Status of the Next Version GEFS (v13)

Following the development of the UFS coupled model prototypes which were targeting the next version GFS (v17), the latest ensemble prototypes for the next version of GEFS (v13) include the latest updates from the coupled model, especially the atmospheric model physics. As it has been decided to include two-way coupling of aerosol for all the ensemble members in GEFSv13, significant effort has been made to finalize the model configuration as well as to design various experiments to investigate the impact of aerosol coupling. A blending emission scheme has been developed to provide the missing emission information for real time forecasts with aerosol coupling. Prior to the implementation of the GEFSv13, a 30-year reforecast is planned for model calibration and future bias correction. The NOAA Physical Sciences Laboratory (PSL) has completed generation of 30-year GEFSv13 reanalysis data for reforecast using the “replay” approach from existing ERA5 atmospheric reanalysis and ORAS5 ocean reanalysis. This GEFSv13 reanalysis dataset has been tested in our latest ensemble prototypes. In this presentation, we will show the model results from the latest ensemble prototypes. The status of GEFSv13 and associated future plans will also be presented.