Uitleg uit het bericht van Rogier gisteravond
Bericht van: Koos Spakman (Froombosch) , 13-11-2024 09:53In IFS Cycle 49r1, HRES and the ENS control forecast become scientifically and computationally identical and both are run for 15-days at 00 UTC and 12 UTC, and 6 days at 06 UTC and 18 UTC. The superfluous ENS control forecast will be stopped in a future IFS upgrade, and the data stream currently known as HRES will become known as the “control” forecast.
From IFS Cycle 49r1 the wave model will be run on the same octahedral reduced gaussian grid as the atmospheric model, simplifying the data exchange between the two systems. Consequently the resolution of the wave model will increase to ~9km (O1280) in the medium range and ~36 km (O320) in the sub-seasonal range. With higher resolution, the wave model is better able to capture the atmospheric forcing, and details of the coastal conditions are generally better represented. The wave model will also run for 15-days at 00 UTC and 12 UTC, and for 6 days at 06 UTC and 18 UTC.
The wave spectrum continues to be discretised with 36 frequencies and 36 directions. However, to reduce the data volume, please note that in Cycle 49r1 only the first 29 frequencies will be output spanning a range from ~0.035 Hz to ~0.5 Hz.
