This page describes how to access and use the offline version of ECMWF's radiation scheme "ecRad", which is operational in the ECMWF Integrated Forecasting System from Cycle 43R3. It is around 40% faster than the "McRad" scheme used in earlier cycles, and its modular design allows the spectral resolution, the description of cloud and aerosol optical properties, and the solver, to be changed independently of one another. Its offline version is well suited for use as a research tool.

ecRad is written in Fortran 2003 and has been tested using the GNU, PGI and Cray compilers on Linux systems. A prerequisite is the NetCDF library.

From version 1.4.0, ecRad is released under the conditions of the open source Apache License, version 2.0.


Obtaining ecRad

Earlier versions of ecRad were distributed under the terms and conditions of the OpenIFS licence, which is the same license as used for the full OpenIFS model.  These more restrictive licenses are still valid for those who have them. Please note that the open source Apache License only applies to ecRad version 1.4.0 and later, which has had an appropriate copyright and license statement added to each source file.

Aerosol optical property files

Other resources

Space contributors