WRF model tar file has been updated to Version
2.2 on December 22, 2006.
A new WRF Pre-Processing System (WPS) is introduced
in V2.2. This replaces funcstions of SI.
The V2.2 WRF is backward compatible with SI
and V2.1 real/ideal output. One must add two new namelist
records (&fdda and &grib2) to your namelist.input
file from previous releases (see namelist.input.* files in test/em_real/
directory for an example).
Note, wrfinput_d01 and wrfbdy_d01
from V2.2 cannot be used in previous releases of WRF.
Also see 'Known
Problems' in this release. If you are interested in seeing
how V2.2 has been tested, click here.
In this new tar file, the following bug fixes
and updates are provided:
namelist.input:
Two new namelist records are added:
&fdda
&grib2
One must add these in your old namelist.input
file to avoid namelist read error. The order does not matter.
Physics:
New in this release:
- CAM long- and short-wave radiation scheme (note that these options must be used together for now).
- Urban
canopy model coupled with Noah LSM.
- Thompson microphysics scheme (this is a difference one from
the one in 2.1).
PBL:
- YSU: minor correction to make the scheme stable
(problem posted for 2.1.2). Use frictional velocity calculated
from surface layer routine instead of recalculating in the scheme.
Change asypmtotic length scale for mixing, rlam, from 150 to 30
to reduce free atmosphere diffusion.
- MYJ: mass-weighting used in vertical exchange and other updates
for consistency with the operational NAM implementation in June
2006.
Surface layer physics:
- MYJSFC: roughness length refinement and various
updates for consistency with the operational NAM implementation
in June 2006.
Land surface physics:
- RUC LSM: minor update. May use more than 6
soil layers. Improved initialization from NAM data.
- Noah LSM: improved initialization from RUC data.
- LANDUSE.TBL: some changes to albedo values for winter season.
Microphysics
- WSM3,5 and 6 schemes: improvement on ice and
graupel physics. Snowfall diagnostics enabled.
- WSM5: performance improvement. Will change result within roundoff.
- Ferrier: updated parameters to be consistent with the operational
NAM implementation in June 2006. Improved interaction with ARW
radiation options (cloud effect).
Cumulus schemes:
- Grell-Devenyi scheme: significant update.
Improved results over water and over night. Improved interaction
with GFDL radiation option.
- BMJ: updated code to be consistent with the operational NAM
implementation in June 2006, including several bug fixes.
Atmospheric radiation:
- Dudhia sw radiation: add a runtime (namelist)
parameter, swrad_scat, for tuning clear-sky shortwave scattering.
- GFDL radiation: updated code to be consistent with the operational
NAM implementation in June 2006, as well as: 1) changed optical
properties of ice to include the sum of cloud ice and snow; 2)
saved convective cloud base and top values used by radiation;
3) different saturation vapor pressure calculations are used when
running ETAMPNEW (or Ferrier) versus other microphysics pachages.
Nudging Options: (new in V2.2)
- Three-dimensional grid analysis nudging (contributed
by PSU) (details)
- Observation nudging (contributed by NCAR/RAL) (details)
Dynamics/Diffusion/Filter Options:
- Positive definite advection scheme for moisture,
scalar, tke and chemical variables. Works under RSL_LITE and OpenMP.
- 6th order horizontal diffusion option, working in conjunction
with diff_opt, km_opt (contributed by G. Bryan and J. Knievel
of NCAR).
- Top atmospheric damping option adapted for real-data case with
specified and nested boundary conditions.
- Improved advection accuracy near boundaries.
- bug fix for tke buoyancy term for surface fluxes, and tke shear
term.
Initialization/Nesting/Restart
- Program real updated to include vertical
interpolation function for new WRF Pre-Processing System data.
- real recognizes ECMWF soil layers.
- bug fix for processing sibling domains in real.
- bug fix for generating nest initial and boundary condition files
if the nest ratio is even.
- a correction in ndown to work with any integer nest
ratio (problem posted for 2.1.2)
- nest input file name changed from 'wrf_real_input_em.d0*.*'
to 'wrfndi_d0*'.
- a correction for the weighting in the nest blending zone (problem
posted for 2.1.2)
- blend_width is now a runtime option. The default value is 5.
- a few improvements and bug fixes for automatic moving nest:
restart, moving more than one domain and radiation calculation.
Software:
New Features:
- ESMF component support (experimental, currently
works with ESMF 2.2.0rp1). Add a new test case called test/em_esmf_exp.
- ESMF clock utility modified to allow backward integration.
- Infrastructure streamlining: reduced reliance on Registry for
generating actual and dummy argument lists used in mediation layer.
- Added registry "include" and "ifdef" keywords.
Shared registry file declaration combined to a single file: registry.io_boilerplate.
- g95 support on Linux i486, i586, i686.
- Grib 1 and 2 for input and output. Do not use gribmap.txt if
the option is not used (contributed by Todd Hutchinson of WSI).
- Increase number of input and history streams from 5 to 9 each.
- Improved debug prints to contain domain and time information.
- Port to IBM Blue Gene (experimental)
- Parallel netcdf (Argonne Lab) I/O (experimental). Parallel netcdf
library must be installed separately. See http://www-unix.mcs.anl.gov/parallel-netcdf/.
- New time variable, XTIME, made available.
Fixes:
- RSL_LITE: Bug fix for double-precision (64-bit)
in MPI runs.
- RSL: bug fix (problem posted in 2.1.2).
- ESMF time function can be compiled with lower version of PGI
compiler (problem posted for 2.1.2).
- netcdf I/O: add new metadata for mapping in GIS.
- remove unnecessary dimension 'ext_scalar' in netcdf I/O. V2.2
WRF will read netcdf data with or without this dimension, but
will only write data without it. Patches will be provided to assist
users who might want to use old WRF with new data.
- runtime option to write output files without colons.
- support metadata puts of logicals through quilting.
Known Problems
In WRF V2.2
Previous Update
WRF V2.1.2.
WRF V2.1.1.
WRF V2.1.
WRF V2.0.
