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WRF-NMM Model Version 3.2 (March 31, 2010) | ||
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---------------------------- | ||
WRF-NMM PUBLIC DOMAIN NOTICE | ||
---------------------------- | ||
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WRF-NMM was developed at National Centers for | ||
Environmental Prediction (NCEP), which is part of | ||
NOAA's National Weather Service. As a government | ||
entity, NCEP makes no proprietary claims, either | ||
statutory or otherwise, to this version and release of | ||
WRF-NMM and consider WRF-NMM to be in the public | ||
domain for use by any person or entity for any purpose | ||
without any fee or charge. NCEP requests that any WRF | ||
user include this notice on any partial or full copies | ||
of WRF-NMM. WRF-NMM is provided on an "AS IS" basis | ||
and any warranties, either express or implied, | ||
including but not limited to implied warranties of | ||
non-infringement, originality, merchantability and | ||
fitness for a particular purpose, are disclaimed. In | ||
no event shall NOAA, NWS or NCEP be liable for any | ||
damages, whatsoever, whether direct, indirect, | ||
consequential or special, that arise out of or in | ||
connection with the access, use or performance of | ||
WRF-NMM, including infringement actions. | ||
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================================================ | ||
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V3 Release Notes: | ||
----------------- | ||
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This is the main directory for the WRF Version 3 source code release. | ||
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- For directions on compiling WRF for NMM, see below or the | ||
WRF-NMM Users' Web page (http://www.dtcenter.org/wrf-nmm/users/) | ||
- Read the README.namelist file in the run/ directory (or on | ||
the WRF-NMM Users' page), and make changes carefully. | ||
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For questions, send mail to wrfhelp@ucar.edu | ||
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Release Notes: | ||
------------------- | ||
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Version 3.2 is released on March 31, 2010. | ||
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- For more information on WRF V3.2 release, visit WRF-NMM Users home page | ||
http://www.dtcenter.org/wrf-nmm/users/, and read the online User's Guide. | ||
- WRF V3 executable will work with V3.1 wrfinput/wrfbdy. As | ||
always, rerunning the new programs is recommended. | ||
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The Online User's Guide has also been updated. | ||
================================================ | ||
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The ./compile script at the top level allows for easy selection of | ||
NMM and ARW cores of WRF at compile time. | ||
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- Specify your WRF-NMM option by setting the appropriate environment variable: | ||
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setenv WRF_NMM_CORE 1 | ||
setenv WRF_NMM_NEST 1 (if nesting capability is desired) | ||
setenv HWRF 1 (if HWRF coupling/physics are desired) | ||
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- The Registry files for NMM and ARW are not integrated | ||
yet. There are separate versions: | ||
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Registry/Registry.NMM <-- for NMM | ||
Registry/Registry.NMM_NEST <-- for NMM with nesting | ||
Registry/Registry.EM <-- for ARW (formerly known as Eulerian Mass) | ||
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How to configure, compile and run? | ||
---------------------------------- | ||
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- In WRFV3 directory, type: | ||
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configure | ||
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this will create a configure.wrf file that has appropriate compile | ||
options for the supported computers. Edit your configure.wrf file as needed. | ||
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Note: WRF requires netCDF library. If your netCDF library is installed in | ||
some odd directory, set environment variable NETCDF before you type | ||
'configure'. For example: | ||
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setenv NETCDF /usr/local/lib32/r4i4 | ||
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- Type: | ||
compile nmm_real | ||
