||Rogers, Ek, Ferrier, Mitchell
Revert to ETAY version of cloud/radiation changes
Change snow emissivity form 0.95 to 0.9
Restart cycled EDAS from ETAY control
Turned back on use of Level 2.5 NEXRAD data in 3DVAR,
only sites with good lat/lon data (about 15-20% of original total)
are included in the data dump.
||Bender, Keyser, Rogers
Revert back to ops radial wind data due to 75-85% of
the Level 2.5 supob reports in /dcom/us007003/*/b006/xx002 having
a missing superob longitude (SUPLON) and a superob latitude (SUPLAT)
equal to 65.530 (for every report with a missing SUPLON). It
appears that something is corrupt in the incoming Level 2.5 raw
files from which SUPLAT and SUPLON are generated.
||Ek, Mitchell, Ferrier, Rogers
Snow emissivity changed from 0.9 to 0.95
Added the effects of snow emissivity in the calculation of effective snow-ground
sfc temperature. This was done by changing the value from 1.0 to 0.9.
For the optical depth parameterization for grid-scale processes in the
absence of convection, changed CTau=0.08*min(1., Qc/Q0) to CTau=800*Qc.
Increase minimum stomatal conductance from 40s/m to 70s/m for cropland,
pasture, and grassland vegetation types in order to decrease surface evaporation.
Leaf area index (LAI) parameter in LSM physics changed from 1.0 to 2.0
Begin use of new 3DVAR analysis which uses a 2dvar surface analysis
to assimilate surface temperature data.
Began use of 3DVAR code assimilating NEXRAD level 2.5 radial wind data
Change "LAI_DATA" in LSM physics from 3.0 to 1.0
Revert to ops versions of MIXLEN, PRODQ2, switch to experimental versions of
DIFCOF, TURBL, SFCDIF (see 8/23/04 entry)
New precipitation assimilation scheme (routine ADJPPT) modified
to account for the fact that the variable F_rain is actually the fraction
of liquid condensate that is rain, not the fraction of total condensate that
is liquid rain
||Ek, Wong, Mitchell. Rogers
Upgrade to version 2.8 of NoahLSM with new hi-res soil and vegetation type definitions:
CLASS USGS-WRF VEGETATION/SURFACE TYPE
SOIL TYPE CLASS
- Urban and Built-Up Land
- Dryland Cropland and Pasture
- Irrigated Cropland and Pasture
- Mixed Dryland/Irrigated Cropland and Pasture
- Cropland/Grassland Mosaic
- Cropland/Woodland Mosaic
- Mixed Shrubland/Grassland
- Deciduous Broadleaf Forest
- Deciduous Needleleaf Forest
- Evergreen Broadleaf Forest
- Evergreen Needleleaf Forest
- Mixed Forest
- Water Bodies
- Herbaceous Wetland
- Wooded Wetland
- Barren or Sparsely Vegetated
- Herbaceous Tundra
- Wooded Tundra
- Mixed Tundra
- Bare Ground Tundra
- Snow or Ice
- White Sand
Land states restarted from 00Z 7/28/2004 ETAL (last ETAL run w/hi-res soil and
- LOAMY SAND
- SANDY LOAM
- SILT LOAM
- SANDY CLAY LOAM
- SILTY CLAY LOAM
- CLAY LOAM
- SANDY CLAY
- SILTY CLAY
- ORGANIC MATERIAL
- WHITE SAND
Added version 2.7 of noah LSM land-surface physics, including changes to
model formulation parameters, and some additional numerical refinements. Effects of
the vegetation greenness factor are removed from the snow albedo formulation, leading to an increase
in albedo under snow-covered conditions. The Eta model cloud microphysics now passes
the fraction of frozen precipitation to the Noah LSM, eliminating the crude determination
of frozen precipitation by the Noah LSM based on lowest (atmospheric) model level air
temperature. Separate snow sublimation and non-snow-covered evaporation is now considered
for patchy snow cover conditions when snowpack is shallow, reducing snow sublimation and
snowpack depletion. Changes to parameters in the patchy snow cover formulation decrease
the snow depth for 100 percent snow cover. A reduction in vegetation-dependent soil
moisture threshold values will increase transpiration. The depth at which the lower
boundary condition on soil temperature is applied is increased from 3 meters to 8 meters.
The thermal heat capacity of mineral soil has been changed to a more standard value.
A change to the coefficient in the thermal-roughness length calculation will decrease
the surface skin-atmosphere temperature gradient. The sea-ice albedo is changed from
0.60 to 0.65. A diagnostic soil heat flux calculation included at the end of the
Noah LSM code leads to better closure of the surface energy budget.
Reduced parameter CZIL from 0.2 to 0.1. This change will reduce aerodyamnic resistance
(i.e. surface turbulent exchange coefficients are too low during mid-day)
Parameter SMHIGH_DATA reduced from 6.0 to 3.0; this will raise the value of the
reference soil moisture value below which vegetation becomes stressed (SMCREF),
which (at first order) should reduce the transpiration (surface moisture flux).
||Ferrier, Freedman, Janjic, Ek, Mitchell, Rogers
DIFCOF.F & TURBL.F changed:
In very stable conditions when the PBL depth is diagnosed as the lowest
Eta model level above the surface, impose a lower limit on eddy
diffusivity (Km,Kh) of 0.5 m^2/s up to (and one level above) the
inversion height in order to maintain atmospheric turbulent mixing at
least above this nominally small value.
Subroutine SFCDIF was changed : For the profile functions
for the very stable boundary layer (z/L=>1),
impose a consistent limit on z0/L.
Changes to subroutines MIXLEN and PRODQ2 which removes mixing
length limits under stable conditions -- should increase (downward)
turbulent heat mixing in stable conditions.
Fixed error which caused the analyzed precipitation to be incorrectly fed to the top