PROGRAM ncommas_to_dart
Attention
NCOMMAS
works with versions of DART before Manhattan (9.x.x) and has yet to be updated. If you are interested in
using NCOMMAS
with more recent versions of DART, contact DAReS staff to assess the feasibility of an update.
Until that time, you should consider this documentation as out-of-date.
ncommas_to_dart
is the program that reads a ncommas restart file (usually ncommas_restart.nc
) and creates a
DART state vector file (e.g. perfect_ics, filter_ics, ...
).ncommas_vars.nml
file.ncommas_to_dart
:a valid
input.nml
namelist file for DARTa valid
ncommas_vars.nml
namelist file for ncommasthe ncommas restart file mentioned in the
input.nml&model_nml:ncommas_restart_filename
variable.
Since this program is called repeatedly for every ensemble member, we have found it convenient to link the ncommas
restart files to the default input filename (ncommas_restart.nc
). The default DART state vector filename is
dart_ics
- this may be moved or linked as necessary.
Namelist
This namelist is read from the file input.nml
. Namelists start with an ampersand ‘&’ and terminate with a slash ‘/’.
Character strings that contain a ‘/’ must be enclosed in quotes to prevent them from prematurely terminating the
namelist.
&model_nml
ncommas_restart_filename = 'ncommas_restart.nc';
assimilation_period_days = 1,
assimilation_period_seconds = 0,
model_perturbation_amplitude = 0.2,
output_state_vector = .true.,
calendar = 'Gregorian',
debug = 0
/
&ncommas_to_dart_nml
ncommas_to_dart_output_file = 'dart_ics'
/
ncommas_to_dart_nml
and model_nml
are always read from a file called input.nml
. The full description of the
model_nml
namelist is documented in the NCOMMAS model_mod.
Item |
Type |
Description |
---|---|---|
ncommas_to_dart_output_file |
character(len=128) |
The name of the DART file which contains the updated model state info that should be written into the NCOMMAS file. |
ncommas_vars_nml
is always read from a file called ncommas_vars.nml
.
Item |
Type |
Description |
---|---|---|
ncommas_state_variables |
character(len=NF90_MAX_NAME) :: dimension(160) |
The list of variable names in the NCOMMAS restart file to use to create the DART state vector and their corresponding DART kind. |
&ncommas_vars_nml
ncommas_state_variables = 'U', 'QTY_U_WIND_COMPONENT',
'V', 'QTY_V_WIND_COMPONENT',
'W', 'QTY_VERTICAL_VELOCITY',
'TH', 'QTY_POTENTIAL_TEMPERATURE',
'DBZ', 'QTY_RADAR_REFLECTIVITY',
'WZ', 'QTY_VERTICAL_VORTICITY',
'PI', 'QTY_EXNER_FUNCTION',
'QV', 'QTY_VAPOR_MIXING_RATIO',
'QC', 'QTY_CLOUDWATER_MIXING_RATIO',
'QR', 'QTY_RAINWATER_MIXING_RATIO',
'QI', 'QTY_ICE_MIXING_RATIO',
'QS', 'QTY_SNOW_MIXING_RATIO',
'QH', 'QTY_GRAUPEL_MIXING_RATIO'
/
Modules used
assim_model_mod
location_mod
model_mod
null_mpi_utilities_mod
obs_kind_mod
random_seq_mod
time_manager_mod
types_mod
utilities_mod
Files read
ncommas restart file;
ncommas_restart.nc
DART namelist files;
input.nml
andncommas_vars.nml
Files written
DART state vector file; e.g.
dart_ics
References
none