Switched NAM parallel to use parallel T382 GFS for lateral boundary conditions.
Switched DGEX parallel to use parallel T382 GFS for lateral boundary conditions.
Switched web graphics and real-time verification jobs to use the NCO production parallel NAM
and DGEX. A parallel NDAS will still run on blue as a backup to the production parallel NDAS.
Changed value of the leaf-area index from 4.0 to 2.0 in the post-processor so that it
is consistent with the value used in the land-surface model. Because of this error the post-processed
canopy conductance was twice as large as it should be.
||Ek, Mitchell, Rogers
Removed this change to subroutine SFCDIF :
for the profile functions for the very stable boundary layer (z/L=>1), impose a consistent limit on z0/L.
Revert back to ops formulation due to non-meteorological 10-m winds on high mountain peaks.
Due to system problems causing a break in the full cycle, the NDAS-X cycle was
restarted from ops NDAS atmopsheric states and NDAS-X land states.
Began use of modified greenness fraction file with corrected values for this parameter
north of 58N
Start of DGEX parallel with winter 2005 change package, consisting
of a 00z Alaska DGEX parallel and an 06Z CONUS DGEX parallel.
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
Absorption coefficient for ice is made to be the same as in operations.
Reset the maximum number concentration of large ice back to 20 per liter as in operations.
||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 changes 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.
Changed the standard deviation of RH for grid-scale condensation from 2% to 1%
Changed "RHsat=.5*(RHgrd+H1)" to "RHsat=RHgrd", which will have the effect of an
earlier onset for partial cloudiness, which will be mitigated by the change in the first bullet.
These changes make the cloud cover more "binary"
The absorption coefficients for ice are changed back to their earlier values,
which are slightly less than what's currently used in the ops Eta.
The original exponential factor (0.75) was put back into the
relationship used to calculate longwave emissivities from cloud optical depths.
This change should have been made along with the other changes on 2004/11/20/12
when reverting back to operational values for cloud calculating cloud optical
depths. Prior to this change the solar absorption by clouds was made to be the
same as in the EtaZ parallel, but the longwave emissivities were (inadvertently)
larger than what's parameterized in operations.
Revert back to ops Eta values for the cloud water
and cloud ice absorption coefficients
Increased the assumed number concentration of cloud droplets from
100 back to 200 /cm**3, which increases the threshold cloud water mixing ratio
for autoconversion to rain from 0.419 to 0.838 g/m**3. Also increased
the maximum number concentration of precipitation ice particles from 10
back to 20 per liter.
Added changes to forecast model and pre-processing to output
convective rain rate, to use convective rain rate in the visibility
algorthim, and to output instantaneous TOA outgoing long-wave radiation.
Decreased the assumed number concentration of cloud droplets from
200 to 100 /cm**3, which reduces the threshold cloud water mixing ratio
for autoconversion to rain from 0.838 to 0.419 g/m**3. Also decreased
the maximum number concentration of precipitation ice particles from 20
to 10 per liter. Both changes are intended to lower the amount of
suspended condensate in the atmosphere, which should help reduce the
cool bias that has developed below clouds in the parallel.
Fixed a minor bug in ADJPPT1 that limits the amount of cloud water
from exceeding the autoconversion threshold
A new cloud cover scheme is introduced in order to increase
the presence of forecast partial cloudiness. Two adjustable
parameters in the scheme have been tuned to match the AFWA total
cloud cover product. The first parameter (STSDM) is the assumed
standard deviation of total grid-scale relative humidity in the grid
box, and it is set to 2%. The second parameter (RHsat) is the total
relative humidity associated with an assumed cloud fraction of 50%,
and it is set to the average of the threshold relative humidity for
the onset of grid-scale condensation (RHgrd) and a value of 100%
(i.e., 98.3% for the 32-km runs).
In calculating longwave emissivities in cloudy layers,
the optical depths for cloud water are obtained using the downwelling
longwave (LW) relationships of Smith and Shi (1992). This change has
resulted in nearly a factor of two increase in the LW absorption
coefficient for cloud water. The LW absorption coefficient for ice
remains the same as what's currently running in the operational Eta
In calculating solar absorption, the optical depths for cloud
water and for ice (cloud ice and snow) are obtained using the relationships
described by eqs. (5.2), (5.3), and Table 9 from Hou et al. (2002), assuming
a constant effective radius of 10 microns for cloud water and 75 microns for
ice. For cloud water optical depths, equal weighting is assumed for
absorption of UV-VIS and near IR radiation. The net effect of this change
is to double the solar absorption from liquid water clouds and halve the
absorption from ice clouds.
In the operational radiation, a minimum optical depth is assumed
for grid-scale liquid water clouds consistent with a minimum mixing ratio
of 0.1 g/kg. This lower limit has been removed.