Mesoscale Parallel Experiment Change Log

Experiment Name:  North American WRF-NMM with various physics and/or analysis changes

When Who What
2007/11/29/00 Rogers
  • Due to system maintainence resulting in a 30-h outage on the development computer, NDASR was restarted from NDASY atmospheric/land states
  • 2007/11/26/18 Liu, Treadon, Wu
  • In the GSI analysis, fixed an error in how skin temperature variances are applied at water points. The application of the variances over water points in subroutine bkgvar was not correctly updated.
  • 2007/11/16/12 Treadon, Wu
  • Turned off assimilation of NOAA-18 AMSU-A channel 9 due to increased radiometric noise. Change implemented in operations at 18z 11/16
  • 2007/11/14/12 Pyle, Gayno
  • Minor modification to the model orography to ensure consistent smoothing at/near the model's lateral boundary. NDASRwas restarted from NDASY atmospheric/land states.
  • Fixed an error in the GSI analysis script (present since 10/23) which caused the global_angupdate code to fail, which prevented the satbias_angle file from being updated.
  • 2007/11/13/18 Wu, Rogers
  • Fixed an error in the GSI analysis script (present since 10/23) which caused the global_angupdate code to fail, which prevented the satbias_angle file from being updated.
  • 2007/11/01/18 Treadon, Wu
  • Turned off AQUA AMSU-A channel 4 due to increased radiometric noise.
  • 2007/10/29/18 Parrish
  • A GSI error involving rotation of wind obs from earth coordinates to NAM grid coordinates was fixed. This only impacts a small number of observations (aircraft and sat winds) that fall close to the date line (180E).
  • 2007/10/23/18 Rogers
  • No 12z 10/23 run was made due to dew system maintainence, so the NDASEXP cycle was restarted from NDASY atmospheric and land states
  • 2007/10/19/12 Ferrier, Ek
  • Switched back to using the original version of the unified LSM, but corrected to remove a bug which induced spurious warming at the surface which was triggered by the presence of tiny amounts if ice (likely hail/graupel) reaching the surface.
  • Values in the F_RimeF array are set to 1.0 if no ice is present at a grid point. Before this change, the value of the array could be >1 if rimed ice was present in the previous time step, but then ice was no longer present in the current time step. The values of this array were not reset to 1, so that the "memory" of what happened in earlier times in the forecast affected this array.
  • 2007/10/18/18 Ek, Ferrier, Rogers
  • In the WRF-NMM model, switched to using a version of the unified LSM which "mimics" the ops NMM-LSM (sf_surface_physics=99) land-surface physics module.
  • 2007/10/16/18 Ferrier, Rogers
  • Turn off call to gravity wave drag module in module_PHYSICS_CALLS.
  • NDASR restarted from NDASY atmospheric and land states
  • 2007/09/26/12 Treadon, Wu
  • Turned off three AQUA AIRS channels (300, 843, 1783) due to increased noise.
  • 2007/09/24/18 Ferrier
  • Set SIGFAC back to 0 in the gravity wave drag formulation
  • NDASR restarted from NDASY atmospheric and land states
  • 2007/09/08/00 Ek, Mitchell
  • Began running with Unified Land-Surface physics package (sf_surface_physics=2 in WRF-NMM namelist)
  • Set SIGFAC=3 in gravity wave drag formulation (same as NAMY)
  • NDASR restarted from NDASY atmospheric and land states
  • 2007/08/31/18 Parrish
  • Strong balance constraint in GSI turned off because the map factor was not properly accounted for (it was assumed to be constant) when obtaining stream and potential functions.
  • NDASR restarted from NDASY atmospheric and land states
  • 2007/08/28/18 Wu, Parrish
  • Changes to the GSI analysis:
    1. Latest (August 2007) GSI version with revised strong balance constraint
  • 2007/08/28/12 Black, Ferrier, Gayno, Janjic, Lin, Parrish, Pyle, Rogers, Wu
  • First run of this parallel, using the current NAMY as control. Changes in NAMY vs ops NAM:
    1. WRF-NMM Model changes:
      1. Run with WRF-NMM V2.2 code with IJK array indexing
      2. Use gravity wave drag/mountain blocking. Run with SIGFAC=0: gravity wave drag responds only to ELEVMAX, the maximum elevation within the grid box only. No further inflation is done based on the standard deviation of the 30" heights in the grid box.
      3. Use of new passive advection with the requirement for exact conservation of specific humidity, TKE, and cloud water relaxed in the advection step. The exact conservation is still required in the antifiltering step following the advection step.
      4. Stratospheric ozone fix in the computation of latitude: the error led to using climatological ozone values valid at the equator at all latitudes.
      5. Remove two modifications to longwave radiation made for the June 2006 WRF-in-NAM implementation
        1. Remove averaging of longwave temperature tendencies from the lowest two model layer
        2. Compute the upward LW at the surface was based on the ground (skin) temperature instead of the average of the skin and lowest model layer temperatures.
    2. GSI analysis changes:
      1. New GSI version with ijk and ikj I/O
      2. Retuned background errors (gives improved obs fit to first guess)
      3. use AIRS radiance data
      4. use GOES 1X1 radiance data
      5. SATWND (eumetsat and modis)
      6. MESONET uv (winds with uselist)
    3. Use new terrain with "3x3" (smoothed-desmoothed) smoothing, a smaller (more realistic) Great Salt Lake, better depiction of the Channel Islands off the California coast, and spurious waterfalls removed.
    4. Use 12-36 h forecast precipitation from the 00z ops NAM run to fill in for the CONUS-based Stage II/IV analysis as a driver for NDAS soil moisture outside of the CONUS (OCONUS)
  • Page Last Modified: 12 April 2007