Available CEM Data for SCM Validations
The CEM simulations are described in Xu and Randall (1996), entitled
"Explicit simulation of cumulus ensembles with the GATE Phase III data:
Comparison with observations." J. Atmos. Sci., 53, 3710-3736.
The simulations cover the entire Phase III period between 1 and 18 September 1974.
The observational data set includes two additional days on August 30 and 31.
Because of the missing data on the first day, SCM simulations are recommended
to start either from 31 August or from 1 September.
The simulated data provided here represent the control simulation G described in Xu
and Randall (1996), averaged over the entire CEM domain in horizontal space and
3 hr in time. Please note that most of the data provided here are yet to be
published by the authors. It is highly recommended for any user to contact either
Dr. Xu or Prof. Randall regarding the usage of these data. For comments, or
additional information on the data and simulation,
contact Kuan-Man Xu,
kmxu@asdsun.larc.nasa.gov.
The following data are grouped into six different categories. The plots shown
below are for the convenience of any user. The actual data can be ftped from
an anonymous ftp site.
The observational data set
analyzed by Thompson et al. (1979)
Time-height cross section of the observed temperature deviation from the 20-day mean
of the GATE Phase III. The contour interval is 0.5 K.
Time-height cross section of the observed specific humidity deviation from the 20-day
mean of the GATE Phase III. The contour interval is 0.5 g/kg.
Time-height cross section of the observed x-component wind velocity for the 20-day
of the GATE Phase III. The contour interval is 3 m/s.
Time-height cross section of the observed y-component wind velocity for the 20-day
of the GATE Phase III. The contour interval is 3 m/s.
Time-height cross section of the observed omega vertical velocity for the 20-day
of the GATE Phase III. The contour interval is 5 mb/s.
Time-height cross section of the observed horizontal temperature advective tendency
for the 20-day of the GATE Phase III. The contour interval is 1 K/day.
Time-height cross section of the observed horizontal moisture advective tendency
for the 20-day of the GATE Phase III. The contour interval is 1 g/kg/day.
Time-height cross section of the observed total temperature advective tendency
for the 20-day of the GATE Phase III. The contour interval is 2 K/day.
Time-height cross section of the observed total moisture advective tendency
for the 20-day of the GATE Phase III. The contour interval is 1 g/kg/day.
Time-height cross section of the observed apparent heat source
for the 20-day of the GATE Phase III. The contour interval is 3 K/day.
Time-height cross section of the observed apparent moisture sink
for the 20-day of the GATE Phase III. The contour interval is 3 K/day.
Time-height cross section of the diagnosed radiative heating rate
for the 18-day of the GATE Phase III, starting from 1 September 1974.
The contour interval is 0.5 K/day.
Time series of the observed daily mean SST (Krishnamurti et al. 1976) shown
in solid line, starting from 31 August 1974. The dashed shows the 3-hourly variation
of SST diagnosed from the sensible heat flux, surface wind speed and surface air
temperature.
CEM simulated state variables
Time-height cross section of the simulated temperature deviation from
the 18-day mean of the GATE Phase III, starting from 1 September 1974.
The contour interval is 0.5 K.
Time-height cross section of the simulated specific humidity deviation from
the 18-day mean of the GATE Phase III, starting from 1 September 1974.
The contour interval is 0.2 g/kg.
Time-height cross section of the simulated cloud water mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Time-height cross section of the simulated cloud ice mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Time-height cross section of the simulated snow mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Time-height cross section of the simulated graupel mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Time-height cross section of the simulated rainwater mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Time-height cross section of the simulated total condensate mixing ratio for
the GATE Phase III, starting from 1 September 1974. The contour interval is 0.02 g/kg.
The contour of 0.01 g/kg is added in the plot.
Mass budgets for convective and stratiform regions
Time-height cross section of the simulated updraft mass flux in the convective
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
2 mb/h.
Time-height cross section of the simulated downdraft mass flux in the convective
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
1 mb/h.
Time-height cross section of the simulated total mass flux in the convective
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
2 mb/h.
Time-height cross section of the simulated updraft mass flux in the stratiform
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
2 mb/h.
Time-height cross section of the simulated downdraft mass flux in the stratiform
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
1 mb/h.
Time-height cross section of the simulated total mass flux in the stratiform
regions for the GATE Phase III, starting from 1 September 1974. The contour interval is
2 mb/h.
Heat and moisture budgets for convective and stratiform regions
Time-height cross section of the simulated, domain-averaged apparent heat source
for the GATE Phase III, starting from 1 September 1974. The contour interval is
3 K/day.
Time-height cross section of the simulated, domain-averaged apparent moisture sink
for the GATE Phase III, starting from 1 September 1974. The contour interval is
3 K/day.
The heat and moisture budgets for convective and stratiform regions are going to
be included here in near future.
Other variables for verification
Time-height cross section of the simulated relative humidity
for the GATE Phase III, starting from 1 September 1974. The contour interval is
0.05.
Time-height cross section of the simulated cloud fraction
for the GATE Phase III, starting from 1 September 1974. The contour interval is
0.05.
Time-height cross section of the simulated radiative heating rate
for the GATE Phase III, starting from 1 September 1974. The contour interval is
0.5 K/day.
Time series of vertical-integrated and surface variables
Time series of the simulated and observed outgoing longwave radiation fluxes,
starting from 1 September 1974.
Time series of the simulated and observed surface evaporation rates,
starting from 1 September 1974.
Time series of the simulated and observed surface precipitation rates,
starting from 1 September 1974.
Time series of the simulated and observed precipitable water,
starting from 1 September 1974.
Time series of the simulated and observed generalized convective available
potential energy (GCAPE), starting from 1 September 1974.
Time series of the daily mean observed (solid) and simulated (dashed)
high-level cloudiness, starting from 1 September 1974.
Time series of the daily mean observed (solid) and simulated (dashed)
low-level cloudiness, starting from 1 September 1974.
Time series of the daily mean observed (solid) and simulated (dashed)
mid-level cloudiness, starting from 1 September 1974.
Time series of the daily mean observed (solid) and simulated (dashed)
upper-level cloudiness, starting from 1 September 1974.
Time series of the daily mean observed (solid) and simulated (dashed)
total cloudiness, starting from 1 September 1974.