namelist.input description

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WRF NAMELIST.INPUT FILE DESCRIPTION

The namelist.input file is used for both the real.exe and wrf.exe executables. Within the file, multiplecolumns are used for multiple domains (nests) and the “max_dom” parameter determines the number of domains (and nests) to use. So, for example, if you define 3 columns for parameter in the namelist but set max_dom = 2, the last column will be ignored.Note that not all parameters have multiple columns.

<WRF INSTALL DIR>/run/README.namelist contains descriptions of all the namelist variables as well as variables that can be added to the namelist for special model setups.
<WRF INSTALL DIR>/test/em_real directory contains several sample namelist.input files.

 

Name Value Description
&time_control Time control
run_days 1 run time in days
run_hours 0 run time in hours
Note: if it is more than 1 day, one may use both run_days and run_hours or just run_hours. e.g. if the total run length is 36 hrs, you may set run_days = 1, and run_hours = 12, or run_days = 0, and run_hours 36
run_minutes 0 run time in minutes
run_seconds 0 run time in seconds
start_year (max_dom) 2001 Four digit year of starting time
start_month (max_dom) 06 Two digit month of starting time
start_day (max_dom) 11 Two digit day of starting time
start_hour (max_dom) 12 Two digit hour of starting time
start_minute (max_dom) 00 Two digit minute of starting time
start_second (max_dom) 00 Two digit second of starting time. Note: the start time is used to name the first wrfout file. It also controls the start time for nest domains, and the time to restart
tstart (max_dom) 00 NMM–starting hour of forecast
end_year (max_dom) 2001 Four digit year of ending time
end_month (max_dom) 06 Two digit month of ending time
end_day (max_dom) 12 Two digit day of ending time
end_hour (max_dom) 12 Two digit hour of ending time
end_minute (max_dom) 00 Two digit minute of ending time
end_second (max_dom) 00 Two digit second of ending time. Note all end times also control when the nest domain integrations end. All start and end times are used byreal.exe. One may use either run_days/run_hours etc. or end_year/month/day/hour etc. to control the length of model integration. But run_days/run_hours takes precedence over the end times. Programreal.exe uses start and end times only.
interval_seconds 10800 time interval between incoming real data, which will be the interval between the lateral boundary condition file (for real only)
input_from_file (max_dom) .true. logical; whether nested run will have input files for domains other than 1
fine_input_stream (max_dom) selected fields from nest input
0 all fields from nest input are used
2 only nest input specified from input stream 2 (defined in the Registry) are used
history_interval (max_dom) 60 history output file interval in minutes (integer only)
history_interval_mo (max_dom) 1 history output file interval in months (integer); used as alternative to history_interval
history_interval_d (max_dom) 1 history output file interval in days (integer); used as alternative to history_interval
history_interval_h (max_dom) 1 history output file interval in hours (integer); used as alternative to history_interval
history_interval_m (max_dom) 1 history output file interval in minutes (integer); used as alternative to history_interval and is equivalent to history_interval
history_interval_s (max_dom) 1 history output file interval in seconds (integer); used as alternative to history_interval
frames_per_outfile (max_dom) 1 output times per history output file, used to split output files into smaller pieces
restart whether this run is a restart run
.false. = not a restart
cycling .false. whether this run is a cycling run, if so, initializes look-up table for Thompson schemes only
restart_interval 1440 restart output file interval in minutes
reset_simulation_start .false. whether to overwrite simulation_start_date with forecast start time
Auxinput1_inname input from WPS (this is the default):
“met_em.d<domain>_<date>”
input from SI:
“wrf_real_input_em.d<domain>_<date>”
io_form_history 2 1 = binary format (no supported post-processing software available)
2 = netCDF
4 = PHDF5 format (no supported post-processing software available)
5 = GRIB 1
10 = GRIB 2
102 = split netCDF files one per processor (no supported post-processing software for split files)
io_form_restart 2 2 = netCDF; 102 = split netCDF files one per processor (must restart with the same number of processors)
io_form_input 2 2 = NetCDF
io_form_boundary 2 1 = binary format (no supported post-processing software)
2 = netCDF
4 = PHDF5 format (no supported post-processing software)
5 = GRIB1 format (no supported post-processing software)
frames_per_emissfile 12 Number of times in each chemistry emission file.
io_style_emiss 1 Style to use for the chemistry emission files. 0 = Do not read emissions from files,
1 = Cycle between two 12 hour files (set frames_per_emissfile=12), 2 = Dated files with length set by frames_per_emissfile
debug_level 0 0,50,100,200,300 values give increasing prints
auxinput1_inname EM Core:
Input to real from WPS: “met_em.d<domain>.<date>”, to Input to real from SI: “wrf_real_input_em.d<domain>.<date>”

NMM Core:
Input to real from WPS: “met_nm.d<domain>.<date>”
Input to real from SI: “wrf_real_input_nm.d<domain>.<date>”

auxhist2_outname “rainfall_d<domain>”–file name for extra output; if not specified, auxhist2_d<domain>_<date> will be used. Also note that to write variables in output other than the history file requires Registry.EM file change
auxhist2_interval 10 interval in minutes
io_form_auxhist2 2 output in netCDF
auxinput4_inname “wrflowinp_d<domain>”
auxinput4_interval 360 minutes generally matches time given by interval_seconds
nocolons .false. replace : with _ in output file names
write_input .true. write input-formatted data as output for 3DVAR application
inputout_interval 180 interval in minutes when writing input-formatted data
input_outname Output file name from 3DVAR
“wrf_3dvar_input_d<domain>_<date>”
inputout_begin_y 0 beginning year to write 3DVAR data
inputout_begin_mo 0 beginning month to write 3DVAR data
inputout_begin_d 0 beginning day to write 3DVAR data
inputout_begin_h 3 beginning hour to write 3DVAR data
Inputout_begin_m 0 beginning minute to write 3DVAR data
inputout_begin_s 0 beginning second to write 3DVAR data
inputout_end_y 0 ending year to write 3DVAR data
inputout_end_mo 0 ending month to write 3DVAR data
inputout_end_d 0 ending day to write 3DVAR data
inputout_end_h 12 ending hour to write 3DVAR data
Inputout_end_m 0 ending minute to write 3DVAR data
inputout_end_s 0 ending second to write 3DVAR data.
The above example shows that the input-formatted data are output starting from hour 3 to hour 12 in 180 min interval.

