WRF Physics Options
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Transcript of WRF Physics Options
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WRF Physics OptionsJimy Dudhia
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diff_opt=12nd order diffusion on model levelsConstant coefficients (khdif and kvdif)km_opt ignored
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diff_opt=22nd order horizontal diffusionAllows for terrain-following coordinateUses km_opt 1: constant (khdif and kvdif used) 2: 1.5-order TKE prediction 3: Smagorinsky (deformation/stability
based K)
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damp_opt=1Upper level damping layerEnhanced horizontal and vertical diffusion at topCosine function of heightUses additional parameters zdamp: depth of damping layer dampcoef: nondimensional maximum
magnitude of damping
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mp_physics=1Kessler schemeWarm rain – no iceIdealized microphysics
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mp_physics=2Purdue Lin et al. scheme5-class microphysics including graupel1.2 includes ice sedimentation
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mp_physics=3NCEP 3-class schemeFrom RSM scheme (Hong)3-class microphysics with iceIce processes below 0 deg C1.2 includes ice sedimentation
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mp_physics=4NCEP 5-class schemeAlso from RSM scheme (Hong)5-class microphysics with iceSupercooled water and snow melt1.2 includes ice sedimentation
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mp_physics=5Ferrier (new Eta) schemeOne prognostic total condensate variableDiagnostic ice and water species and liquid fractions
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mp_physics=99Zhao-Carr (old Eta) schemeCloud/ice predictionDiagnostic precipitation evaporation
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ra_lw_physics=1RRTM scheme from MM5Spectral schemeK-distributionLook-up table fit to accurate calculationsInteracts with cloudsOzone from climatology
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ra_lw_physics=99GFDL longwave scheme used in EtaSpectral scheme from global modelAlso uses tablesInteracts with cloudsOzone from climatology
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ra_sw_physics=1MM5 shortwave (Dudhia)Simple downward calculationClear-sky scatteringWater vapor absorptionCloud albedo and absorption
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ra_sw_physics=2Goddard shortwaveSpectral methodInteracts with cloudsOzone effects
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ra_sw_physics=99GFDL shortwaveUsed in Eta modelOzone effectsInteracts with clouds
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bl_sfclay_physics=1Monin-Obukhov similarity theoryTaken from standard relations used in MM5 MRF PBLProvides exchange coefficients to surface (land) schemeShould be used with bl_pbl_physics=1
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bl_sfclay_physics=2Monin-Obukhov similarity theoryModifications due to JanjicTaken from standard relations used in Eta model, including Zilitinkevich thermal roughness lengthShould be used with bl_pbl_physics=2
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bl_surface_physics=15-layer thermal diffusion model from MM5Predict ground temp and soil tempsThermal properties depend on land useNo effect for waterProvides heat and moisture fluxes for PBL
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bl_surface_physics=2OSU/MM5 Land Surface ModelVegetation effects includedPredicts soil temperature and soil moisture in four layersPredicts snow cover and canopy moistureDiagnoses skin tempProvides heat and moisture fluxes for PBL
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bl_pbl_physics=1MRF PBL scheme from MM5Non-local mixing in dry convective boundary layerDepth of PBL determined from critical bulk RiVertical diffusion depends on Ri in free atmosphere
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bl_pbl_physics=2Mellor-Yamada-Janjic (Eta) PBL1.5-order, level 2.5, TKE predictionLocal vertical mixing in boundary layer and free atmosphere
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cu_physics=1New Kain-Fritsch As in MM5 and Eta test versionIncludes shallow convectionCAPE removal time scaleMass flux type with updrafts and downdrafts, entrainment and detrainmentIncludes cloud detrainment
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cu_physics=2Betts-Miller-JanjicAs in Eta modelAdjustment type schemeNo explicit updraft or downdraft
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cu_physics=99Kain-Fritsch As in MM5CAPE removal time scaleMass flux type with updrafts and downdrafts, entrainment and detrainmentIncludes cloud detrainment
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(1) Level 2.5 TKE(2) Level 2 3d Smagorinsky(3) Constant diffusion
Subgrid Turbulence
IN WORKING ON PLANNED
2d Smagorinsky(mesoscale)
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Microphysics
(1) Kessler(2) Lin et al. [Purdue] (3) Cloud3 [NCEP](4) Cloud5 [NCEP](5) Eta (Ferrier)(6) Zhao-Carr(old eta)
GoddardNew Cloud3/5
Lin et al. 2Reisner 2
IN WORKING ON PLANNED
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Radiation
(1) RRTM(2) Eta (GFDL)
IN WORKING ON PLANNED
Goddard
Lon
gSh
ort (1) Dudhia [MM5]
(2) Goddard (3) Eta (GFDL)
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Boundary Layer
(1) MRF(2) Mellor-Yamada-
Janjic
(1) MRF Similarity(2) Eta Similarity
Bou
ndar
yla
yer
Surf
ace
laye
rL
and
surf
ace (1) 5-layer soil temp
(2) OSU/MM5 LSM
IN WORKING ON PLANNED
TGS LSM (RUC)Unified NOAH LSM
New MRF
CLM
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(1) New Kain-Fritsch
(2) Betts-Miller-Janjic [ETA](3) Old KF
New Grell
Cumulus
IN WORKING ON PLANNED