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Keywords:

  • Semi-Lagrangian scheme;
  • Spectral model;
  • Two-time-level scheme

Abstract

A three-time-level semi-Lagrangian global spectral model was introduced operationally at the European Centre for Medium-Range Weather Forecasts in 1991. This paper first documents some later refinements to the three-time-level scheme, and then describes its conversion to a two-time-level scheme. Experimental results are presented to show that the two-time-level scheme maintains the accuracy of its three-time-level predecessor, while being considerably more computationally efficient.