NOAA/NWS selected the Geophysical Fluid Dynamics Laboratory (GFDL) finite volume cubed-sphere (FV3) dynamical core as the NWS Next Generation Global Prediction System (NGGPS). The current operational GFS, which has a spectral dynamical core, will be replaced by the proposed GFS with FV3 dynamical core and improved physics parameterizations in the second quarter of 2019.
The proposed GFS version maintains a horizontal resolution of 13 km and has 64 levels in the vertical extending up to 0.2 mb. It uses the same physics package as the current operational GFS except for:
-Replacing Zhao-Carr microphysics with the more advanced GFDL microphysics
-Updating parameterization of ozone photochemistry with additional production and loss terms
-Introducing parameterization of middle atmospheric water vapor photochemistry
-Revising bare soil evaporation scheme
The data assimilation system will be updated to include:
- Infrared Atmospheric Sounding Interferometer (IASI) moisture channels
- Advanced Technology Microwave Sounder (ATMS) all-sky radiances
- Fix for an issue with the Near Sea Surface Temperature (NSST) in the Florida Strait
- Upgrade to the use of Cross-track Infrared Sounder (CrIS) radiances
- NOAA-20 CrIS and ATMS data
- Megha-Tropiques SAPHIR data
- Advanced Scatterometer (ASCAT) data from MetOp-B
Most pilots are weatherwise, but some are otherwise™
Scott Dennstaedt
Weather Systems Engineer
CFI & former NWS meteorologist
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