WRF ARW User's Guide - MMM - UCAR

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WRF-VAR files should be arranged as follows: directory name is the forecast initial time, time info in the file name is the forecast valid time. 2008020512/wrfout_d01_2008-02- 06_00:00:00 mean a 12-hour forecast valid at 2008020600 initialized at 2008020512. Example dataset for a test case (90 x 60 x 41 gridpoints) can be downloaded from http://www.mmm.ucar.edu/wrf/users/wrfda/download/testdata.html, untar the gen_be_forecasts_20080205.tar.gz, you will have: >ls $FC_DIR -rw-r--r-- 1 users 11556492 2008020512/wrfout_d01_2008-02-06_00:00:00 -rw-r--r-- 1 users 11556492 2008020512/wrfout_d01_2008-02-06_12:00:00 -rw-r--r-- 1 users 11556492 2008020600/wrfout_d01_2008-02-06_12:00:00 -rw-r--r-- 1 users 11556492 2008020600/wrfout_d01_2008-02-07_00:00:00 -rw-r--r-- 1 users 11556492 2008020612/wrfout_d01_2008-02-07_00:00:00 -rw-r--r-- 1 users 11556492 2008020612/wrfout_d01_2008-02-07_12:00:00 In the above example, only 1 day (12Z 05 Feb to 12Z 06 Feb. 2002) of forecasts, every 12 hours are supplied to gen_be_wrapper to estimate forecast error covariance. It is only for demonstration. The minimum number of forecasts required depends on the application, number of grid points, etc. Month-long (or longer) datasets are typical for the NMC-method. Generally, at least 1-month dataset should be used. Under WRFDA/var/scripts/gen_be, gen_be_wrapper.ksh is used to generate the BE data, following variables need to be set to fit your case: export WRFVAR_DIR=/users/noname/work/code/trunk/phoenix_g95_opt/WRFDA export START_DATE=2008020612 # the first perturbation valid date export END_DATE=2008020700 # the last perturbation valid date export NUM_LEVELS=40 # e_vert - 1 export BIN_TYPE=5 export FC_DIR=/users/noname/work/exps/friendlies/expt/fc # where wrf forecasts are export RUN_DIR=/users/noname/work/exps/friendlies/gen_be${BIN_TYPE} Note: The START_DATE and END_DATE are perturbation valid dates. As show in the forecast list above, when you have 24-hour and 12-hour forecasts initialized at 2008020512 through 2008020612, the first and final forecast difference valid dates are 2008020612 and 2008020700 respectively. Note: The forecast dataset should be located in $FC_DIR. Then type: > gen_be_wrapper.ksh Once gen_be_wrapper.ksh runs completed, the be.dat can be found under $RUN_DIR directory. To get a clear idea about what are included in be.dat, the script gen_be_plot_wrapper.ksh may be used to plot various data in be.dat such as: WRF-ARW V3: User’s Guide 6-36
Additional WRF-Var Exercises: (a) Single Observation response in WRF-Var: WRF-VAR With the single observation test, you may get the ideas how the background and observation error statistics working in the model variable space. Single observation test is done in WRF-Var by setting num_pseudo=1 along with other pre-specified values in record &wrfvar15 and &wrfvar19 of namelist.input, With the settings shown below, WRF-Var generates a single observation with prespecified innovation (Observation – First Guess) value at desired location e.g. at (in terms of grid coordinate) 23x23, level 14 for “U” observation with error characteristics 1 m/s, innovation size = 1.0 m/s. &wrfvar15 num_pseudo = 1, WRF-ARW V3: User’s Guide 6-37
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1. Overview − Introduction ......
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8. WRF Software − Introduction ..
