Renovation of JMA-GSM

JMA-GSM is the global atmospheric model for official weather forecasting in Japan. The model was renovated at 5 August, 2008. Although the principles were not changed from the conventional model, the implementation was renovated: reduced spectral transformation was introduced; the calculation domain was two-dimensionally decomposed; the procedures of inter-node communication were refined; OpenMP was adopted for shared memory parallelization; some defectives were corrected; the source program was reorganized.

In this presentation, we will introduce the details of the renovation and show how the renovation makes the model faster and improves the accuracy.