New Capabilities in FV3GFS Write Grid Component

GFDL finite volume cubed-sphere dynamical core (FV3) was selected as the dynamics core of the Next Generation Global Prediction System (NGGPS). The GFDL NGGPS FV3 forecast system with GFS physics package was integrated into the NOAA environmental modeling system (NEMS) infrastructure and the forecast system FV3GFS for global application (GFSv15) was implemented into operation in June 2019. The new system was built as a foundation of the Unified Forecast System (UFS).

Since the implementation of GFSv15, further development has been conducted in model infrastructure. In FV3GFS, the write grid component was developed to have asynchronous IO so that forecast can advance without IO bottleneck. In this presentation, new capabilities added into the FV3GFS write grid component will be presented. Besides outputting model history file on native cubed sphere grid for global application, the write grid component can now output history files on various grids for global, regional and nested applications. Due to the resolution increase for next GFS implementation, in-line POST processing capability is added so that model can output post processed products directly along with model forecast. This new capability provides an option to output POST products with equivalent resolution to model native grid but with significantly reduced size. The methodology and these new features and their impact on model performance will be presented.