SUMMARY OF GENESIS WORK AT THE EUROPEAN CENTER FOR MEDIUM-RANGE WEATHER FORECASTS (ECMWF)

Benchmarks with simplified atmospheric models on small parallel computers, and performance estimates with operational weather models on massively parallel computers, indicate that atmospheric models can be efficiently implemented on future parallel supercomputers with thousands of processors. By using the so-called transposition strategy, which employs a time-varying domain decomposition, current sequential numerical methods, and even most subroutines, can be employed in the parallel models without any modifications.