The ECMWF global atmospheric model

• The model equations
• The numerical formulation
• Climatological and geographical fields
• The formulation of physical processes
• The ocean wave model
• Plans for the future

The ECMWF general circulation model, TL799L91, consists of a dynamical component, a physical component and a coupled ocean wave component. The model formulation can be summarised by six basic physical equations, the way the numerical computations are carried out and the resolution in time and space.