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- If sucessful, this command will create nmm_real.exe and wrf.exe | ||
in directory main/, and the appropriate executables will be linked into | ||
the run directories under test/nmm_real, or run/. | ||
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- cd to the appropriate test or run directory to run "nmm_real.exe" and "wrf.exe". | ||
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- Place files from WPS (met_nmm.*, geo_nmm_nest*) | ||
in the appropriate directory, type | ||
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real_nmm.exe | ||
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to produce wrfbdy_d01 and wrfinput_d01. Then type | ||
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wrf.exe | ||
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to run. | ||
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- If you use mpich, type | ||
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mpirun -np number-of-processors wrf.exe | ||
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============================================================================= | ||
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What is in WRF-NMM V3.2? | ||
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* Dynamics: | ||
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- The WRF-NMM model is a fully compressible, non-hydrostatic model with a | ||
hydrostatic option. | ||
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- Supports One-way and two-way static and moving nests. | ||
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- The terrain following hybrid pressure sigma vertical coordinate is used. | ||
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- The grid staggering is the Arakawa E-grid. | ||
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- The same time step is used for all terms. | ||
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- Time stepping: | ||
- Horizontally propagating fast-waves: Forward-backward scheme | ||
- Veryically propagating sound waves: Implicit scheme | ||
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- Advection (time): | ||
T,U,V: | ||
- Horizontal: The Adams-Bashforth scheme | ||
- Vertical: The Crank-Nicholson scheme | ||
TKE, water species: Forward, flux-corrected (called every two timesteps)/Eulerian, Adams-Bashforth | ||
and Crank-Nicholson with monotonization. | ||
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- Advection (space): | ||
T,U,V: | ||
- Horizontal: Energy and enstrophy conserving, | ||
quadratic conservative,second order | ||
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- Vertical: Quadratic conservative,second order, implicit | ||
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- Tracers (water species and TKE): upstream, positive definite, conservative antifiltering | ||
gradient restoration, optional, see next bullet. | ||
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- Tracers (water species, TKE, and test tracer rrw): Eulerian with monotonization, coupled with | ||
continuity equation, conservative, positive definite, monotone, optional. To turn on/off, set | ||
the logical switch "euler" in solve_nmm.F to .true./.false. The monotonization parameter | ||
steep in subroutine mono should be in the range 0.96-1.0. For most natural tracers steep=1. | ||
should be adequate. Smaller values of steep are recommended for idealizaed tests with very | ||
steep gradients. This option is available only with Ferrier microphysics. | ||
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- Horizontal diffusion: Forward, second order "Smagorinsky-type" | ||
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- Vertical Diffusion: | ||
See "Free atmosphere turbulence above surface layer" section | ||
in "Physics" section given in below. | ||
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- Added a new highly-conservative passive advection scheme to v3.2 | ||
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Added Operational Hurricane WRF (HWRF) components to v3.2. These enhancements include: | ||
- Vortex following moving nest for NMM | ||
- Ocean coupling (with POM) | ||
- Changes in diffusion coefficients | ||
- Modifications/additions to physics schemes (tuned for the tropics) | ||
- Updated existing SAS cumulus scheme | ||
- Updated existing GFS boundary layer scheme | ||
- Added new HWRF microphysics scheme - Added new HWRF radiation scheme | ||
Please see the WRF for Hurricanes webpage for more details: | ||
http://www.dtcenter.org/HurrWRF/users | ||
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* Physics: | ||