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Table of Contents Chapter 1: Overvi
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OVERVIEW • Map projections for 1)
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Table of Contents Chapter 2: Softwa
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SOFTWARE INSTALLATION Note 1: If on
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Building the WRF Code SOFTWARE INST
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Building the WRF-Var Code SOFTWARE
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Chapter 3: WRF Preprocessing System
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WPS information specified by the us
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Required Libraries The only library
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ls drwxr-xr-x 2 4096 arch -rwxr-xr-
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should be written to may be indicat
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WPS When configuring a rotated lati
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WPS geog_data_path variable. Also,
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WPS supplied with Vtable files for
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&share wrf_core = 'ARW', max_dom =
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&share wrf_core = 'ARW', max_dom =
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that the MODIS-based categories sho
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should be set to a list of prefixes
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WPS If no field is found in more th
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WPS Output from the ungrib program
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5 19121.152344 0.093761623 6 19371.
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WPS ! 0 = cylindrical equidistant !
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The meanings of the level fields ar
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not possible to write a geogrid bin
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Description of the Namelist Variabl
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3. I_PARENT_START : A list of MAX_D
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21. POLE_LON : For the latitude-lon
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2. PRIORITY : An integer specifying
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Default value is null (i.e., no dom
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17. TILE_Y : An integer specifying
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5. FROM_INPUT : A character string
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21. FLAG_IN_OUTPUT : A character st
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6. wt_average_16pt : Weighted sixte
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Table 2: IGBP-Modified MODIS 20-cat
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float MAPFAC_MY(Time, south_north,
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:corner_lons = -93.64893f, -92.3966
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:SOUTH-NORTH_PATCH_END_UNSTAG = 60
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Table of Contents Chapter 4: WRF In
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INITIALIZATION programs should be r
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INITIALIZATION o Symmetric north an
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INITIALIZATION • Link the WPS fil
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Table of Contents Chapter 5: WRF Mo
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MODEL Hint: If using netCDF-4, make
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Enter appropriate options that are
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. Real-data case For a real-data ca
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MODEL eta_levels: model eta levels
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estart file named wrfrst_d_ will be
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Real Data Cases MODEL For real-data
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MODEL The purpose of this step is t
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f. Moving-Nested Run MODEL Two type
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MODEL Spectral Nudging is a new upp
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MODEL data and update these fields.
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MODEL If the model did not run to c
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2.1 Longwave Radiation (ra_lw_physi
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MODEL km_opt = 2 or 3, see below. A
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MODEL b. Vertical velocity damping
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MODEL The value of relax_zone may b
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MODEL cycling F whether this run is
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MODEL max_dom 1 number of domains -
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MODEL when SKINTEMP is not present.
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MODEL 0 no action taken, no adjustm
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MODEL 3 NCEP GFS scheme (NMM only),
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MODEL 5-layer slab scheme, set to l
Page 133 and 134: MODEL if_zfac_ph (max_dom) 0 0= nud
Page 135 and 136: MODEL obs_prt_freq (max_dom)10 freq
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Page 139 and 140: &grib2 MODEL background_proc_id 255
Page 141 and 142: MODEL &tc controls for tc_em.exe on
Page 143 and 144: float Q2(Time, south_north, west_ea
