Python wrapper for the NOAA Environmental Modeling System
Project description
NEMSpy
NEMSpy generates configuration files (nems.configure, config.rc, model_configure, atm_namelist.rc)
for coupled modeling applications run with a compiled NEMS binary (not included).
NEMS implements the National Unified Operational Prediction Capability (NUOPC), and configuration files built for NEMS will also work for most NUOPC applications.
Usage:
from datetime import datetime, timedelta
from nemspy import ModelingSystem
from nemspy.model import ADCIRC, AtmosphericMesh, NationalWaterModel, WaveMesh
# model run time
start_time = datetime(2020, 6, 1)
duration = timedelta(days=1)
# returning interval of main run sequence
interval = timedelta(hours=1)
# directory to which configuration files should be written
output_directory = '~/nems_configuration/'
# model entries
atmospheric_mesh = AtmosphericMesh('~/wind_atm_fin_ch_time_vec.nc')
wave_mesh = WaveMesh('~/ww3.Constant.20151214_sxy_ike_date.nc')
ocean_model = ADCIRC(processors=11, verbose=True, DumpFields=False)
hydrological_model = NationalWaterModel(processors=769, DebugFlag=0)
# instantiate model system with a specified order of execution
nems = ModelingSystem(
start_time,
duration,
interval,
atm=atmospheric_mesh,
wav=wave_mesh,
ocn=ocean_model,
hyd=hydrological_model,
)
# form connections between models
nems.connect('WAV', 'OCN')
nems.connect('ATM', 'HYD')
nems.connect('WAV', 'HYD')
# form mediations between models with custom functions
nems.mediate('ATM', 'OCN', ['MedPhase_atm_ocn_flux'])
nems.mediate('HYD', None)
nems.mediate(None, 'OCN', ['MedPhase_prep_ocn'], processors=2)
# define execution order
nems.sequence = [
'MED -> OCN',
'ATM',
'ATM -> MED -> OCN',
'WAV -> OCN',
'OCN',
'WAV',
'ATM -> HYD',
'WAV -> HYD',
'HYD',
'HYD -> MED',
]
# write configuration files to the given directory
nems.write(output_directory, overwrite=True)
Output:
nems.configure
#############################################
#### NEMS Run-Time Configuration File #####
#############################################
# EARTH #
EARTH_component_list: ATM WAV OCN HYD MED
EARTH_attributes::
Verbosity = min
::
# MED #
MED_model: implicit
MED_petlist_bounds: 0 1
MED_attributes::
Verbosity = min
::
# ATM #
ATM_model: atmesh
ATM_petlist_bounds: 2 2
ATM_attributes::
Verbosity = min
::
# OCN #
OCN_model: adcirc
OCN_petlist_bounds: 2 12
OCN_attributes::
Verbosity = max
DumpFields = false
::
# WAV #
WAV_model: ww3data
WAV_petlist_bounds: 13 13
WAV_attributes::
Verbosity = min
::
# HYD #
HYD_model: nwm
HYD_petlist_bounds: 14 782
HYD_attributes::
Verbosity = min
DebugFlag = 0
::
# Run Sequence #
runSeq::
@3600
MED MedPhase_prep_ocn
MED -> OCN :remapMethod=redist
ATM
ATM -> MED :remapMethod=redist
MED MedPhase_atm_ocn_flux
MED -> OCN :remapMethod=redist
WAV -> OCN :remapMethod=redist
OCN
WAV
ATM -> HYD :remapMethod=redist
WAV -> HYD :remapMethod=redist
HYD
HYD -> MED :remapMethod=redist
@
::
config.rc
atm_dir: ~
atm_nam: wind_atm_fin_ch_time_vec.nc
wav_dir: ~
wav_nam: ww3.Constant.20151214_sxy_ike_date.nc
model_configure
core: gfs
print_esmf: .true.
nhours_dfini=0
#nam_atm +++++++++++++++++++++++++++
nlunit: 35
deltim: 900.0
fhrot: 0
namelist: atm_namelist
total_member: 1
grib_input: 0
PE_MEMBER01: 784
PE_MEMBER02
PE_MEMBER03
PE_MEMBER04
PE_MEMBER05
PE_MEMBER06
PE_MEMBER07
PE_MEMBER08
PE_MEMBER09
PE_MEMBER10
PE_MEMBER11
PE_MEMBER12
PE_MEMBER13
PE_MEMBER14
PE_MEMBER15
PE_MEMBER16
PE_MEMBER17
PE_MEMBER18
PE_MEMBER19:
PE_MEMBER20:
PE_MEMBER21:
# For stochastic perturbed runs - added by Dhou and Wyang
--------------------------------------------------------
# ENS_SPS, logical control for application of stochastic perturbation scheme
# HH_START, start hour of forecast, and modified ADVANCECOUNT_SETUP
# HH_INCREASE and HH_FINAL are fcst hour increment and end hour of forecast
# ADVANCECOUNT_SETUP is an integer indicating the number of time steps between integration_start and the time when model state is saved for the _ini of the GEFS_Coupling, currently is 0h.
HH_INCREASE: 600
HH_FINAL: 600
HH_START: 0
ADVANCECOUNT_SETUP: 0
ENS_SPS: .false.
HOUTASPS: 10000
#ESMF_State_Namelist +++++++++++++++
RUN_CONTINUE: .false.
#
dt_int: 900
dt_num: 0
dt_den: 1
start_year: 2020
start_month: 6
start_day: 1
start_hour: 0
start_minute: 0
start_second: 0
nhours_fcst: 24
restart: .false.
nhours_fcst1: 24
im: 192
jm: 94
global: .true.
nhours_dfini: 0
adiabatic: .false.
lsoil: 4
passive_tracer: .true.
dfilevs: 64
ldfiflto: .true.
num_tracers: 3
ldfi_grd: .false.
lwrtgrdcmp: .false.
nemsio_in: .false.
#jwstart added quilt
###############################
#### Specify the I/O tasks ####
###############################
quilting: .false. #For asynchronous quilting/history writes
read_groups: 0
read_tasks_per_group: 0
write_groups: 1
write_tasks_per_group: 3
num_file: 3 #
filename_base: 'SIG.F' 'SFC.F' 'FLX.F'
file_io_form: 'bin4' 'bin4' 'bin4'
file_io: 'DEFERRED' 'DEFERRED' 'DEFERRED' 'DEFERRED' #
write_dopost: .false. # True--> run do on quilt
post_gribversion: grib1 # True--> grib version for post output files
gocart_aer2post: .false.
write_nemsioflag: .TRUE. # True--> Write nemsio run history files
nfhout: 3
nfhout_hf: 1
nfhmax_hf: 0
nsout: 0
io_recl: 100
io_position: ' '
io_action: 'WRITE'
io_delim: ' '
io_pad: ' '
#jwend
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