Mesoscale Parallel Experiment Change Log

Experiment Name:  North American WRF-NMM

When Who What
2005/10/20/00 Janjic
  • Fixed an error in subroutine SFCDIF in which the first guess z0T is used to compute z+z0T instead of the converged value of z0T obtained iteratively.
    • 2005/10/05/12 Janjic
  • An change to DIFCOF in module_bl_myjpbl was made; this was inadvertently left out of the 12z 9/26 change to compute the PBL height in the same way as it is done in the ops NAM.
    • 2005/9/30/12 Ferrier
  • Fixed an error in module_cu_bmj which led to shallow convection being effectively bypassed. The cloud base/top arrays were not changed in accordance with bypassing the shallow convection branch, so it looked as though shallow convection was perpetually on over the oceans even though the temperature & moisture tendencies were zero. Additional code was also modified to set the cloud arrays to values consistent with shallow convection being absent. Without this change, shallow layers less than PONE (10 mb) thick would look as though convection was active, when it really is not.
    • 2005/9/23/12 Janjic
  • Modified module_bl_myjpbl to compute the PBL height in the same way as it is done in the ops NAM.
    • 2005/9/15/12 Ferrier
  • Modified module_radiation_driver so that it skipped code that should not run when using the GDFL radiation. This code block, when run in the NMM, would re-calculate (and reduce) the the downward solar flux and also re-calculated the total downward longwave flux
  • Revert back to 7 July change to RADFS: the downward solar fluxes in RADFS are obtained from the array DF rather than as a sum of the four components - i.e., direct visible and near-IR and diffuse visible and near-IR components, represented by the GDFxx arrays.
    • 2005/9/9/00 Ek, Mitchell, Wong
  • Replaced land-sfc code (module_lsm_nmm) with version 2.7.1 of the Noah LSM (identical to ops NAM)
    • 2005/8/30/12 Rogers, Pyle
  • Fixed bug in TURBL in which SNOW and SICE was multipled by 1000 at NTSD=0. This code fragment was commented out in the V1.3 and V2.0 runs but was inadvertently restored in the V2.1 parallel on 8/19.
  • Restarted cycle from ops NAM
    • 2005/8/30/00 Gayno, Janjic, Mitchell, Wu
  • Switch to using ops NAM roughness length
  • Included fixes to module_bl_myjpbl and module_sf_myjsfc to include cloud water in moist turbulence calculations
  • Switched to use 16 August version of GSI; no significant differences
    • 2005/8/26/00 Janjic
  • 12z 8/22 change to SFCDIF (remove countergradient correction by setting CT=0) inadvertently changed CZIL back to 0.2. It has been set to 0.1 as originally intended.
    • 2005/8/25/00 Ferrier, Pyle
  • Modified dyn_nmm/start_domain_nmm.F to only define Z0 if RESTRT=FALSE, so that the cycled Z0 during the NDAS is not continually increased by 1/2 of the veg component of Z0 at the start of every forecast w/RESTRT=TRUE
  • Defined downward shortwave sfc flux in RADFS to be the sum of the direct beam solar component ("beam"-B) and diffuse solar component ("diffuse"-D) of the mainline visible band (V) and near-IR (N) visible band, as is done in the ops NAM.
  • Modifications to cloud physics parameters T_ICE (old=-30, new=-10) and RHgrd (old=1.0, new=.97664) to make them identical to ops NAM
  • Restarted cycle from ops NDAS.
    • 2005/8/22/12 Janjic
  • Further modifications to BMJ convection to make all parameters identical to ops NAM
  • Removed countergradient correction in SFCDIF by setting CT=0 (same as ops NAM)
    • 2005/8/19/12 Black, Chuang, Ek, Janjic, Mitchell, Pyle, Rogers
  • Switch to V2.1 WRF-NMM repository code with cloud cover/radiation changes from 3 May 2005 ops NAM implmenetation. Changes in this run to the repository code:
    1. Modifications to BMJ convection detailed in 00z 8/12/05 entry
    2. CZIL=0.1 in module_sf_mkjsfc.F (same as ops NAM)
    3. NMM land-sfc module modified to use same soil parameter tables as ops NAM
    4. The diurnal variation of surface albedos over land have been restored in the GFDL radiation package (same as ops NAM)
    5. NMM land-sfc module modified to read in downward solar flux instead of net solar flux, with the net solar flux (with diurnal albedo variation removed) computed internally in the NMM_LSM module (same as ops NAM).
    6. Cycle restarted from Ops NAM/NDAS
    • 2005/8/12/00 Janjic, Pyle
  • Changes to BMJ convection parameterization:
    1. Eliminate the initial entropy check on the work of the buoyancy (the EPSNTT check)
    2. Set FUP = 0.0 (eliminates entrainment)
  • Cycle restarted from Ops NAM/NDAS
    • 2005/8/11/12 Rogers, Pyle
  • Forecast model switched to WRF-NMM version 2 code, based on late June/early July WRF respository version from Tom with the following modifications taken from the V1.3 parallel:
    1. The diurnal variation of surface albedos over land have been removed from the GFDL radiation package
    2. NMM land-sfc module modified to use correct soil parameter tables
    3. Fixed a sign error for the soil heat flux; it should have been multiplied by -1 in SFLX (in "module_sf_lsm_nmm.F") to maintain sign consistency with the NAM-Eta.
    • 2005/8/5/00 Wu
  • Set qoption=1, use specific humidity as moisture variable instead of normalized RH due to feedback problems with convective precipitation during the NDAS.
  • Restart cycled NDAS from ops NAM.
    • 2005/7/13/00 Ek
  • Fixed a sign error for the soil heat flux; it should have been multiplied by -1 in SFLX (in "module_sf_lsm_nmm.F") to maintain sign consistency with the NAM-Eta.
    • 2005/7/12/12 Wu
  • Change to GSI analysis: Increase the vertical scales to extend the influence area of the humidity observations and decrease the possibility of changing the humidity to keep the RH. (done inside background error stats). Reason: see 00z 7/11/2005 entry.
    • 2005/7/11/00 Wu
  • Change to GSI analysis: Increased the ob error for sfc temp until a better forward model is available ; done though ob error table. Reason: Problems with the interaction of the small vertical structure in NMM background error and the normalized RH as analysis variable.