Page 145 and 146: E:units = "s-1" ; float SINALPHA(Ti
Page 147 and 148: map_proj = 1: Lambert Conformal Lis
Page 149 and 150: Table of Contents Chapter 6: WRF-Va
Page 151 and 152: WRF-VAR WARNING: It is impossible t
Page 153 and 154: 14. Darwin (MACOS) g95 with gcc (dm
Page 155 and 156: gzip -cd WRFNL3.1_PATCH.tar.gz | ta
Page 157 and 158: WRF-VAR Before running obsproc.exe,
Page 159 and 160: WRF-VAR There is an alternative way
Page 161 and 162: Observations Background Error Stati
Page 163 and 164: WRF-VAR / &wrfvar16 / &wrfvar17 / &
Page 165 and 166: Total number of obs. = 26726 Final
Page 167 and 168: ln -fs ad/ad_d01_2008-02-05_12:00:0
Page 169 and 170: WRF-VAR > ln -sf WRFDA/var/run/VARB
Page 171 and 172: WRF-VAR RTMINIT_NSENSOR = 12 # 5 AM
Page 173 and 174: WRF-VAR tions are present to keep t
Page 175 and 176: 6: U.S. Standard Atmosphere WRF-VAR
Page 177 and 178: WRF-VAR clwp: cloud liquid water pa
Page 179 and 180: WRF-VAR and/or low boundary conditi
Page 181 and 182: WRF-VAR Note: Larger analysis incre
Page 183: WRF-VAR The variance of each variab
Page 187 and 188: You may like to compare various dia
Page 189 and 190: WRF-VAR thin_mesh_conv 20. for ob_f
Page 191 and 192: WRF-VAR &wrfvar7 cv_options 5 3: NC
Page 193 and 194: WRF-VAR warnings_are_fatal false cl
Page 195 and 196: WRF-VAR use_antcorr false (max_inst
Page 197 and 198: 'v' = Y-direction component of wind
Page 199 and 200: WRF-VAR obs_gpspw_read.diag print_r
Page 201 and 202: write_satem If keep satem obs in ob
Page 203 and 204: Table of Contents Chapter 7: Object
Page 205 and 206: OBSGRID • Provide surface fields
Page 207 and 208: Banana Scheme OBSGRID In analyses o
Page 209 and 210: Objective Analysis on Model Nests O
Page 211 and 212: Check your output OBSGRID Examine t
Page 213 and 214: OBSGRID • All reports for each se
Page 215 and 216: Each report in the wrf_obs/little_r
Page 217 and 218: OBSGRID The end data record is simp
Page 219 and 220: OBSGRID remove_data_above_qc_flag 2
Page 221 and 222: Namelist Variable Value Description
Page 223 and 224: Namelist record8 OBSGRID The data i
Page 225 and 226: Chapter 8: WRF Software Table of Co
Page 227 and 228: SOFTWARE variable like MPICH_F90 to
Page 229 and 230: SOFTWARE time configuration options
Page 231 and 232: SOFTWARE While the model state and
Page 233 and 234: SOFTWARE u_gc. It is a three dimens
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Registry Rconfig: SOFTWARE The Regi
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SOFTWARE The parallel communication
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WRF source modules and subroutines
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Table of Contents • Introduction
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POST-PROCESSING It runs on many dif
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; load functions and procedures loa
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3. Create an NCL plotting script. 4
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POST-PROCESSING Resources unique to
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POST-PROCESSING If you want to add
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wrf_user_ll_to_ij (nc_file, lons, l
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NCL built-in Functions POST-PROCESS
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POST-PROCESSING Add the markers NCL
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RIP4 POST-PROCESSING RIP (which sta
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POST-PROCESSING Will use NETCDF in
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The RIP user input file POST-PROCES
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Plot Specification Table POST-PROCE
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e.g. idt rip_sample.cgm POST-PROCES
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POST-PROCESSING • gribinfo.txt &
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POST-PROCESSING plot ‘all’ Whic
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POST-PROCESSING User will be prompt
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WPP POST-PROCESSING The NCEP WRF Po
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./configure You will be given a lis
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POST-PROCESSING pressure fields on
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POST-PROCESSING • When using the
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POST-PROCESSING 7. Create namelist
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2. Add the location of the GrADS ex
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POST-PROCESSING Column integrated c
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POST-PROCESSING Direct soil evapora
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POST-PROCESSING • Animation Contr
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POST-PROCESSING For example, if the
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5. Read the VAPOR Documentation POS
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Table of Contents • Introduction
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UTILITIES AND TOOLS -ts Generate ti
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iowrf UTILITIES AND TOOLS This util
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fields List of fields to process. d
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&tc insert_bogus_storm = .true. rem
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./v_interp wrfinput_d01 wrfinput_d0
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Design WRF model domains WPS/util/p
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GRIB data UTILITIES AND TOOLS ncrca
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WRF ARW User's Guide - MMM - UCAR

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