WRF Model Update 2.1.1
WRF model tar file has been updated to Version
2.1.1 on November 8, 2005. In this new tar file, the following
bug fixes and updates are provided.
The SI and V2.1 real/ideal output are
OK to use for the new wrf.exe.
Also see 'Known
Problems' in this release.
Physics:
Surface layer physics:
- Bug fix: surface roughness length (znt) and
frictional velocity (ust) are not cycled to the next time step
over water. This leaves znt to have only a small default value
of 1.0e-4 m. The change will have significant impact on tropical
storm simulations - it will reduce wind speed, and decrease sea-level
pressure.
- Constant change: Values used for the Charnock constants are
changed to more standard ones: czo = 0.0185 and ozo = 1.59e-5.
Again, this only affect results over water area.
- Bug fixes for MYJ surface scheme.
Land-Surface models:
- In Noah LSM, the use of surface skin temperature
in the surface energy budget equation is replaced by the 2-m temperature,
consistant with Penman-Monteith potential evaporation calculation
which was linearized by using the skin temperature. This has a
general effect of increasing the amplitude of the diurnal cycle
(~ 0.5 to 2 K).
PBL:
- Changes for MYJ PBL: modifying computations
for PBL height, and add cloud water to the buoyancy term calculation
in MIXLEN.
Microphysics
- Bug fixes for Thompson scheme: Correction
for ice crystal diffusional rate, and error with collision kernals
for rain collecting snow and snow collecting rain.
- Efficiency improvement for WSM6.
Cumulus schemes:
- Bug fix for Betts-Miller-Janjic scheme.
Atmospheric radiation:
- GFDL radiation: clean-up and refinement.
- GSFC radiation: bug fix.
Diffusion/Filter Options:
- Fix for diff_opt = 1 with periodic boundary
conditions.
Nesting/Restart:
- Nesting boundary problem fixed. The interface
has been extended to 1 specified row/column (as before) and 4
rows/columns for relaxation zone, similar to that for the coarse
domain boundary. Terrain, base state mu and geopotential in the
boundary zone have the values from the coarse domain, and are
blended with the nest data from row/column 6 to 10.
- Bug fixes for interpolation routine for nesting.
- Bug fix for itimestep update in moving nest, which may cause
missing physics calls (such as atmospheric radiation because of
its dependency on itimestep).
- Missing nest output time problem fixed - this usually happens
at the end of a run.
- V2.1 had introduced some problem for restart, and it has been
fixed in this release.
- ndown segmention fault fixed.
- Center latitude and longitude calculation corrected for one-way
nesting via ndown.
Software:
- Restart with double-precision option is fixed in RSL and RSL_LITE.
- A problem associated with two or more nests when using RSL_LITE
is fixed.
- Output problem with using RSL_LITE and nest with smooth_option
= 1 is fixed.
- RCONFIG registry variables are no longer passed in through dummy
arguments; they are retrieved from GRID% or CONFIG_FLAGS%.
- Remove some redundance in time-keeping routines.
- Add periodic-in-X boundary condition support in RSL_LITE.
- GriB 1 output header fixed.
Download the Code
WRFV2.1.1
Known Problems
In WRF V2.1.1
Previous Update
WRF V2.1.
WRF V2.0.