    The vertical scales of the NMM background error are much smaller than those of the global stats. The NMM stats allow the analysis to draw closer to the surface temperature. At some places that means strong heating near the surface and very strong convection and so cooling in the lower atmosphere. In next analysis cycle GSI will try to warm up the lower atmosphere. The normalized RH then will act to keep the RH and increase the humidity in the area which will feed back to the convection...

    • 2005/7/9/00 Wu, Parrish
  • Changes to GSI analysis:
      Revert back to using background error calculated from NMM forecasts.
    1. Resume use of normalized relative humidity as analysis variable
    2. Variable "PINT" now updated with analysis surface pressure in analysis, necessary for 00-h surface pressure to be posted and for 00-h geopotental heights to be computed using the analysis surface pressure
    • 2005/7/7/00 Ferrier
  • The downward solar fluxes in RADFS are obtained from the array DF rather than as a sum of the four components - i.e., direct visible and near-IR and diffuse visible and near-IR components, represented by the GDFxx arrays.
    • 2005/6/30/00 Ek, Ferrier
  • The diurnal variation of surface albedos over land have been removed from the GFDL radiation package, similar to the other solar radiation packages in WRF V1.3.
  • NMM land-sfc module modified to use correct soil parameter tables
    • 2005/6/25/00 Wu
  • GSI analysis reverts back to using background errors derived from GFS forecasts.
  • GSI analysis reverts back to using specific humidity as the analysis variable.
    • 2005/6/22/00 (approx) Ferrier, Pyle
  • Removed "fix" to land-sfc scheme in which the net solar radiation was being passed to the land-sfc physics instead of the downward shortwave flux at the sfc; revert back to using the allegedly incorrect instantaneous downward shortwave flux
    • 2005/06/18 Wu
  • Changes to GSI analysis:
    1. Using background error calculated from NMM forecasts. For application to the whole NA domain, sin(lat) is separated from the balance projection and the projection matrix re-calculated.
    2. turn on qoption=2; EC's normalized relative humidity as analysis variable.
    3. turn off SSM/I total precipitable water; both from the script above and in the errtable.
    4. update to the latest GSI release. (20050609 by Russ T.)
    • 2005/06/09 Pyle, Rogers, Gayno
  • Topography used in WRF-SI run which cold-starts the cycled NMM was changed to be consistent with the "Eta-like" topography used in the code which extracts ops NDAS land states and insertes them into the WRF-NMM restart file prior to the start of each NMM cycle.

    • Page Last Modified: September 15, 2005