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WRF Model Version 3.5.1: UPDATES

WRF Model Update

The WRF model tar file has been updated to Version 3.5.1 on Sept 23, 2013. For known problems in V3.5.1, please click here.

The WRF Pre-Processing System (WPS) has been updated to Version 3.5.1.

Note: V3.5 and V3.5.1 WRF can use wrfinput and wrfbdy files from earlier V3 versions only if one sets iso_temp = 0 K in namelist &dynamics and this is necessary if one doesn't use this namelist already. If one uses this option already, please leave it in. This is important as the default value for iso_temp has been changed from 0 to 200 K in V3.5.

If you are interested in seeing how V3.5.1 has been tested, click here.

Improvements and Bug fixes in Version 3.5.1:


Land surface models and surface layer physics:

- CLM4: fix 2 m water vapor diagnostics; fix for use of this option with CAM radiation option
- RUC LSM: improved 2 m Qv
- Noah: fix for a sudden jump in 2m Qv due to abrupt change in exchange coefficient
- NoahMP: correct a problem with warm air or warm soil temp on permanent ice grid point. MPTABLE.TBL is updated to make stem area index (SAI) consistent with leaf area index (LAI). This could result some improvement in simulated surface temp (e.g. over cropland).
- Surface layer physics option 1 and 11 (MM5 scheme): Recode Garratt formula. The formula gives nearly identical results (Thanks to B. Green of PSU).
- Surface layer physics option 11 (revised MM5 scheme): match Donelan formula for drag coefficient to that in option 1.
- Extend fractional seaice option to QNSE surface layer scheme (Thanks to E. Tastula of Univ of Southern Florida).
- MYNN surface layer option: improved 2 m temp in unstable regime.

Deep and shallow cumulus options:

- Grell-Freitas ensemble scheme: fixes and improvement
- NSAS (cu_physics=14): fix for shallow ice clouds
- Tiedtke: index fix (no impact)
- Global/Regional Integrated Modeling System (GRIMS) shallow scheme : reduced mixing

PBL options:

- ACM2 PBL scheme is now coupled with WRF-Chem.
- YSU PBL: prevent large negative Ri in unstable regime (which could potentially cause model blowup over high terrain)
- TEMF: fix for surface heat and moisture conservation, robustness improvement, code cleanup
- MYNN PBL: Added a new fog scheme provided by Genki Katata of Japan, which is controlled by option grav_settling = 2.


- Thompson: coupling to RRTMG radiation scheme: modifying cloud optical path to use information from Thompson scheme. There is no switch for this change, and it is the default behavior if these options are used together.
- Morrison: 1) added output for snow+cloud ice and graupel time step and accumulated surface precipitation. 2) bug fix to option w/o graupel/hail (IGRAUP = 1), include PRACI, PGSACW, and PGRACS as sources for snow instead of graupel/hail (bug reported by Hailong Wang, PNNL). 3) very minor fix to immersion freezing rate formulation (negligible impact). 4) clarifications to code comments. 5) minor change to shedding of rain, remove limit so that the number of collected drops can smaller than number of shed drops. 6) change of specific heat of liquid water from 4218 to 4187 J/kg/K.

Radiaton options:

- Interpolation of short-wave radiation is added based on the updated solar zenith angle between SW calls. It must be activated in the namelist with the new physics option swint_opt. This option is being included as a global attribute of the wrfout so the user knows whether it was used or not. This change applies to all short-wave options.
- Computation of cosine of solar zenith angle (sza) was wrapped in a single function so it will make easy to centralize and homogeneize all these computations in future updates. Equation of time correction was included in the sza computations.
- Three additional variables are now output from all shortwave radiation options (note the output from RRTMG, new Goddard are directly from the routine, and hence more accurate; output from other options are estimates):

swddir: All-sky broadband surface direct horizontal irradiance
swddni: All-sky broadband surface direct normal irradiance
swddif: All-sky braodband surface diffuse irradiance

(Thanks to Jose Ruiz-Arias, U Jaen, Spain for the above)


- obs_nudging: regime calculation depends on surface layer option rather than PBL option


- seaice_threshold option: the default value for this variable is now set to 100 K. If you don't have any seaice data in the input, and you have some cold SST in your domain, set this namelist value to 271 so cold sea surface will be initialized as seaice points.
- real: if one uses smooth_cg_topo option, the effect is now extended to all boundary conditions.
- ndown: model run after ndown is now able to use microphysics and scalar variables in boundary condition file which was added in 3.5. One needs to use these options in &bdy_control to turn it on: have_bcs_moist and have_bcs_scalar = .true. It is recommended that the same mp options in both model runs are used so that correct boundary conditions for the same variables can be applied.
- restart: if one wants to change IO frequencies in a restart run, one must use additional namelist override_restart_timers = .true..


- Now there is only a single masked interpolation scheme that is used: interp_mask_field. This single scheme makes maintenance easier and insures consistency with land and water fields. The original interpolation subroutines were not removed from share/interp_fcn.F. The iswater or isice flag is supplied in the call from the Registry.EM_COMMON, so there are no problems with trying to internally determine what field is being interpolated, and whether the mask should be based on ice or water.
- Fixes for compile problem associated with IBM compilers.
- Minor changes for FX10 support (Thanks to Fujitsu)
Cray/PGI option added back.
- Fix for errors (seg faults) traversing linked list of statevars in
frame/module_domain.F. Errors occur occasionally because of uninitialized data in the head of the linked-list, which shouldn't be part of the traversal. This is a bug in the WRF code in general and would affect any users who use the "Run time control of IO stream variable sets" facility described in README.io_config (posted since 5/29/2013).


Previous Update

WRF V3.0.1
WRF V3.0.1.1


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