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Changes in the FV3 dycore to support 3DTKE EDMF PBL physic scheme #382
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laurenchilutti
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NOAA-GFDL:dev/emc
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hafs-community:feature/3dtke_gfspbl
Jun 30, 2025
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7bdc2c6
3D-TKE EMDF GFS PBL scheme related changes from FIU (Ping Zhu, Ping.Z…
BinLiu-NOAA c50e339
Update submodules fv3/atmos_cubed_sphere for 3dtke data structure
bd0e414
Update based on stylistic comments and mpi use in dyn_core
219f701
Merge remote-tracking branch 'remotes/upstream/dev/emc' into feature/…
BinLiu-NOAA ec21a2a
Change dku3d_h to be an optional input variable for d_sw subroutine. …
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This logic is copying the dku3d_h and dku3d_e from the physics state (IPD_tbd) into the dynamics memory space (Atm) after the dycore has run, but before the atmospheric physics are computed. Is this seeming lagging of data for dku3d*_ the intended behavior? If so, please add some comments explaining why this logic is the way it is here.
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Thanks for the comments! This is a great question. dku3d_h and dku3d_e are the horizontal eddy diffusivities for momentum and scalars, which are used for calculating damping coefficient and horizontal TKE transport in the dycore. dku3d_h and dku3d_e are the functions of TKE that this determined by the TKE budget equation in the atmospheric physics. So, here is the thing. If they are put before the atmospheric physics, it means that dku3d_h and dku3d_e determined by the previous timestep TKE is used for calculating TKE transport that feeds into the atmospheric physics for updating the next timestep TKE. The updated TKE is then used for updating dku3d_h and dku3d_e for the next timestep. If they are put after the dku3d_h and dku3d_e, the TKE is updated but dku3d_h and dku3d_e are still the ones determined by the last timestep TKE since they are caclulated before TKE updating. So, the difference would be negligible. Of course, we may transfer dku3d_h and dku3d_e after the atmospheric phyics. But we don't know how to do this in the dycore.