CFMIP Committee


CFMIP Publications

CFMIP Mailing Lists

CFMIP Meetings

CFMIP Strategy and Plans

WCRP Grand Challenge on Clouds, Circulation and Climate Sensitivity

CFMIP Data Availability

CFMIP/CMIP6 information

CMIP5 information

CFMIP observational simulator package (COSP)

ISCCP simulator

CFMIP observational datasets (at IPSL)

CFMIP/GCSS Intercomparison of LES and SCMs (CGILS)

CFMIP diagnostic codes


COOKIE Project

The ISCCP simulator is a FORTRAN code that can be used to take cloud and atmosphere information from atmospheric models and convert it into something that is comparable to data from the ISCCP. It was written by Steve Klein ( ) and Mark Webb (

There are various issues you need to be aware of when running the code. Please refer to the advice in the README file.

Version 4.1 of the ISCCP simulator is now available.

A new version if the ISCCP simulator is now available. For use in CMIP5 and CFMIP-2, it is a necessary requirement to upgrade to version 4.1, as the science has changed compared to previous versions. ( Results from version 4.0 may be acceptable as long as they show no signs of corruption. ) This can be done by upgrading from an older version of the ISCCP simulator, or by using the CFMIP Observational Simulator Package (COSP) - see -> CFMIP observational simulator package (COSP). The ISCCP simulator code and README file are available below.