 

&domains domain def: dimensions, nesting params
time_step 60 time step for integration in integer seconds (recommended 6*dx in km for a typical case)
time_step_fract_num 0 numerator for fractional time step
time_step_fract_den 1 denominator for fractional time step Example, if you want to use 60.3 sec as your time step, set time_step = 60, time_step_fract_num = 3, and time_step_fract_den = 10
max_dom 1 number of domains – set it to > 1 if it is a nested run
s_we (max_dom) 1 start index in x (west-east) direction (leave as is)
e_we (max_dom) 91 end index in x (west-east) direction (staggered dimension)
s_sn (max_dom) 1 start index in y (south-north) direction (leave as is)
e_sn (max_dom) 82 end index in y (south-north) direction (staggered dimension)
s_vert (max_dom) 1 start index in z (vertical) direction (leave as is)
e_vert (max_dom) 28 number of vertical eta levels. end index in z (vertical) direction. Same value for all nests.
num_metgrid_soil_levels 4 number of vertical soil levels or layers input. from WPS metgrid program
num_metgrid_levels 27 number of vertical levels in the incoming data: type ncdump –h to find out

(WPS data only)

eta_levels 1.0..0.0 model eta levels (WPS data only). If a user does not specify this, real will provide a set of levels
force_sfc_in_vinterp 1 use surface data as lower boundary when interpolating through this many eta levels
p_top_requested 5000 p_top to use in the model
ptsgm 42000 FOR NMM: defines the pressure interface dividing
; the terrain following portion of the hybrid vertical
; coordinate (p > ptsgm) and the purely
; isobaric portion of the vertical coordinate (p < ptsgm)
vert_refine_fact 1 vertical refinement factor for ndown
sfcp_to_sfcp .false. Optional method to compute model’s surface pressure when incoming
; data only has surface pressure and terrain, but not SLP
smooth_cg_topo .false. Smooth the outer rows and columns of domain 1’s topography w.r.t.
; the input data
use_tavg_for_tsk .false. whether to use diurnally averaged surface temp as skin temp. The
diurnall averaged surface temp can be computed using WPS utility
avg_tsfc.exe. May use this option when SKINTEMP is not present.
extrap_type 2 vertical extrapolation of non-temperature fields. 1 = extrapolate using the two lowest levels. 2 = use lowest level as constant below ground
t_extrap_type 2 vertical extrapolation for potential temperature. 1 = isothermal
; 2 = -6.5 K/km lapse rate for temperature
; 3 = constant theta
use_levels_below_ground .true. in vertical interpolation, use levels below input surface level
; T = use input isobaric levels below input surface
; F = extrapolate when WRF location is below input surface value
use_surface .true. use the input surface level data in the vertical interp and extrap
; T = use the input surface data
; F = do not use the input surface data
zap_close_levels 500 ignore isobaric level above surface if delta p (Pa) < zap_close_levels
interp_type 2 vertical interpolation; 1: linear in pressure; 2: linear in log (pressure)
lagrange_order 1 vertical interpolation order; 1: linear; 2: quadratic
lowest_lev_from_sfc .false. T = use surface values for the lowest eta (u,v,t,q); F = use traditional interpolation
dx (max_dom) 10000 grid length in x direction, unit in meters
dy (max_dom) 10000 grid length in y direction, unit in meters
ztop (max_dom) 19000. used in mass model for idealized cases
grid_id (max_dom) 1 domain identifier
parent_id (max_dom) 0 id of the parent domain
i_parent_start (max_dom) 0 starting LLC I-indices from the parent domain
j_parent_start (max_dom) 0 starting LLC J-indices from the parent domain
parent_grid_ratio (max_dom) 1 parent-to-nest domain grid size ratio: for real-data cases the ratio has to be odd; for idealized cases, the ratio can be even if feedback is set to 0.
parent_time_step_ratio (max_dom) 1 parent-to-nest time step ratio; it can be different from the parent_grid_ratio
feedback 1 feedback from nest to its parent domain; 0 = no feedback
smooth_option 0 smoothing option for parent domain, used only with feedback option on.
0 = no smoothing
1 = 1-2-1 smoothing
2 = smoothing-desmoothing
Namelist variables for controlling the moving nest option:
Note that moving nest needs to be activated at the compile time by adding -DMOVE_NESTS to the ARCHFLAGS. The maximum number of moves, max_moves, is set to be 50, but can be modified in source code fileframe/module_driver_constants.F
num_moves 4 total number of moves for all domains
move_id (max_moves) 2,2,2,2 a list of nest domain id’s, one per move
move_interval (max_moves) 60,120,150,180 time in minutes since the start of this domain
move_cd_x (max_moves) 1,1,0-1, the number of parent domain grid cells to move in i direction
move_cd_y (max_moves) 1,0,-1,1 the number of parent domain grid cells to move in j direction (positive in increasing i/j directions, and negative in decreasing i/j directions. The limitation now is to move only 1 grid cell at each move.
vortex_interval (max_dom) 15 how often the new vortex position is computed
max_vortex_speed (max_dom) 40 used to compute the search radius for the new vortex position
corral_dist (max_dom) 8 how many coarse grid cells the moving nest is allowed to get near the coarse grid boundary
track_level 50000 pressure value in Pa where the vortex is tracked
time_to_move (max_dom) 0 time (in minutes) to start the moving nests
tile_sz_x 0 number of points in tile x direction
tile_sz_y 0 number of points in tile y direction can be determined automatically
numtiles 1 number of tiles per patch (alternative to above two items)
nproc_x -1 number of processors in x for decomposition
nproc_y -1 number of processors in y for decomposition -1: code will do automatic decomposition >1: for both: will be used for decomposition
ARW Core Only: Adaptive time step option
use_adaptive_time_step .false. T/F use adaptive time stepping, ARW only
step_to_output_time .true. if adaptive time stepping, T/F modify the
time steps so that the exact history time is reached
target_cfl (max_dom) 1.2,1.2 vertical and horizontal CFL <= to this value implies
no reason to reduce the time step, and to increase it
max_step_increase_pct (max_dom) 5,51 percentage of previous time step to increase, if the
max(vert cfl, horiz cfl) <= target_cfl, then the time
will increase by max_step_increase_pct. Use something
starting_time_step (max_dom) -1,-1 flag = -1 implies use 6 * dx (defined in start_em),
starting_time_step = 100 means the starting time step
max_time_step (max_dom) -1,-1 flag = -1 implies max time step is 3 * starting_time_step,
max_time_step = 100 means that the time step will not
min_time_step (max_dom) -1,-1 flag = -1 implies max time step is 0.5 * starting_time_step,
min_time_step = 100 means that the time step will not
adaptation_domain 1 default, all fine grid domains adaptive dt driven by coarse-grid
; 2 = Fine grid domain #2 determines the fundamental adaptive dt.

 

&dfi_control Grib2
dfi_opt 0 which DFI option to use (3 is recommended)
; 0 = no digital filter initialization
; 1 = digital filter launch (DFL)
; 2 = diabatic DFI (DDFI)
; 3 = twice DFI (TDFI)
dfi_nfilter 7 digital filter type to use (7 is recommended)
; 0 = uniform
; 1 = Lanczos
; 2 = Hamming
; 3 = Blackman
; 4 = Kaiser
; 5 = Potter
; 6 = Dolph window
; 7 = Dolph
; 8 = recursive high-order
dfi_write_filtered_input .true. whether to write wrfinput file with filtered
; model state before beginning forecast
dfi_write_dfi_history .false. whether to write wrfout files during filtering integration
dfi_cutoff_seconds 3600 cutoff period, in seconds, for the filter
dfi_time_dim 1000 maximum number of time steps for filtering period
; this value can be larger than necessary
dfi_bckstop_year 2004 four-digit year of stop time for backward DFI integration
dfi_bckstop_month 03 two-digit month of stop time for backward DFI integration
dfi_bckstop_day 14 two-digit day of stop time for backward DFI integration
dfi_bckstop_hour 12 two-digit hour of stop time for backward DFI integration
dfi_bckstop_minute 00 two-digit minute of stop time for backward DFI integration
dfi_bckstop_second 00 two-digit second of stop time for backward DFI integration
dfi_fwdstop_year 2004 four-digit year of stop time for forward DFI integration
dfi_fwdstop_month 03 two-digit month of stop time for forward DFI integration
dfi_fwdstop_day 13 two-digit month of stop time for forward DFI integration
dfi_fwdstop_hour 12 two-digit month of stop time for forward DFI integration
dfi_fwdstop_minute 00 two-digit month of stop time for forward DFI integration
dfi_fwdstop_second 00 two-digit month of stop time for forward DFI integration
dfi_radar 0 DFI radar da switch

 

physics physics options
chem_opt 0 chemistry option – use WRF-Chem
mp_physics (max_dom) microphysics option
0 no microphysics
1 Kessler scheme: : A warm-rain (i.e. no ice) scheme used commonly in idealized cloud modeling studies.
2 Lin et al. scheme: a sophisticated scheme that has ice, snow and graupel processes, suitable for real-data high-resolution simulations.
3 WRF Single-Moment (WSM) 3-class simple ice scheme: A simple efficient scheme with ice and snow processes suitable for mesoscale grid sizes.
4 WRF Single-Moment (WSM) 5-class scheme. A slightly more sophisticated version of option 3 that allows for mixed-phase processes and super-cooled water. This scheme has been preliminarily tested for WRF-NMM.
5 Ferrier scheme: A scheme that includes prognostic mixed-phase processes. This scheme was recently changed so that ice saturation is assumed at temperatures colder than -30C rather than -10C as in the original implementation. This scheme is well tested for WRF-NMM, used operationally at NCEP.
6 WSM 6-class graupel scheme: A new scheme with ice, snow and graupel processes suitable for high-resolution simulations. This scheme has been preliminarily tested for WRF-NMM.
7 Goddard GCE scheme (also uses gsfcgce_hail, gsfcgce_2ice)
8 Thompson graupel scheme: a scheme with six classes of moisture species plus number concentration for ice as prognostic variables. This scheme has been preliminarily tested for WRF-NMM.
10 Morrison 2-moment scheme
14 WDM 5-class scheme
16 WDM 6-class scheme
98 Thompson scheme (version from V3.0)
mp_zero_out For non-zero mp_physics options, to keep Qv >= 0, and to set the other moisture fields < a threshold value to zero
0 no action taken, no adjustment to any moist field
1 except for Qv, all other moist arrays are set to zero if they fall below a critical value
2 Qv is >= 0, all other moist arrays are set to zero if they fall below a critical value
mp_zero_out_thresh 1.e-8 critical value for moisture variable threshold, below which moist arrays (except for Qv) are set to zero (unit: kg/kg)
ra_lw_physics (max_dom) longwave radiation option
gsfcgce_hail 0 0= for running gsfcgce microphysics with graupel, 1 =for running gsfcgce microphysics with hail
gsfcgce_2ice 0 0=for running with snow, ice and graupel/hail, 1=for running with only ice and snow, 2=for running with only ice and graupel (only used in very extreme situation). gsfcgce_hail is ignored if gsfcgce_2ice is set to 1 or 2.
no_mp_heating 0 0=normal, 1=turn off latent heating from a microphysics scheme
ra_lw_physics (max_dom) longwave radiation option
0 no longwave radiation
1 RRTM scheme: Rapid Radiative Transfer Model. An accurate scheme using look-up tables for efficiency. Accounts for multiple bands, trace gases, and microphysics species. This scheme has been preliminarily tested for WRF-NMM.
3 CAM scheme
4 rrtmg scheme
31 Earth Held-Suarez forcing
99 GFDL scheme: Geophysical Fluid Dynamics Laboratory (GFDL) longwave. An older version multi-band, transmission table look-up scheme with carbon dioxide, ozone and water vapor absorptions. Cloud microphysics effects are included. This scheme is well tested for WRF-NMM, used operationally at NCEP.
Note: If it is desired to run GFDL with a microphysics scheme other than Ferrier, a modification to module_ra_gfdleta.F is needed to comment out (!) #define FERRIER_GFDL.
ra_sw_physics (max_dom) shortwave radiation option
0 no shortwave radiation
1 Dudhia scheme: Simple downward integration allowing for efficient cloud and clear-sky absorption and scattering. This scheme has been preliminarily tested for WRF-NMM.
2 Goddard Shortwave scheme: Two-stream multi-band scheme with ozone from climatology and cloud effects.
3 CAM scheme -also must set levsiz, paerlev, cam_abs_dim1/2 (see below)
4 rrtmg scheme
99 GFDL scheme: Geophysical Fluid Dynamics Laboratory (GFDL) shortwave. A two spectral bands, k-distribution scheme with ozone and water vapor as the main absorbing gases. Cloud microphysics effects are included. This scheme is well-tested for WRF-NMM, used operationally at NCEP.
Note: If it is desired to run GFDL with a microphysics scheme other than Ferrier, a modification to module_ra_gfdleta.F is needed to comment out (!) #define FERRIER_GFDL.
radt (max_dom) 30 minutes between radiation physics calls. Recommend 1 minute per km of dx (e.g. 10 for 10 km grid)
nrads (max_dom) NMM only – number of fundamental timesteps between
calls to shortwave radiation; the value
is set in Registry.NMM but is overridden
by namelist value; radt will be computed
from this.
nradl (max_dom) NMM only – number of fundamental timesteps between
calls to longwave radiation; the value
is set in Registry.NMM but is overridden
by namelist value.
co2tf 1 CO2 transmission function flag for GFDL radiation only. Set it to 1 for ARW, which allows generation of CO2 function internally
ra_call_offset 0 radiation call offset. 0 (no offset), =-1 (old offset)
cam_abs_freq_s 21600 CAM clearsky longwave absorption calculation frequency (recommended minimum value to speed scheme up)
levsiz 59 for CAM radiation input ozone levels
paerlev 29 for CAM radiation input aerosol levels
cam_abs_dim1 4 for CAM absorption save array
cam_abs_dim2 for CAM 2nd absorption save array
(same as e_vert)
sf_sfclay_physics (max_dom) surface-layer option
0 = no surface-layer
1 = Monin-Obukhov Similarity scheme: Based on Monin-Obukhov with Carslon-Boland viscous sub-layer and standard similarity functions from look-up tables
2 = Monin-Obukhov (Janjic Eta) Similarity scheme: Based on similarity theory with viscous sublayers both over solid surfaces and water points. This scheme is well tested for WRF-NMM, used operationally at NCEP
3 = NCEP GFS scheme (NMM only)
7 = Pleim-Xu (ARW only), only tested with Pleim-Xu surface and ACM2 PBL
sf_surface_physics (max_dom) land-surface option (set before running real; also set correct num_soil_layers)
0 0 = no surface temp prediction
1 Thermal Diffusion scheme: soil temperature only scheme, using five layers.
2 Noah Land-Surface Model: Unified NCEP/NCAR/AFWA scheme with soil temperature and moisture in four layers, fractional snow cover and frozen soil physics. This scheme has been preliminarily tested for WRF-NMM.
3 RUC Land-Surface Model: Rapid Update Cycle operational scheme with soil temperature and moisture in six layers, multi-layer snow and frozen soil physics. This scheme has been preliminarily tested for WRF-NMM.
7 Pleim-Xu scheme (ARW only)
sf_urban_physics (max_dom) 0 0 activate urban canopy model (in Noah LSM only)
1 Single-layer, UCM
2 Multi-layer, BEP scheme (works only with MYJ and BouLac PBL)
bl_pbl_physics (max_dom) boundary-layer option
0 = no boundary-layer
1 = YSU scheme
2 = Mellor-Yamada-Janjic (Eta) TKE scheme
3 = NCEP GFS scheme (NMM only)
4= Quasi-Normal Scale Elimination PBL
5= MYNN 2.5 level TKE scheme, works with sf_sfclay_physics=1 or 2 as well as 5
6= MYNN 3rd level TKE scheme, works only MYNNSFC (sf_sfclay_physics = 5)
7 = ACM2 (Pleim) scheme
8= Bougeault and Lacarrere (BouLac) PBL
99 = MRF scheme
bldt (max_dom) 0 minutes between boundary-layer physics calls
0 = call every time step
grav_settling 0 MYNN PBL only; gravitational settling of fog/cloud droplets (1=yes)
nphs (max_dom) NMM only: number of fundamental timesteps between calls to turbulence and microphysics; the value is set in Registry.NMM but is overridden by namelist value; bldt will be computed from this.
cu_physics (max_dom) cumulus option
0 no cumulus
1 Kain-Fritsch (new Eta) scheme: deep and shallow sub-grid scheme using a mass flux approach with downdrafts and CAPE removal time scale
2 Betts-Miller-Janjic scheme: adjustment scheme for deep and shallow convection relaxing towards variable temperature and humidity profiles determined from thermodynamic considerations.
3 Grell-Devenyi ensemble scheme: Multi-closure, multi-parameter, ensemble method with typically 144 sub-grid members
4 Simplied Arakawa-Schubert (NMM only). Penetrative convection is simulated following Pan and Wu (1995), which is based on Arakawa and Schubert (1974) as simplified by Grell (1993) and with a saturated downdraft.
5 Grell 3D ensemble scheme
99 previous Kain-Fritsch scheme
ishallow 1 Shallow convection used with Grell 3D ensemble scheme (cu_physics = 5)
cudt 0 minutes between cumulus physics calls. For example, 10.0 minutes. 0 = call every time step
cugd_avedx 1 number of grid boxes over which subsidence is spread. Default is 1
1 default, for large grid distances
3 for small grid distances (DX < 5 km)
ncnvc (max_dom) NMM only: number of fundamental timesteps between
calls to convection; the value is set in Registry.NMM
but is overridden by namelist value; cudt will be
computed from this.
tprec (max_dom) FOR NMM: number of hours in precipitation bucket
theat (max_dom) FOR NMM: number of hours in latent heating bucket
tclod (max_dom) FOR NMM: number of hours in cloud fraction average
trdsw (max_dom) FOR NMM: number of hours in short wave buckets
trdlw (max_dom) FOR NMM: number of hours in long wave buckets
tsrfc (max_dom) FOR NMM: number of hours in surface flux buckets
pcpflg FOR NMM: logical switch for precipitation assimilation
isfflx 1 heat and moisture fluxes from the surface
1 = with fluxes from the surface
0 = no flux from the surface (not for sf_surface_sfclay = 2).
If diff_opt=2, km_opt=2 or 3 then
0 = constant fluxes defind by tke_drag_coefficient, tke_heat_flux;
1 = use model computed u*, and heat and moisture fluxes;
2 = use model computed u*, and specified heat flux by tke_heat_flux
ifsnow 0 snow-cover effects (only works for sf_surface_physics = 1)
0 = without snow-cover effect
1 = with snow-cover effect
icloud 1 cloud effect to the optical depth in radiation (only works for ra_sw_physics = 1 and ra_lw_physics = 1)
0 = without cloud effect
1 = with cloud effect
swrat_scat 1. Scattering tuning parameter (default 1 is 1.e-5 m2/kg)
surface_input_source 1,2 where landuse and soil category data come from
1 = WPS/geogrid
2 = GRIB data from another model (only if arrays VEGCAT/SOILCAT exist)
num_soil_layers number of soil layers in land surface model (set in real)
2 = Pleim-Xu land-surface model
4 = Noah land-surface model
5 = thermal diffusion scheme for temp only
6 = RUC land-surface model
num_land_cat 24 number of land categories in input data
num_soil_cat 16 number of soil categories in input data
pxlsm_smois_init (max_dom) 1 PXLSM Soil moisture initialization option
0 – From analysis, 1 – From MAVAIL
maxiens 1 Grell-Devenyi only
maxens 3 G-D only
maxens2 3 G-D only
maxens3 16 G-D only
ensdim 144 G-D only. These are recommended numbers. If you would like to use any other number, consult the code, know what you are doing.
seaice_threshold 271. tsk < seaice_threshold, if water point and 5-layer slab scheme, set to land point and permanent ice; if water point and Noah scheme, set to land point, permanent ice, set temps from 3 m to surface, and set smois and sh2o
sst_update option to use time-varying SST during a model simulation (set in real)
0 no SST update
1 real.exe will create wrflowinp_d01 file at the same time interval as the available input data. To use it in wrf.exe, add auxinput5_inname = “wrflowinp_d01”, auxinput5_interval, and auxinput5_end_h in namelist section &time_control
usemonalb .true. use monthly albedo map instead of table value
; (must be used for NMM and recommended for sst_update=1)
rdmaxalb .true. use snow albedo from geogrid; false means using values from table
rdlai2d .false. use LAI from input; false means using values from table
bucket_mm -1. bucket reset value for water accumulations (value in mm, -1.=inactive)
bucket_J -1. bucket reset value for energy accumulations (value in J, -1.=inactive)
tmn_update 0 update deep soil temperature (1, yes; 0, no)
lagday 150 days over which tmn is computed using skin temperature
sst_skin 0 calculate skin SST
slope_rad (max_dom) 0 slope effects for ra_sw_physics=1 (1=on, 0=off)
topo_shading (max_dom) 0 neighboring-point shadow effects for ra_sw_physics=1 (1=on, 0=off)
shadlen 25000 max shadow length in meters for topo_shading=1
omlcall 0 activate simple ocean mixed layer model (0=no, 1=yes); works with
sf_surface_physics = 1 only
oml_hml0 50 oml model can be initialized with a constant depth everywhere (m)
oml_gamma 0.14 oml deep water lapse rate (K m-1)
isftcflx 0 alternative Ck, Cd formulation for tropical storm application (0=default, 1=new)
fractional_seaice 0 treat sea-ice as fractional field (1) or ice/no-ice flag (0)
iz0tlnd 0 thermal roughness length for sfclay and myjsfc (0 – old, 1 – veg dependent Czil)
mp_tend_lim 10 limit on temp tendency from mp latent heating from radar data assimilation
prec_acc_dt (max_dom) 0 number of minutes in precipitation bucket (ARW only) – will add three
new 2d output fields: prec_acc_c, prec_acc_nc and snow_acc_nc

 

&fdda (grid nudging) for grid and obs nudging
grid_fdda (max_dom) 1 grid-nudging on (=0 off) for each domain
gfdda_inname Defined name in real
“wrffdda_d<domain>”
gfdda_interval_m (max_dom) 360 Time interval (min) between analysis times
gfdda_end_h (max_dom) 6 Time (in hours) to stop nudging after start of forecast
io_form_gfdda 2 Analysis format (2 = netcdf)
fgdt (max_dom) 0 Calculation frequency (in minutes) for analysis nudging.
0 = every time step, recommended
if_no_pbl_nudging_uv (max_dom) 0 0 = nudging in the pbl
1 = no nudging of u and v in the pbl
if_no_pbl_nudging_t (max_dom) 0 1= no nudging of temp in the pbl,
0=nudging in the pbl
if_no_pbl_nudging_q (max_dom) 0 1= no nudging of qvapor in the pbl,
0=nudging in the pbl
if_zfac_uv (max_dom) 0 0 = nudge u and v all layers
1 = limit nudging to levels above k_zfac_uv
k_zfac_uv 10 10 = model level below which nudging is switched off for u and v
if_zfac_t (max_dom) 0
k_zfac_t 10 10 = model level below which nudging is switched off for temp
if_zfac_q (max_dom) 0
k_zfac_q 10 10 = model level below which nudging is switched off for water qvapor
guv (max_dom) 0.0003 nudging coefficient for u and v (sec-1)
gt (max_dom) 0.0003 nudging coefficient for temp (sec-1)
gq (max_dom) 0.0003 nudging coefficient for qvapor (sec-1)
if_ramping 0 0= nudging ends as a step function, 1= ramping nudging down at end of period
dtramp_min 60. time (min) for ramping function, 60.0=ramping starts at last analysis time,

-60.0=ramping ends at last analysis time

grid_sfdda (max_dom) 0 surface fdda switch (1, on; 0, off)
sgfdda_inname “wrfsfdda_d<domain>” ; defined name for sfc nudgingi in input file (from program obsgrid)
sgfdda_end_h (max_dom) 6 time (in hours) to stop sfc nudging after start of forecast
sgfdda_interval_m (max_dom) 180 time interval (in min) between sfc analysis times (must use minutes)
io_form_sgfdda 2 sfc analysis data io format (2 = netCDF)
guv_sfc (max_dom) 0.0003 nudging coefficient for sfc u and v (sec-1)
gt_sfc (max_dom) 0.0003 nudging coefficient for sfc temp (sec-1)
gq_sfc (max_dom) 0.0003 nudging coefficient for sfc qvapor (sec-1)
rinblw 250.0 radius of influence used to determine the confidence (or weights) for
the analysis, which is based on the distance between the grid point to the nearest
obs. The analysis without nearby observation is used at a reduced weight.
(for spectral nudging)
fgdtzero (max_dom) 0 nudging tendencies are set to zero in between fdda calls
if_no_pbl_nudging_ph 0 1= no nudging of ph in the pbl, 0= nuding in the pbl
if_zfac_ph (max_dom) 0 0= nudge ph in all layers, 1= limit nudging to levels above k_zfac_ph
k_zfac_ph (max_dom) 10 10= model level below which nudging is switched off for ph
dk_zfac_uv (max_dom) 1 depth in k between k_zfac_X to dk_zfac_X where nudging increases
linearly to full strength
dk_zfac_t (max_dom) 1
dk_zfac_ph (max_dom) 1
gph (max_dom) 0.0003
xwavenum (max_dom) 3 top wave number to nudge in x direction
ywavenum (max_dom) 3 top wave number to nudge in y direction
(for obs nudging) Observation nudging
obs_nudge_opt (max_dom) 1 0 = obs-nudging fdda off
1 = obs-nudging fdda on
for each domain: also need to set auxinput11_interval and auxinput11_end_h in time_control namelist
max_obs 150000 max number of observations used on a domain during any given time window
fdda_start 0. obs nudging start time in minutes
fdda_end 180. obs nudging end time in minutes
obs_nudge_wind (max_dom) 1 whether to nudge wind: (=0 off)
obs_coef_wind (max_dom) 6.e-4 nudging coefficient for wind, unit: s-1
obs_nudge_temp (max_dom) 1 whether to nudge temperature: (=0 off)
obs_coef_temp (max_dom) 6.e-4 nudging coefficient for temp, unit: s-1
obs_nudge_mois (max_dom) 1 whether to nudge water vapor mixing ratio: (=0 off)
obs_coef_mois (max_dom) 6.e-4 nudging coefficient for water vapor mixing ratio, unit: s-1
obs_nudge_pstr (max_dom) 0 whether to nudge surface pressure (not used)
obs_coef_pstr (max_dom) 0. nudging coefficient for surface pressure, unit: s-1 (not used)
obs_rinxy 200. horizontal radius of influence in km
obs_rinsig 0.1 vertical radius of influence in eta
obs_twindo 0.6667 half-period time window over which an observation will be used for nudging; the unit is in hours
obs_npfi 10 freq in coarse grid timesteps for diag prints
obs_ionf 2 freq in coarse grid timesteps for obs input and err calc
obs_idynin 0 for dynamic initialization using a ramp-down function to gradually turn off the FDDA before the pure forecast (=1 on)
obs_dtramp 40. time period in minutes over which the nudging is ramped down from one to zero.
obs_nobs_prt (max_dom) 10 Number of current obs to print grid coord. info.
obs_ipf_in4dob .true. print obs input diagnostics (=.false. off)
obs_ipf_errob .true. .false. = don’t print obs error diagnostics
.true. = print obs error diagnostics
obs_ipf_nudob .true. .false. = don’t print obs nudge diagnostics
.true. = print obs nudge diagnostics
obs_ipf_init .true. Enable obs init warning messages
obs_no_pbl_nudge_uv (max_dom) 0 1=no wind-nudging within pbl
obs_no_pbl_nudge_t (max_dom) 0 1=no temperature-nudging within pbl
obs_no_pbl_nudge_q (max_dom) 0 1=no moisture-nudging within pbl
obs_nudgezfullr1_uv 50 Vert infl full weight height for lowest model level (LML) ; obs, regime 1, winds
obs_nudgezrampr1_uv 50 Vert infl ramp-to-zero height for LML obs, regime 1, winds
obs_nudgezfullr2_uv 50 Vert infl full weight height for LML obs, regime 2, winds
obs_nudgezrampr2_uv 50 Vert infl ramp-to-zero height for LML obs, regime 2, winds
obs_nudgezfullr4_uv -5000 Vert infl full weight height for LML obs, regime 4, winds
obs_nudgezrampr4_uv 50 Vert infl ramp-to-zero height for LML obs, regime 4, winds
obs_nudgezfullr1_t 50 Vert infl full weight height for LML obs, regime 1, temperature
obs_nudgezrampr1_t 50 Vert infl ramp-to-zero height for LML obs, regime 1, temperature
obs_nudgezfullr2_t 50 Vert infl full weight height for LML obs, regime 2, temperature
]obs_nudgezrampr2_t 50 Vert infl ramp-to-zero height for LML obs, regime 2, temperature
obs_nudgezfullr4_t -5000 Vert infl full weight height for LML obs, regime 4, temperature
obs_nudgezrampr4_t 50 Vert infl ramp-to-zero height for LML obs, regime 4, temperature
obs_nudgezfullr1_q 50 Vert infl full weight height for LML obs, regime 1, moisture
obs_nudgezrampr1_q 50 Vert infl ramp-to-zero height for LML obs, regime 1, moisture
obs_nudgezfullr2_q 50 Vert infl full weight height for LML obs, regime 2, moisture
obs_nudgezrampr2_q 50 Vert infl ramp-to-zero height for LML obs, regime 2, moisture
obs_nudgezfullr4_q -5000 Vert infl full weight height for LML obs, regime 4, moisture
obs_nudgezrampr4_q 50 Vert infl ramp-to-zero height for LML obs, regime 4, moisture
obs_nudgezfullmin 50 Min depth through which vertical infl fcn remains 1.0
obs_nudgezrampmin 50 Min depth (m) through which vert infl fcn decreases from 1 to 0
obs_nudgezmax 3000 Max depth (m) in which vert infl function is nonzero
obs_sfcfact 1.0 Scale factor applied to time window for surface obs
obs_sfcfacr 1.0 Scale factor applied to horiz radius of influence for surface obs
obs_dpsmx 7.5 Max pressure change (cb) allowed within horiz radius of influence

 

&scm
scm_force 1 switch for single column forcing (=0 off)
scm_force_dx 4000 DX for SCM forcing (in meters)
num_force_layers 8 number of SCM input forcing layers
scm_lu_index 2 SCM landuse category (2 is dryland, cropland and pasture)
scm_isltyp 4 SCM soil category (4 is silt loam)
scm_vegfra 0.5 SCM vegetation fraction
scm_canwat 0.0 SCM canopy water
scm_lat 37.600 SCM latitude
scm_lon -96.700 SCM longitude
scm_th_adv .true. turn on theta advection in SCM
scm_wind_adv .true. turn on wind advection in SCM
scm_qv_adv .true. turn on moisture advection in SCM
scm_vert_adv .true. turn on vertical advection in SCM
&dynamics Diffusion, damping, advection options
rk_ord 3 time-integration scheme option:
2 = Runge-Kutta 2nd order
3 = Runge-Kutta 3rd order (recommended)
diff_opt turbulence and mixing option:
0 No turbulence or explicit spatial numerical filters (km_opt IS IGNORED).
1 1 = evaluates 2nd order diffusion term on coordinate surfaces.
uses kvdif for vertical diff unless PBL option is used. may be used with km_opt = 1 and 4. (= 1, recommended for real-data cases)
2 evaluates mixing terms in physical space (stress form) (x,y,z). turbulence parameterization is chosen by specifying km_opt.
km_opt eddy coefficient option
1 Constant: K is specified by namelist values for horizontal and vertical diffusion.(use khdif and kvdif)
2 1.5 order TKE closure (3D)
3 Smagorinsky first order closure (3D) Note: option 2 and 3 are not recommended for DX > 2 km
4 Horizontal Smagorinsky first order closure (recommended for real-data case). K for horizontal diffusion is diagnosed from just horizontal deformation. The vertical diffusion is assumed to be done by the PBL scheme (2D)
diff_6th_opt (max_dom) 0 6th-order numerical diffusion
0 = no 6th-order diffusion (default)
1 = 6th-order numerical diffusion
2 = 6th-order numerical diffusion but prohibit up-gradient diffusion
diff_6th_factor (max_dom) 0.12 6th-order numerical diffusion non-dimensional rate (max value 1.0 corresponds to complete removal of 2dx wave in one timestep)
damp_opt upper level damping flag
0 without damping
1 with diffusive damping (dampcoef nondimensional ~ 0.01 – 0.1. May be used for real-data runs)
2 with Rayleigh damping (dampcoef inverse time scale [1/s], e.g. 0.003)
3 with w-Rayleigh damping (dampcoef inverse time scale [1/s] e.g. 0.2; for real-data cases)
zdamp (max_dom) 5000 damping depth (m) from model top
dampcoef (max_dom) 0. damping coefficient (see damp_opt)
w_damping vertical velocity damping flag (for operational use)
0 without damping
1 with damping
base_pres 100000. Base state surface pressure (Pa), real only. Do not change.
base_temp 290. Base state sea level temperature (K), real only.
base_lapse 50. real-data ONLY, lapse rate (K), DO NOT CHANGE.
iso_temp 0 real-data, em ONLY, reference temp in stratosphere
khdif (max_dom) 0 horizontal diffusion constant (m^2/s)
kvdif (max_dom) 0 vertical diffusion constant (m^2/s)
smdiv (max_dom) 0.1 divergence damping (0.1 is typical)
emdiv (max_dom) 0.01 external-mode filter coef for mass coordinate model (0.01 is typical for real-data cases)
epssm (max_dom) .1 time off-centering for vertical sound waves
non_hydrostatic (max_dom) .true. whether running the model in hydrostatic or non-hydro mode
pert_coriolis (max_dom) .false. Coriolis only acts on wind perturbation (idealized)
top_lid (max_dom) .false. Zero vertical motion at top of domain
mix_full_fields (max_dom) .false. For diff_opt=2 only, vertical diffusion acts on full fields (not just on perturbation from 1D base_ profile) (idealized)
mix_isotropic (max_dom) 0 0=anistropic vertical/horizontal diffusion coeffs, 1=isotropic
mix_upper_bound (max_dom) 0.1 non-dimensional upper limit for diffusion coeffs
h_mom_adv_order (max_dom) 5 horizontal momentum advection order (5=5th, etc.)
v_mom_adv_order (max_dom) 3 vertical momentum advection order
h_sca_adv_order (max_dom) 5 horizontal scalar advection order
v_sca_adv_order (max_dom) 3 vertical scalar advection order
time_step_sound (max_dom) 4 number of sound steps per time-step (if using a time_step much larger than 6*dx (in km), increase number of sound steps). = 0: the value computed automatically
—advection options for scalar variables: 0=simple, 1=positive definite, 2=monotonic
moist_adv_opt (max_dom) 1 for moisture
scalar_adv_opt (max_dom) 1 for scalars
chem_adv_opt (max_dom) 1 for chem variables
tracer_adv_opt (max_dom) 1 for tracer variables (WRF-Chem activated)
tke_adv_opt (max_dom) 1 for tke
time_step_sound (max_dom) 4 divided by number of sound steps per time-step (0=set automatically) (if using a time_step much larger than 6*dx (in km),
proportionally increase number of sound steps – also best to use even numbers)
do_avgflx_em (max_dom) 0 whether to output time-averaged mass-coupled advective velocities
0 = no (default) 1 = yes
do_avgflx_cugd (max_dom) 0 whether to output time-averaged convective mass-fluxes from Grell-Devenyi ensemble scheme
0 = no (default)
1 = yes (only takes effect if do_avgflx_em=1 and cu_physics= 3
do_coriolis (max_dom) .true. whether to do Coriolis calculations (idealized) (inactive)
do_curvature (max_dom) .true. whether to do curvature calculations (idealized) (inactive)
do_gradp (max_dom) .true. whether to do horizontal pressure gradient calculations (idealized) (inactive)
fft_filter_lat 45 the latitude above which the polar filter is turned on
gwd_opt 0 for running without gravity wave drag
1 for running the WRF-ARW with its gravity wave drag
2 for running the WRF-NMM with its gravity wave drag
sfs_opt (max_dom) 0 nonlinear backscatter and anisotropy (NBA) off
1 NBA1 using diagnostic stress terms (km_opt=2,3 for scalars)
2 NBA2 using tke-based stress terms (km_opt=2 needed)
m_opt (max_dom) 0 no added output
1 adds output of Mij stress terms when NBA is not used
tracer_opt (max_dom) 0

 

&bdy_control boundary condition control
spec_bdy_width 5 total number of rows for specified boundary value nudging
spec_zone 1 number of points in specified zone (spec b.c. option)
relax_zone 4 number of points in relaxation zone (spec b.c. option)
specified (max_dom) .false. specified boundary conditions (only can be used for to domain 1)
The above 4 namelists are used for real-data runs only
spec_exp 0 exponential multiplier for relaxation zone ramp for specified=.t.
(0.=linear ramp default, e.g. 0.33=~3*dx exp decay factor)
constant_bc .false. constant boundary condition used with DFI
periodic_x (max_dom) .false. periodic boundary conditions in x direction
symmetric_xs (max_dom) .false. symmetric boundary conditions at x start (west)
symmetric_xe (max_dom) .false. symmetric boundary conditions at x end (east)
open_xs (max_dom) .false. open boundary conditions at x start (west)
open_xe (max_dom) .false. open boundary conditions at x end (east)
periodic_y (max_dom) .false. periodic boundary conditions in y direction
symmetric_ys (max_dom) .false. symmetric boundary conditions at y start (south)
symmetric_ye (max_dom) .false. symmetric boundary conditions at y end (north)
open_ys (max_dom) .false. open boundary conditions at y start (south)
open_ye (max_dom) .false. open boundary conditions at y end (north)
nested (max_dom) .false. nested boundary conditions (must be set to .true. for nests)
polar .false. polar boundary condition (v=0 at polarward-most v-point)
euler_adv .false. conservative Eulerian passive advection (NMM only)
idtadt 1 fundamental timesteps between calls to Euler advection, dynamics (NMM only)
idtadc 1 fundamental timesteps between calls to Euler advection, chemistry (NMM only)

 

&tc controls for tc_em.exe ONLY, no impact on real, ndown, or model
insert_bogus_storm .false. T/F for inserting a bogus tropical storm (TC)
remove_storm .false. T/F for only removing the original TC
num_storm 1 Number of bogus TC
latc_loc -999. center latitude of the bogus TC
lonc_loc -999. center longitude of the bogus TC
vmax_meters_per_second -999. vmax of bogus storm in meters per second
rmax -999. maximum radius outward from storm center
vmax_ratio -999. ratio for representative maximum winds, 0.75 for 45 km grid, and 0.9 for 15 km grid.
&namelist_quilt Option for async I/O for MPI apps
nio_tasks_per_group 0 default value is 0: no quilting; > 0 quilting I/O
nio_groups 1 default 1

 

&grib2 Grib2
background_proc_id 255 Background generating process identifier, typically defined by the originating center to identify the background data that was used in creating the data. This is octet 13 of Section 4 in the grib2 message
forecast_proc_id 255 Analysis or generating forecast process identifier, typically defined by the originating center to identify the forecast process that was used to generate the data. This is octet 14 of Section 4 in the grib2 message
production_status 255 Production status of processed data in the grib2 message. See Code Table 1.3 of the grib2 manual. This is octet 20 of Section 1 in the grib2 record
compression 40 The compression method to encode the output grib2 message. Only 40 for jpeg2000 or 41 for PNG are supported

 

 

 

 

 

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