COMPARING THE SEMI-LAGRANGIAN SPECTRAL AND GRID-POINT VERSIONS OF THE HIRLAM FORECAST MODEL.

摘要

The Nordic countries, the Netherlands, and Ireland have combined in a cooperative research effort to develop, maintain, and improve a fully operational suite of programs for producing accurate short range forecasts (out to 48h). They have adopted the name ' the HIRLAM group' (from High Resolution Limited Area Modelling). As part of that research effort the group have been investigating both spectral and grid-point discretization in space and both Eulerian and semi-Lagrangian discretization in time. In this talk we wish to report on the semi-Lagrangian aspects of this work.