerosols types)
  • Homogeneous or core-shell mixing for refractive index and optical properties calculations
  • Lidar backscattered signal simulation for direct comparisons with CALIOP and PARASOL satellite level 1 data.
  • OPTSIM is written in Fortran 90 and uses NetCDF model files as inputs
  • Example of lidar simulator use, [Stromatas et al., 2012]
    Source code and documentation
    • The documentation in PDF: optsim-guide.pdf
    • A new version, OPTSIM v2, is currently under preparation and validation and will be distributed in next October 2020.
    Peer reviewed literature
    1. Stromatas S., S. Turquety, L. Menut, H. Chepfer, G. Cesana, J.-C. Pere, and B. Bessagnet Lidar Signal Simulation for the Evaluation of Aerosols in Chemistry-Transport Models, Geoscientific Model Development, 5, 1543-1564,

    2. Vuolo M.R., H.Chepfer, L.Menut and G.Cesana, 2009, Comparison of mineral dust layers vertical structures modelled with CHIMERE-DUST and observed with the CALIOP lidar, Journal of Geophysical Research - Atmospheres , Vol. 114, D09214, doi:10.1029/2008JD011219,

    The OPTSIM code is provided under the GNU General Public License (since 2012)
    Copyright (C) Institut Pierre-Simon Laplace, C.N.R.S.
    This server is located at the Ecole Polytechnique, Site Editor: Laurent MENUT