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NOAA-EMC / global-workflow

Global Superstructure/Workflow supporting the Global Forecast System (GFS)
https://global-workflow.readthedocs.io/en/latest
GNU Lesser General Public License v3.0
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Update damping and time-step options to atmos to support GFSv17 and GEFSv13 #2574

Closed yangfanglin closed 4 months ago

yangfanglin commented 5 months ago

What new functionality do you need?

Apply new damping and time-step options to all supported atmos resolutions and to both GFS and GEFS. Apply the same damping to both GFS and GDAS cycles. Stronger damping was applied to GDAS in GFSv16. This new damping option includes both explicit Rayleigh damping aaplied to u and v and implicit damping applied to w. See this document for the options.
This update makes the model more stable, allows longer time-step to be used for certain resolutions, and unify the damping options applied to GFS and GDAS cycles.

What are the requirements for the new functionality?

Only requires workflow updates made to parm/config/gefs/config.fcst parm/config/gefs/config.ufs parm/config/gfs/config.fcst parm/config/gfs/config.ufs. No corresponding changes to ufs-weather-model are required.

Acceptance Criteria

pass workflow CI test

Suggest a solution (optional)

No response

yangfanglin commented 5 months ago

A workflow branch has been created https://github.com/yangfanglin/global-workflow/tree/dycore_update_hr4 . Results from a test at the C1152 resolution (coupled model) can be found at https://www.emc.ncep.noaa.gov/gmb/wx24fy/C1152/newdamp/