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- Explicit Microphysics: WRF Single Moment 5 and 6 class / | ||
Ferrier (Used operationally at NCEP.) / Thompson [a new version in 3.1] | ||
/ HWRF microphysics: (Used operationally at NCEP for HWRF) | ||
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- Cumulus parameterization: Kain-Fritsch with shallow convection / | ||
Betts-Miller-Janjic (Used operationally at NCEP.)/ Grell-Devenyi ensemble | ||
/ Simplified Arakawa-Schubert (Used operationally at NCEP for HWRF) | ||
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- Free atmosphere turbulence above surface layer: Mellor-Yamada-Janjic (Used operationally at NCEP.) | ||
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- Planetary boundary layer: YSU / Mellor-Yamada-Janjic (Used operationally at NCEP.) | ||
/ NCEP Global Forecast System scheme (Used operationally at NCEP for HWRF) | ||
/ GFS / Quasi-Normal Scale Elimination | ||
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- Surface layer: Similarity theory scheme with viscous sublayers | ||
over both solid surfaces and water points (Janjic - Used operatinally at NCEP). | ||
/ GFS / YSU / Quasi-Normal Scale Elimination / GFDL surface layer (Used operationally at NCEP for HWRF) | ||
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- Soil model: Noah land-surface model (4-level - Used operationally at NCEP) / | ||
RUC LSM (6-level) / GFDL slab model (Used operationally at NCEP for HWRF) | ||
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- Radiation: | ||
- Longwave radiation: GFDL Scheme (Fels-Schwarzkopf) (Used | ||
operationally at NCEP.) / Modified GFDL scheme (Used operationally | ||
at NCEP for HWRF) / RRTM | ||
- Shortwave radiation: GFDL-scheme (Lacis-Hansen) (Used operationally | ||
at NCEP.) / Modified GFDL shortwave (Used operationally at NCEP | ||
for HWRF)/ Dudhia | ||
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- Gravity wave drag with mountain wave blocking (Alpert; Kim and Arakawa) | ||
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- Sea Surface temperature updates during long simulations | ||
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* WRF Software: | ||
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- Hierarchical software architecture that insulates scientific code | ||
(Model Layer) from computer architecture (Driver Layer) | ||
- Multi-level parallelism supporting distributed-memory (MPI) | ||
- Active data registry: defines and manages model state fields, I/O, | ||
nesting, configuration, and numerous other aspects of WRF through a single file, | ||
called the Registry | ||
- Two-way nesting: | ||
Easy to extend: forcing and feedback of new fields specified by | ||
editing a single table in the Registry | ||
Efficient: 5-8% overhead on 64 processes of IBM | ||
- Enhanced I/O options: | ||
NetCDF and Parallel HDF5 formats | ||
Nine auxiliary input and history output streams separately controllable through the | ||
namelist | ||
Output file names and time-stamps specifiable through namelist | ||
- Efficient execution on a range of computing platforms: | ||
IBM SP systems, (e.g. NCAR "bluevista","blueice","bluefire" Power5-based system) | ||
IBM Blue Gene | ||
SGI Origin and Altix | ||
Linux/Intel | ||
IA64 MPP (HP Superdome, SGI Altix, NCSA Teragrid systems) | ||
IA64 SMP | ||
x86_64 (e.g. TACC's "Ranger", NOAA/GSD "wJet" ) | ||
PGI, Intel, Pathscale, gfortran, g95 compilers supported | ||
Sun Solaris (single threaded and SMP) | ||
Cray X1, X1e (vector), XT3/4 (Opteron) | ||
Mac Intel/ppc, PGI/ifort/g95 | ||
NEC SX/8 | ||
HP-UX | ||
Fujitsu VPP 5000 | ||
- RSL_LITE: communication layer, scalable to very large domains, supports nesting. | ||
- I/O: NetCDF, parallel NetCDF (Argonne), HDF5, GRIB, raw binary, Quilting (asynchronous I/O) | ||
, MCEL (coupling) | ||
- ESMF Time Management, including exact arithmetic for fractional | ||
time steps (no drift). | ||
- ESMF integration - WRF can be run as an ESMF component. | ||
- Improved documentation, both on-line (web based browsing tools) and in-line | ||
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(Model Layer) from computer architecture (Driver Layer) | ||
- Multi-level parallelism supporting shared-memory (OpenMP), distributed-memory (MPI), | ||
and hybrid share/distributed modes of execution | ||
- Serial compilation can be used for single-domain runs but not for runs with | ||
nesting at this time. | ||
- Active data registry: defines and manages model state fields, I/O, | ||
configuration, and numerous other aspects of WRF through a single file, | ||
