WRF - Developmental Testbed Center

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e. ACM2 PBL: Asymmetric Convective Model with non-local upward mixing andlocal downward mixing (7).f. Quasi-Normal Scale Elimination PBL (4). A TKE-prediction option that uses a newtheory for stably stratified regions.g. Mellor-Yamada Nakanishi and Niino Level 2.5 PBL (5). Predicts sub-grid TKEterms.h. Mellor-Yamada Nakanishi and Niino Level 3 PBL (6). Predicts TKE and othersecond-moment terms.i. BouLac PBL (8): Bougeault-Lacarrère PBL. A TKE-prediction option. New inVersion 3.1. Designed for use with BEP urban model.Note: Two-meter temperatures are only available when running with MYJ scheme(2).Cumulus Parameterization (cu_physics)a. Kain-Fritsch scheme: Deep and shallow convection sub-grid scheme using a massflux approach with downdrafts and CAPE removal time scale (cu_physics = 1). (Thisscheme has been preliminarily tested for WRF-NMM.)b. Betts-Miller-Janjic scheme. Operational Eta scheme. Column moist adjustmentscheme relaxing towards a well-mixed profile (2). (This scheme is well tested forWRF-NMM, used operationally at NCEP.)c. Grell-Devenyi ensemble scheme: Multi-closure, multi-parameter, ensemble methodwith typically 144 sub-grid members (3). (This scheme has been preliminarily testedfor WRF-NMM.)d. Simplified Arakawa-Schubert scheme: Penetrative convection is simulatedfollowing Pan and Wu (1995), which is based on Arakawa and Schubert (1974) assimplified by Grell (1993) and with a saturated downdraft. (This scheme is well testedand used operationally at NCEP for HWRF.) Updated in Version 3.2.e. Grell 3d ensemble cumulus scheme. Scheme for higher resolution domains allowingfor subsidence in neighboring columns (5). New in Version 3.0.f. Old Kain-Fritsch scheme: Deep convection scheme using a mass flux approach withdowndrafts and CAPE removal time scale (99). (This scheme has been preliminarilytested for WRF-NMM.)WRF-NMM V3: User’s Guide 5-7
Other physics optionsa. gwd_opt: Gravity wave drag option. Can be activated when grid size is greater than10 km. May be beneficial for simulations longer than 5 days and over a large domainwith mountain ranges.b. momix: Coefficient used in the calculation of momentum mixing tendency terms.Default mommix=0.5. Only used with SAS cumulus scheme.c. h_diff: Coefficient used in the calculation of horizontal momentum diffusion terms.Default h_diff=1.0. Only used when environment variable HWRF is set.d. sfenth: Enthalpy flux factor. Default sfenth=0.0. Only used with GFDL surfacescheme.Operational ConfigurationBelow is a summary of physics options that are well-tested for WRF-NMM and are usedoperationally at NCEP:&physicsIdentifying Physics optionsNumbermp_physics (max_dom) 5 Microphysics-Ferrierra_lw_physics 99 Long-wave radiation - GFDL(Fels-Schwarzkopf)ra_sw_physics 99 Short-wave radiation - GFDL (Lacis-Hansen)sf_sfclay_physics 2 Surface-layer: Janjic schemesf_surface_physics 2 Noah Land Surfacebl_pbl_physics 2 Boundary-layer - Mellor-Yamada-Janjic TKEcu_physics 2 Cumulus - Betts-Miller-Janjic schemenum_soil_layers 4 Number of soil layers in land surface modelDescription of Namelist VariablesThe settings in the namelist.input file are used to configure WRF-NMM. This fileshould be edited to specify: dates, number and size of domains, time step, physicsoptions, and output options. When modifying the namelist.input file, be sure to take intoaccount the following points:time_step: The general rule for determining the time step of the coarsest grid followsfrom the CFL criterion. If d is the grid distance between two neighboring points (indiagonal direction on the WRF-NMM's E-grid), dt is the time step, and c is the phasespeed of the fastest process, the CFL criterion requires that:WRF-NMM V3: User’s Guide 5-8
Page 1 and 2: ForewordUser's Guide for the NMM Co
Page 3 and 4: • WPP Directory Structure 7-3•
Page 5 and 6: The WRF modeling system software is
Page 7 and 8: WRF-NMM FLOW CHARTTerrestrialDataMo
Page 9 and 10: Vendor Hardware OS CompilerCray X1
Page 11 and 12: If all of these executables are def
Page 13 and 14: Once the tar file is obtained, gunz
Page 15 and 16: HWRF is set, then (3) will be autom
Page 17 and 18: In addition to these three links, a
Page 19 and 20: • Real-data simulations• Non-hy
Page 21 and 22: k. Morrison double-moment scheme (1
Page 23: g. GFDL surface layer (88): (This s
Page 27 and 28: to the convergence of meridians app
Page 29 and 30: Variable NamesValue(Example)Descrip
Page 39 and 40: mpirun.lsf wrf.exeand for interacti
Page 41 and 42: The boundary conditions for the nes
Page 43 and 44: Examples:1. One nest and one level
Page 45 and 46: ottom_top_stag = 28 ;soil_layers_st
Page 47 and 48: float HLENSW(Time, south_north, wes
Page 49 and 50: float HBOTS(Time, south_north, west
