Description of the upgrade

A set of three important modifications to the model's physics was implemented in the operational forecasting system:
  1. A new parametrisation scheme for radiative fluxes and the representation of cloud optical. properties.
  2. A reformulation of cumulus parametrisation using the mass flux approach.
  3. A revision of the gravity wave drag formulation.

Implemented: 02 May 1989  


ECMWF Newsletter: An article from the ECMWF Newsletter describing these changes is given in pdf (184 KB) file.