called the Registry | ||
- Enhanced I/O options: | ||
NetCDF and Parallel HDF5 formats | ||
Five auxiliary history output streams separately controllable through the namelist | ||
Output file names and time-stamps specifiable through namelist | ||
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- Testing: Various regression tests are performed on HP/Compaq systems at | ||
NCAR/MMM whenever a change is introduced into WRF cores. | ||
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- Efficient execution on a range of computing platforms: | ||
IBM SP systems, (e.g. NCAR "bluevista","blueice" and NCEP's "blue", Power4-based system) | ||
HP/Compaq Alpha/OSF workstation, SMP, and MPP systems (e.g. Pittsburgh | ||
Supercomputing Center TCS) | ||
SGI Origin and Altix | ||
Linux/Intel | ||
IA64 MPP (HP Superdome, SGI Altix, NCSA Teragrid systems) | ||
IA64 SMP | ||
Pentium 3/4 SMP and SMP clusters (NOAA/FSL iJet system) | ||
PGI and Intel compilers supported | ||
Alpha Linux (NOAA/FSL Jet system) | ||
Sun Solaris (single threaded and SMP) | ||
Cray X1 | ||
HP-UX | ||
Other ports under development: | ||
NEC SX/6 | ||
Fujitsu VPP 5000 | ||
- RSL_LITE: communication layer, scalable to very | ||
large domains | ||
- ESMF Time Management, including exact arithmetic for fractional | ||
time steps (no drift); model start, stop, run length and I/O frequencies are | ||
now specified as times and time intervals | ||
- Improved documentation, both on-line (web based browsing tools) and in-line | ||
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-------------------------------------------------------------------------- |
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*** | ||
WRF-ARW v3.6.* coupled with SSiB v3.0 land-surface model | ||
*** | ||
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The SSiB v3.0 is a land-surface model with a multi-layer snow scheme. | ||
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---------- | ||
WRF | ||
---------- | ||
To run WRF-ARW with SSIB v3.0, set sf_surface_physics to 8 | ||
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Currently, the SSIB will only work with the following options: | ||
1) SW and LW radiation schemes: 1 or 3 | ||
2) Surface layer schemes: 1 | ||
3) PBL scheme: 1 | ||
4) Eta levels: the first level above ground must be equal or smaller than 0.982, | ||
to guarantee that the lowest layer is deep enough for SSIB. | ||
For example, for an e_vert=28 domain, the eta_levels may be set to: | ||
eta_levels = 1.000, 0.982, 0.973, 0.964, 0.946, | ||
0.922, 0.894, 0.860, 0.817, 0.766, | ||
0.707, 0.644, 0.576, 0.507, 0.444, | ||
0.380, 0.324, 0.273, 0.228, 0.188, | ||
0.152, 0.121, 0.093, 0.069, 0.048, | ||
0.029, 0.014, 0.000, | ||
5) num_soil_layers = 3 | ||
6) fractional_seaice = 1 | ||
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Since version 3.6.1, SSiB also provides 10-meter wind speed (U10 and V10) outputs. | ||
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---------- | ||
WPS | ||
---------- | ||
By default, SSiB will work with either USGS and MODIS land-use/vegetation maps, however, for better results, we suggest that you use the SSiB 12-type vegetation maps. | ||
These files are available in the WPS_GEOG directory. | ||
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This can be done by prefixing the variable geog_data_res with the string "ssib_+", according to the desired resolution. | ||
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For instance, to use the SSiB 10-minute resolution vegetation map, enter: | ||
geog_data_res = 'ssib_10m+10m' | ||
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Or to use the 5-minute resolution vegetation map, enter: | ||
geog_data_res = 'ssib_5m+5m' | ||
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Only 10-minute and 5-minute maps are currently available. | ||
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SSiB vegetation classification: | ||
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1 tropical rainforest | ||
2 broadleaf deciduous trees | ||
3 broadleaf and needleaf trees | ||
4 needleaf evergreen trees | ||
5 needleaf deciduous trees | ||
6 broadleaf trees with ground cover | ||
7 groundcover only | ||
8 broadleaf shrubs with ground cover | ||
9 broadleaf shrubs with bare soil | ||
10 dwarf trees with ground cover | ||
11 bare soil | ||
12 crops | ||
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** | ||
For further assistance please contact Dr. Yongkang Xue (yxue@geog.ucla.edu) or Dr. Fernando De Sales (fsales@geog.ucla.edu) | ||
** |
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