WRF - Developmental Testbed Center

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GRIB1| Level| From | To |Param| Type |Level1|Level2|-----+------+------+------+The "GRIB1 Param" field specifies the GRIB code for the meteorological field, which isa number unique to that field within the data set. However, different data sets may usedifferent GRIB codes for the same field – for example, temperature at upper-air levelshas GRIB code 11 in GFS data, but GRIB code 130 in ECMWF data. To find the GRIBcode for a field, the g1print.exe and g2print.exe utility program may be used.Given a GRIB code, the "Level Type", "From Level1", and "From Level2" fields areused to specify which levels a field may be found at. As with the "GRIB1 Param" field,the g1print.exe and g2print.exe programs may be used to find values for the level fields.The meanings of the level fields are dependent on the "Level Type" field, and aresummarized in the following table.Level Level Type From Level1 To Level2Upper-air 100 * (blank)Surface 1 0 (blank)Sea-level 102 0 (blank)Levels at a specified 105 Height, in meters, of (blank)height AGLthe level above groundFields given as layers 112 Starting level for thelayerEnding level forthe layerWhen layer fields (Level Type 112) are specified, the starting and ending points for thelayer have units that are dependent on the field itself; appropriate values may be foundwith the g1print.exe and g2print.exe utility programs.The second group of fields in a Vtable, those that describe how the data are identifiedwithin the metgrid and real programs, fall under the column headings shown below.| metgrid | metgrid | metgrid || Name | Units | Description |+----------+---------+-----------------------------------------+The most important of these three fields is the "metgrid Name" field, which determinesthe variable name that will be assigned to a meteorological field when it is written to theintermediate files by ungrib. This name should also match an entry in theMETGRID.TBL file, so that the metgrid program can determine how the field is to behorizontally interpolated. The "metgrid Units" and "metgrid Description" fields specifythe units and a short description for the field, respectively; here, it is important to note<strong>WRF</strong>-NMM V3: User’s Guide 3-27
that if no description is given for a field, then ungrib will not write that field out to theintermediate files.The final group of fields, which provide GRIB2-specific information, are found under thecolumn headings below.|GRIB2|GRIB2|GRIB2|GRIB2||Discp|Catgy|Param|Level|+-----------------------+The GRIB2 fields are only needed in a Vtable that is to be used for GRIB Edition 2 datasets, although having these fields in a Vtable does not prevent that Vtable from also beingused for GRIB Edition 1 data. For example, the Vtable.GFS file contains GRIB2 Vtablefields, but is used for both 1-degree (GRIB1) GFS and 0.5-degree (GRIB2) GFS datasets. Since Vtables are provided for most known GRIB Edition 2 data sets, thecorresponding Vtable fields are not described here at present.Writing Static Data to the Geogrid Binary FormatThe static geographical data sets that are interpolated by the geogrid program are storedas regular 2-d and 3-d arrays written in a simple binary raster format. Users with a newsource for a given static field can ingest their data with WPS by writing the data set intothis binary format. The geogrid format is capable of supporting single-level and multilevelcontinuous fields, categorical fields represented as dominant categories, andcategorical fields given as fractional fields for each category. The most simple of thesefield types in terms of representation in the binary format is a categorical field given as adominant category at each source grid point, an example of which is the 30-second USGSland use data set.For a categorical field given as dominant categories, the data must first be stored in aregular 2-d array of integers, with each integer giving the dominant category at the<strong>WRF</strong>-NMM V3: User’s Guide 3-28
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ForewordUser's Guide for the NMM Co
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• WPP Directory Structure 7-3•
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The WRF modeling system software is
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WRF-NMM FLOW CHARTTerrestrialDataMo
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Vendor Hardware OS CompilerCray X1
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If all of these executables are def
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Once the tar file is obtained, gunz
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HWRF is set, then (3) will be autom
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In addition to these three links, a
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• Real-data simulations• Non-hy
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k. Morrison double-moment scheme (1
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g. GFDL surface layer (88): (This s
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Other physics optionsa. gwd_opt: Gr
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to the convergence of meridians app
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Variable NamesValue(Example)Descrip
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mpirun.lsf wrf.exeand for interacti
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The boundary conditions for the nes
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Examples:1. One nest and one level
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ottom_top_stag = 28 ;soil_layers_st
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float HLENSW(Time, south_north, wes
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float HBOTS(Time, south_north, west
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operational mesoscale Eta model. J.
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Mlawer, E. J., S. J. Taubman, P. D.
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NCEP WRF Postprocessor (WPP)WPP Int
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./configureYou will be given a list
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equested output field. If the pre-r
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RAINCV SNOW HBOTRAINNCVSNOWCNote: F
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Running WPPFour scripts for running
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i. As the grid id of a pre-defined
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The GrADS package is available from
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Height on pressure surface HEIGHT O
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MELTPrecipitation type (4 types) -
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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),
Page 85: eal variable expect values that are
Page 88 and 89: of all the requested trajectories a
Page 90 and 91: Creating Vis5D Dataset with RIPVis5
Page 92 and 93: User’s Guide for the NMM Core of
Page 94 and 95: Configuration: The configure script
Page 96 and 97: This program reads the contents of
Page 98 and 99: Period - Describes communications f
Page 100 and 101: fine grid), f (forcing, how the lat
Page 102 and 103: # halo HALO_NMM_K dyn_nmm8:q2;24:t
Page 104 and 105: (http://www.mmm.ucar.edu/wrf/WG2/Ti
Page 106 and 107: User's Guide for the NMM Core of th
Page 108 and 109: 2. Make sure the files listed below
Page 110 and 111: User's Guide for the NMM Core of th
Page 112 and 113: Program geogridThe purpose of geogr
Page 114 and 115: 1. Define a model coarse domain and
Page 116 and 117: to GEOGRID.TBL in the geogrid direc
Page 118 and 119: the GRIB data were downloaded to th
Page 120 and 121: By this point, there is generally n
Page 122 and 123: two nests are defined to have the s
Page 124 and 125: Note: For the WRF-NMM the variables
Page 126 and 127: simulations may use a constant SST
Page 128 and 129: entire simulation domain, and data
Page 130 and 131: that lists the variables and attrib
Page 132 and 133: http://www.ecmwf.int/products/data/
Page 134 and 135: intermediate formats (metgrid/src/r
Page 138 and 139: corresponding source grid point. Gi
Page 140 and 141: tile_x = 1200tile_y = 1200tile_z =
Page 142 and 143: 1. PARENT_ID : A list of MAX_DOM in
Page 144 and 145: V -DX- H| / |DY dx DY| / |H - DX- V
Page 146 and 147: intermediate files if ungrib is to
Page 148 and 149: the index and data tiles for the da
Page 150 and 151: 1. PROJECTION : A character string
Page 152 and 153: 25. SCALE_FACTOR : A real value tha
Page 154 and 155: 10. INTERP_MASK : The name of the f
Page 156 and 157: 1. four_pt : Four-point bi-linear i
Page 158 and 159: 8. search : Breadth-first search in
Page 160 and 161: 19 Mixed Tundra20 Barren TundraTabl
Page 162 and 163: LU_INDEX:units = "category" ;LU_IND
Page 164 and 165: netcdf met_em.d01.2009-01-05_12:00:
Page 166: }:ISOILWATER = 14 ;:grid_id = 1 ;:p
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WRF - Developmental Testbed Center

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