Page 51 and 52: operational mesoscale Eta model. J.
Page 53 and 54: Mlawer, E. J., S. J. Taubman, P. D.
Page 55 and 56: NCEP WRF Postprocessor (WPP)WPP Int
Page 57 and 58: ./configureYou will be given a list
Page 59 and 60: equested output field. If the pre-r
Page 61 and 62: RAINCV SNOW HBOTRAINNCVSNOWCNote: F
Page 63 and 64: Running WPPFour scripts for running
Page 65 and 66: i. As the grid id of a pre-defined
Page 67 and 68: The GrADS package is available from
Page 69 and 70: Height on pressure surface HEIGHT O
Page 71 and 72: MELTPrecipitation type (4 types) -
Page 73 and 74: Press at tropopause PRESS AT TROPOP
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RIP4RIP IntroductionRIP (which stan
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A successful compilation will resul
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iinterp = 0v v v v vH V H V h h h h
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espectively, of the centered domain
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This can be either 'h' (for hours),
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eal variable expect values that are
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of all the requested trajectories a
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Creating Vis5D Dataset with RIPVis5
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User’s Guide for the NMM Core of
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Configuration: The configure script
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This program reads the contents of
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Period - Describes communications f
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fine grid), f (forcing, how the lat
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# halo HALO_NMM_K dyn_nmm8:q2;24:t
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(http://www.mmm.ucar.edu/wrf/WG2/Ti
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User's Guide for the NMM Core of th
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2. Make sure the files listed below
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User's Guide for the NMM Core of th
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Program geogridThe purpose of geogr
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1. Define a model coarse domain and
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to GEOGRID.TBL in the geogrid direc
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the GRIB data were downloaded to th
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By this point, there is generally n
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two nests are defined to have the s
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Note: For the WRF-NMM the variables
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simulations may use a constant SST
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entire simulation domain, and data
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that lists the variables and attrib
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http://www.ecmwf.int/products/data/
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intermediate formats (metgrid/src/r
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GRIB1| Level| From | To |Param| Typ
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corresponding source grid point. Gi
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tile_x = 1200tile_y = 1200tile_z =
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1. PARENT_ID : A list of MAX_DOM in
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V -DX- H| / |DY dx DY| / |H - DX- V
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intermediate files if ungrib is to
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the index and data tiles for the da
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1. PROJECTION : A character string
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25. SCALE_FACTOR : A real value tha
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10. INTERP_MASK : The name of the f
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1. four_pt : Four-point bi-linear i
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8. search : Breadth-first search in
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19 Mixed Tundra20 Barren TundraTabl
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LU_INDEX:units = "category" ;LU_IND
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netcdf met_em.d01.2009-01-05_12:00:
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}:ISOILWATER = 14 ;:grid_id = 1 ;:p
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WRF - Developmental Testbed Center

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