HR4 and SFS baseline update: Improve convection/radiation interaction in the GFS physics suite #851
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14 tasks
|
Please specify the ccpp-physics PR that this PR depends on. |
done |
DusanJovic-NOAA
approved these changes
Jul 18, 2024
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@BrianCurtis-NOAA are you able to review this PR? The sub-component ccpp-physics PR and been merged. |
BrianCurtis-NOAA
approved these changes
Jul 19, 2024
|
@jkbk2004 can you merge this PR, please? |
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Description
The GFS physics suite at 100km yields too large cloud cover and optical depth, causing too much cloud shielding and a drift in Sea Surface Temperatures, SST for seasonal prediction. This is an issue for the Seasonal Forecast System baseline. The issue was identified to be related to too much convective cloud condensate passed in from the cumulus convection scheme.
A scale adaptive solution is proposed and tested for SFS and GFS resolutions, outputting updraft values of in-cloud condensate. We propose to add this change to SFS baselines as well as the HR4 prototype of the GFS. In testing we also tune the minimum background diffusivity in the inversion layer near the PBL top (xkinv1) from xkinv1=0.4 to xkinv1=0.15 in order to not reduce convective clouds too much in marine stratocumulus.
Issue(s) addressed
fixes Improve convection/radiation interaction in the GFS physics suite to address a drift in SST for seasonal prediction ufs-community/ufs-weather-model#2339
uses HR4 and SFS baseline update: Improve convection/radiation interaction in the GFS physics suite ufs-community/ccpp-physics#216