ufs-dev PR303 #1162
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ufs-dev PR303 #1162
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use_lpt options can be properly used together.
…an66: a) As the current large horizontal momentum diffusivity (Kh) at large-scale and meso-scale (LSMS) looks too large, Kh is computed at zl and modified as Kh=Kq=0.4*elmh*sqrt(tke), elmh=min(1.5*sqrt(zlup*zldn,500), where zlup is parcel's upward travel length and zldn is parcel's downward travel length with tke momentum. b) Scale-aware non-local mass flux (xmf, xmfd) is now given as xmf=(1-sigma)^2 * (sigma*wu) rather than the current xmf=pfnl*c1*wu, where wu is updraft velocity, c1 is a constant, sigma is updraft fraction, and pfnl is partition function for nonlocal flux. The constant c1 is the updraft fraction in LSMS and it should be sigma in small scales as sigma becomes larger than c1 in small scales. Also, the scale-awareness parameter, (1-sigma)^2, is more physically based following Arakawa and Wu's study than the empirical parameter, pfnl. c) Refinement of scl (height of 50% of max tke): max tke can be occasionally found in Jet stream and then scl would be too large. In the update, we look for max tke below 2.5km height and then compute scl and limit to 2.5km (i.e., scl=min(max(scl,500),2500)) d) ri(gradient Richardson number) is computed as ri=bf/shr2 (1dtke) rather than ri=bf/(def_1+def_2), where bf is buoyancy, because the parameters given as a function of ri (such as Prandtl number) is derived based on ri=bf/shr2. e) TTE-EDMF (total turbulent energy based EDMF scheme) is combined into sa3dtke scheme as it shows slightly better GFS forecast skill than tke-based scheme. The logical parameter to conduct TTE-EDMF is 'tte_edmf'.
…o 1000m for the 3DTKE option.
Small change to CMake for MPAS + Initial MPAS interstitial scheme.
hertneky
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dustinswales,
grantfirl and
rhaesung
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grantfirl
approved these changes
Sep 23, 2025
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CI is fixed in the next PR. |
climbfuji
approved these changes
Sep 23, 2025
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climbfuji
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These EDMF changes are beyond my knowledge, but the CCPP updates looks good.
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Description of Changes:
Updates from UFS/dev PR303
Associated ufs/dev PR:
Associated fv3atm PR:
Associated SCM PR: