WRF NAMELIST.INPUT FILE DESCRIPTION
WRF NAMELIST.INPUT FILE DESCRIPTION
The namelist.input file is used for both the real.exe and wrf.exe executables. Within the file, multiple columns 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 |
||
| run_days |
1 |
run time in days |
| run_hours |
0 |
run time in hours |
| run_minutes |
0 |
run time in minutes |
|
0 |
run time in seconds |
|
|
2001 |
Four digit year of starting time |
|
|
06 |
Two digit month of starting time |
|
|
11 |
Two digit day of starting time |
|
|
12 |
Two digit hour of starting time |
|
|
00 |
Two digit minute of starting time |
|
|
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 |
|
|
2001 |
Four digit year of ending time |
|
|
06 |
Two digit month of ending time |
|
|
12 |
Two digit day of ending time |
|
|
12 |
Two digit hour of ending time |
|
|
00 |
Two digit minute of ending time |
|
|
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 by real.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. Program real.exe uses start and end times only. |
|
|
10800 |
time interval between incoming real data, which will be the interval between the lateral boundary condition file (for real only) |
|
|
.true. |
logical; whether nested run will have input files for domains other than 1 |
|
|
selected fields from nest input |
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|
0 |
all fields from nest input are used |
|
|
2 |
only nest input specified from input stream 2 (defined in the Registry) are used |
|
|
60 |
history output file interval in minutes (integer only) |
|
|
1 |
history output file interval in months (integer); used as alternative to history_interval |
|
|
1 |
history output file interval in days (integer); used as alternative to history_interval |
|
|
1 |
history output file interval in hours (integer); used as alternative to history_interval |
|
|
1 |
history output file interval in minutes (integer); used as alternative to history_interval and is equivalent to history_interval |
|
|
1 |
history output file interval in seconds (integer); used as alternative to history_interval |
|
|
1 |
output times per history output file, used to split output files into smaller pieces |
|
|
whether this run is a restart run |
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|
1440 |
restart output file interval in minutes |
|
|
input from WPS (this is the default): |
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|
2 |
1 = binary format (no supported post-processing software available) |
|
|
2 |
2 = netCDF; 102 = split netCDF files one per processor (must restart with the same number of processors) |
|
|
2 |
2 = NetCDF |
|
|
2 |
1 = binary format (no supported post-processing software) |
|
|
0 |
0,50,100,200,300 values give increasing prints |
|
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“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 |
||
|
10 |
interval in minutes |
|
|
2 |
output in netCDF |
|
|
nocolons |
.false. |
replace : with _ in output file names |
|
t |
write input-formatted data as output for 3DVAR application |
|
|
180 |
interval in minutes when writing input-formatted data |
|
|
Output file name from 3DVAR |
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|
0 |
beginning year to write 3DVAR data |
|
|
0 |
beginning month to write 3DVAR data |
|
|
0 |
beginning day to write 3DVAR data |
|
|
3 |
beginning hour to write 3DVAR data |
|
|
0 |
beginning minute to write 3DVAR data |
|
|
0 |
beginning second to write 3DVAR data |
|
|
0 |
ending year to write 3DVAR data |
|
|
0 |
ending month to write 3DVAR data |
|
|
0 |
ending day to write 3DVAR data |
|
|
12 |
ending hour to write 3DVAR data |
|
|
0 |
ending minute to write 3DVAR data |
|
|
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. |
|
domain def: dimensions, nesting params |
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|
60 |
time step for integration in integer seconds (recommended 6*dx in km for a typical case) |
|
|
0 |
numerator for fractional time step |
|
|
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 |
|
|
1 |
number of domains – set it to > 1 if it is a nested run |
|
|
1 |
start index in x (west-east) direction (leave as is) |
|
|
91 |
end index in x (west-east) direction (staggered dimension) |
|
|
1 |
start index in y (south-north) direction (leave as is) |
|
|
82 |
end index in y (south-north) direction (staggered dimension) |
|
|
1 |
start index in z (vertical) direction (leave as is) |
|
|
28 |
end index in z (vertical) direction (staggered dimension – this refers to full levels). Most variables are on unstaggered levels. Vertical dimensions need to be the same for all nests. |
|
|
40 |
number of vertical levels in the incoming data: type ncdump –h to find out (WPS data only) |
|
|
1.0..0.0 |
model eta levels (WPS data only). If a user does not specify this, real will provide a set of levels |
|
|
1 |
use surface data as lower boundary when interpolating through this many eta levels |
|
|
5000 |
p_top to use in the model |
|
|
1 |
vertical interpolation; 1: linear in pressure; 2: linear in log(pressure) |
|
|
1 |
vertical interpolation order; 1: linear; 2: quadratic |
|
|
.false. |
T = use surface values for the lowest eta (u,v,t,q); F = use traditional interpolation |
|
|
10000 |
grid length in x direction, unit in meters |
|
|
10000 |
grid length in y direction, unit in meters |
|
|
19000. |
used in mass model for idealized cases |
|
|
1 |
domain identifier |
|
|
0 |
id of the parent domain |
|
|
0 |
starting LLC I-indices from the parent domain |
|
|
0 |
starting LLC J-indices from the parent domain |
|
|
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. |
|
|
1 |
parent-to-nest time step ratio; it can be different from the parent_grid_ratio |
|
|
1 |
feedback from nest to its parent domain; 0 = no feedback |
|
|
0 |
smoothing option for parent domain, used only with feedback option on. |
|
|
Namelist variables for controlling the moving nest option: |
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|
2, |
total number of moves for all domains |
|
|
2,2, |
a list of nest domain id’s, one per move |
|
|
60,120 |
time in minutes since the start of this domain |
|
|
1,-1, |
the number of parent domain grid cells to move in i direction |
|
|
-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. |
|
|
15 |
how often the new vortex position is computed |
|
|
40 |
used to compute the search radius for the new vortex position |
|
|
8 |
how many coarse grid cells the moving nest is allowed to get near the coarse grid boundary |
|
|
0 |
number of points in tile x direction |
|
|
0 |
number of points in tile y direction can be determined automatically |
|
|
1 |
number of tiles per patch (alternative to above two items) |
|
|
-1 |
number of processors in x for decomposition |
|
|
-1 |
number of processors in y for decomposition -1: code will do automatic decomposition >1: for both: will be used for decomposition |
|
physics options |
||
|
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. |
|
|
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 |
|
|
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 |
|
|
1.e-8 |
critical value for moisture variable threshold, below which moist arrays (except for Qv) are set to zero (unit: kg/kg) |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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. |
|
|
30 |
minutes between radiation physics calls. Recommend 1 minute per km of dx (e.g. 10 for 10 km grid) |
|
|
1 |
CO2 transmission function flag for GFDL radiation only. Set it to 1 for ARW, which allows generation of CO2 function internally |
|
|
21600 |
CAM clearsky longwave absorption calculation frequency (recommended minimum value to speed scheme up) |
|
|
levsiz |
59 |
for CAM radiation input ozone levels |
|
29 |
for CAM radiation input aerosol levels |
|
|
cam_abs_dim1 |
4 |
for CAM absorption save array |
|
for CAM 2nd absorption save array |
||
|
surface-layer option |
||
|
0 = no surface-layer |
||
|
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) | |
|
boundary-layer option |
||
|
0 = no boundary-layer |
||
|
0 |
minutes between boundary-layer physics calls |
|
|
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 |
New Grell scheme (G3) |
|
|
99 |
previous Kain-Fritsch scheme |
|
|
0 |
minutes between cumulus physics calls. For example, 10.0 minutes. 0 = call every time step |
|
|
1 |
heat and moisture fluxes from the surface |
|
|
0 |
snow-cover effects (only works for sf_surface_physics = 1) |
|
|
1 |
cloud effect to the optical depth in radiation (only works for ra_sw_physics = 1 and ra_lw_physics = 1) |
|
|
swrat_scat |
1. |
Scattering tuning parameter (default 1 is 1.e-5 m2/kg) |
|
1,2 |
where landuse and soil category data come from |
|
|
number of soil layers in land surface model (set in real) |
||
|
0 |
activate urban canopy model (in Noah LSM only) (0=no, 1=yes) |
|
|
1 |
Grell-Devenyi only |
|
|
3 |
G-D only |
|
|
3 |
G-D only |
|
|
16 |
G-D only |
|
|
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. |
|
|
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 |
|
|
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 |
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for grid and obs nudging |
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|
1 |
grid-nudging on (=0 off) for each domain |
|
|
Defined name in real |
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|
360 |
Time interval (min) between analysis times |
|
|
6 |
Time (h) to stop nudging after start of forecast |
|
|
2 |
Analysis format (2 = netcdf) |
|
|
0 |
Calculation frequency (in minutes) for analysis nudging. |
|
|
0 |
0 = nudging in the pbl |
|
|
0 |
0 = nudging in the pbl |
|
|
0 |
0 = nudging in the pbl |
|
|
0 |
0 = nudge u and v all layers |
|
|
10 |
10 = model level below which nudging is switched off for u and v |
|
|
0 |
||
|
10 |
10 = model level below which nudging is switched off for temp |
|
|
0 |
||
|
10 |
10 = model level below which nudging is switched off for water qvapor |
|
|
0.0003 |
nudging coefficient for u and v (sec-1) |
|
|
0.0003 |
nudging coefficient for temp (sec-1) |
|
|
0.0003 |
nudging coefficient for qvapor (sec-1) |
|
|
0 |
0= nudging ends as a step function, 1= ramping nudging down at end of period |
|
|
60. |
time (min) for ramping function, 60.0=ramping starts at last analysis time, -60.0=ramping ends at last analysis time |
|
|
(for obs nudging) |
Observation nudging |
|
|
1 |
0 = obs-nudging fdda off |
|
|
150000 |
max number of observations used on a domain during any given time window |
|
|
0. |
obs nudging start time in minutes |
|
|
180. |
obs nudging end time in minutes |
|
|
1 |
whether to nudge wind: (=0 off) |
|
|
6.e-4 |
nudging coefficient for wind, unit: s-1 |
|
|
1 |
whether to nudge temperature: (=0 off) |
|
|
6.e-4 |
nudging coefficient for temp, unit: s-1 |
|
|
1 |
whether to nudge water vapor mixing ratio: (=0 off) |
|
|
6.e-4 |
nudging coefficient for water vapor mixing ratio, unit: s-1 |
|
|
0 |
whether to nudge surface pressure (not used) |
|
|
0. |
nudging coefficient for surface pressure, unit: s-1 (not used) |
|
|
200. |
horizontal radius of influence in km |
|
|
0.1 |
vertical radius of influence in eta |
|
|
0.6667 |
half-period time window over which an observation will be used for nudging; the unit is in hours |
|
|
10 |
freq in coarse grid timesteps for diag prints |
|
|
2 |
freq in coarse grid timesteps for obs input and err calc |
|
|
0 |
for dynamic initialization using a ramp-down function to gradually turn off the FDDA before the pure forecast (=1 on) |
|
|
40. |
time period in minutes over which the nudging is ramped down from one to zero. |
|
|
.true. |
print obs input diagnostics (=.false. off) |
|
|
.true. |
.false. = don’t print obs error diagnostics |
|
|
.true. |
.false. = don’t print obs nudge diagnostics |
|
Diffusion, damping, advection options |
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|
2 |
dynamical core option: advanced research WRF core (Eulerian mass) |
|
|
time-integration scheme option: |
||
|
turbulence and mixing option: |
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|
0 |
No turbulence or explicit spatial numerical filters (km_opt IS IGNORED). |
|
|
1 |
Simple diffusion: 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 case) |
|
|
2 |
Full diffusion: evaluates mixing terms in physical space (stress form) (x,y,z). turbulence parameterization is chosen by specifying km_opt. |
|
|
eddy coefficient option |
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|
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) |
|
|
0 |
6th-order numerical diffusion |
|
|
0.12 |
6th-order numerical diffusion non-dimensional rate (max value 1.0 corresponds to complete removal of 2dx wave in one timestep) |
|
|
upper level damping flag |
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|
0 |
without damping |
|
|
1 |
with diffusive damping (dampcoef nondimensional ~ 0.01 – 0.1. May be used for real-data runs) |
|
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2 |
with Rayleigh damping (dampcoef inverse time scale [1/s], e.g. 0.003) |
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|
3 |
with w-Rayleigh damping (dampcoef inverse time scale [1/s] e.g. 0.2; for real-data cases) |
|
|
5000 |
damping depth (m) from model top |
|
|
0. |
damping coefficient (see damp_opt) |
|
|
vertical velocity damping flag (for operational use) |
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|
0 |
without damping |
|
|
1 |
with damping |
|
|
100000. |
Base state surface pressure (Pa), real only. Do not change. |
|
|
290. |
Base state sea level temperature (K), real only. |
|
|
50. |
real-data ONLY, lapse rate (K), DO NOT CHANGE. |
|
|
0 |
horizontal diffusion constant (m^2/s) |
|
|
0 |
vertical diffusion constant (m^2/s) |
|
|
0.1 |
divergence damping (0.1 is typical) |
|
|
0.01 |
external-mode filter coef for mass coordinate model (0.01 is typical for real-data cases) |
|
|
.1 |
time off-centering for vertical sound waves |
|
|
.true. |
whether running the model in hydrostatic or non-hydro mode |
|
|
.false. |
Coriolis only acts on wind perturbation (idealized) |
|
|
.false. |
For diff_opt=2 only, vertical diffusion acts on full fields (not just on perturbation from 1D base_ profile) (idealized) |
|
|
5 |
horizontal momentum advection order (5=5th, etc.) |
|
|
3 |
vertical momentum advection order |
|
|
5 |
horizontal scalar advection order |
|
|
3 |
vertical scalar advection order |
|
|
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 |
|
|
.false. |
positive define advection of moisture; set to .true. to turn it on |
|
|
.false. |
positive define advection of scalars |
|
|
.false. |
positive define advection of tke |
|
|
.false. |
positive define advection of chem vars |
|
|
0 |
surface drag coefficient (Cd, dimensionless) for diff_opt=2 only |
|
|
0 |
surface thermal flux (H/rho*cp), K m/s) for diff_opt = 2 only |
|
boundary condition control |
||
|
5 |
total number of rows for specified boundary value nudging |
|
|
1 |
number of points in specified zone (spec b.c. option) |
|
|
4 |
number of points in relaxation zone (spec b.c. option) |
|
|
.false. |
specified boundary conditions (only can be used for to domain 1) |
|
|
The above 4 namelists are used for real-data runs only |
||
|
.false. |
periodic boundary conditions in x direction |
|
|
.false. |
symmetric boundary conditions at x start (west) |
|
|
.false. |
symmetric boundary conditions at x end (east) |
|
|
.false. |
open boundary conditions at x start (west) |
|
|
.false. |
open boundary conditions at x end (east) |
|
|
.false. |
periodic boundary conditions in y direction |
|
|
.false. |
symmetric boundary conditions at y start (south) |
|
|
.false. |
symmetric boundary conditions at y end (north) |
|
|
.false. |
open boundary conditions at y start (south) |
|
|
.false. |
open boundary conditions at y end (north) |
|
|
.false. |
nested boundary conditions (must be set to .true. for nests) |
|
Option for async I/O for MPI apps |
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|
0 |
default value is 0: no quilting; > 0 quilting I/O |
|
|
1 |
default 1 |
|
Grib2 |
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|
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 |
|
|
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 |
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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 |
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40 |
The compression method to encode the output grib2 message. Only 40 for jpeg2000 or 41 for PNG are supported |
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