Mesoscale Parallel Experiment Change Log
Eta-32 with changes to the Eta land-surface physics,
bias adjustment of multi-sensor precipitation analyses using
daily gauge data, and the assimilation of GOES-12 radiances
||Y. Lin, Rogers
ADJPPT2.F is changed so that we do NOT increase cloud ice
proportionally when Pobs > Pmod. The old set up can lead
to excess build-up of CWM. Changed in all 32km parallel runs.
Discovered that ETAV (32-km control) was not
using GOES-12 radinaces, while ETAY aand ETAL were. GOES-12
weas turned on in ETAV and ETAY, ETAL were restarted from
||Ek, Mitchell, Rogers
Included zenith angle fix (valid at top of the hour) in
RADTN; removed erroneous version of this fix in CHKOUT
(Both also changes in ETAV control)
Removed use average temperature of the lowest
2 atmos levels (above the surface) in the longwave radiation
Changes to subroutines MIXLEN and PRODQ2 which
removes mixing length limits under stable conditions --
should increase (downward) turbulent heat mixing in
Subroutine SFCDIF was changed : For the profile
functions for the very stable boundary layer (z/L=>1), impose
a consistent limit on z0/L.
ETAV control upgraded to use Mar 2004 version of the
ops Eta model, including bias adjustment of precip analyses,
use of precip type from microphysics in LSM.
EDAS restarted from ETAV control
Changes to two parameters (SNUP, SALP) in the snow-cover
fraction formulation so as to decrease
snow cover fraction (and hence decrease snow albedo) for
a given snowdepth (given snow water
equivalent) below a (now higher) threshhold for the snowdepth.
Diurnally adjusted surface albedo fed to Noah LSM model
||H.-M. Lin, Ferrier
A minor bug in determining the cloud amounts and the cloud-base levels
in the longwave calculations was
corrected for clouds at the ground (i.e., fog).
"Inflation" of the hourly multi-sensor precipitation analyses now performed
in the budget history calculation step instead of inside the forecast model, and
the inflation factor was reduced from 1.2 to 1.1
Page Last Modified: October 30, 2003