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assim_synth_obs.py 21.11 KiB
import os, sys, shutil, warnings, glob
import time as time_module
import datetime as dt
import numpy as np
from dartwrf.utils import symlink, copy, mkdir, try_remove, print, shell, write_txt
from dartwrf import wrfout_add_geo
from dartwrf.obs import error_models as err
from dartwrf.obs import obsseq
from dartwrf.obs import create_obsseq_out as osq_out
from dartwrf import dart_nml
from dartwrf.exp_config import exp
from dartwrf.server_config import cluster
wrfout_format = 'wrfout_d01_%Y-%m-%d_%H:%M:%S'
def link_nature_to_dart_truth(time):
"""Set a symlink from the WRFout file to be used as nature to the run_DART folder
Args:
time (dt.datetime): Time at which observations will be made
"""
# get wrfout_d01 from nature run
# find the file in any init directory
fformat = 'wrfout_d01_%Y-%m-%d_%H:%M:%S'
f_nat = glob.glob(cluster.archive_base + '/' + exp.nature_expname + '/*/1/'+time.strftime(fformat))[0]
shutil.copy(f_nat, cluster.dart_rundir + "/wrfout_d01")
# DART may need a wrfinput file as well ?!
symlink(cluster.dart_rundir + "/wrfout_d01",
cluster.dart_rundir + "/wrfinput_d01")
print("linked", f_nat, "to", cluster.dart_rundir + "/wrfout_d01")
def prepare_nature_dart(time):
print("linking nature to DART & georeferencing")
link_nature_to_dart_truth(time)
if cluster.geo_em_for_WRF_ideal:
wrfout_add_geo.run(cluster.geo_em_for_WRF_ideal, cluster.dart_rundir + "/wrfout_d01")
def prepare_prior_ensemble(assim_time, prior_init_time, prior_valid_time, prior_path_exp):
"""Prepares DART files for running filter
i.e.
- links first guess state to DART first guess filenames
- creates wrfinput_d01 files
- adds geo-reference (xlat,xlon) coords so that DART can deal with the files
- writes txt files so DART knows what input and output is
- removes probably pre-existing files which could lead to problems
"""
print("prepare prior state estimate")
for iens in range(1, exp.n_ens + 1):
print("link wrfout file to DART background file")
wrfout_run = (
prior_path_exp
+ prior_init_time.strftime("/%Y-%m-%d_%H:%M/")
+ str(iens)
+ prior_valid_time.strftime("/"+wrfout_format)
)
dart_ensdir = cluster.dart_rundir + "/prior_ens" + str(iens)
wrfout_dart = dart_ensdir + "/wrfout_d01"
os.makedirs(dart_ensdir, exist_ok=True)
print("copy", wrfout_run, "to", wrfout_dart)
copy(wrfout_run, wrfout_dart)
symlink(wrfout_dart, dart_ensdir + "/wrfinput_d01")
# ensure prior time matches assim time (can be intentionally different)
if assim_time != prior_valid_time:
print("overwriting time in prior from nature wrfout")
shell(cluster.ncks+ " -A -v XTIME,Times "+
cluster.dart_rundir+"/wrfout_d01 "+ wrfout_dart)
# this seems to be necessary (else wrong level selection)
if cluster.geo_em_for_WRF_ideal:
wrfout_add_geo.run(cluster.geo_em_for_WRF_ideal, wrfout_dart)
write_list_of_inputfiles_prior()
write_list_of_outputfiles()
print("removing preassim and filter_restart")
os.system("rm -rf " + cluster.dart_rundir + "/preassim_*")
os.system("rm -rf " + cluster.dart_rundir + "/filter_restart*")
os.system("rm -rf " + cluster.dart_rundir + "/output_mean*")
os.system("rm -rf " + cluster.dart_rundir + "/output_sd*")
os.system("rm -rf " + cluster.dart_rundir + "/perfect_output_*")
os.system("rm -rf " + cluster.dart_rundir + "/obs_seq.fina*")
def write_list_of_inputfiles_prior():
"""Instruct DART to use the prior ensemble as input
"""
files = []
for iens in range(1, exp.n_ens+1):
files.append("./prior_ens" + str(iens) + "/wrfout_d01")
write_txt(files, cluster.dart_rundir+'/input_list.txt')
def write_list_of_inputfiles_posterior(assim_time):
"""Use posterior as input for DART, e.g. to evaluate the analysis in observation space
"""
filedir = cluster.archivedir+assim_time.strftime("/%Y-%m-%d_%H:%M/assim_stage0/")
files = []
for iens in range(1, exp.n_ens+1):
files.append(filedir+'filter_restart_d01.'+str(iens).zfill(4))
write_txt(files, cluster.dart_rundir+'/input_list.txt')
def write_list_of_outputfiles():
files = []
for iens in range(1, exp.n_ens+1):
files.append("./filter_restart_d01." + str(iens).zfill(4))
write_txt(files, cluster.dart_rundir+'/output_list.txt')
def filter(nproc=12):
print("time now", dt.datetime.now())
print("running filter")
os.chdir(cluster.dart_rundir)
try_remove(cluster.dart_rundir + "/obs_seq.final")
t = time_module.time()
if nproc < 12:
shell(cluster.dart_modules+' mpirun -np 12 ./filter &> log.filter')
else: # -genv I_MPI_PIN_PROCESSOR_LIST=0-"+str(int(nproc) - 1)
shell(cluster.dart_modules+" mpirun -np "+str(int(nproc))+" ./filter > log.filter")
print("./filter took", int(time_module.time() - t), "seconds")
if not os.path.isfile(cluster.dart_rundir + "/obs_seq.final"):
raise RuntimeError(
"obs_seq.final does not exist in " + cluster.dart_rundir,
"\n look for " + cluster.dart_rundir + "/log.filter")
############### archiving
def archive_filteroutput(time):
print("archiving ...")
archive_dir = cluster.archivedir + "/obs_seq_final/"
mkdir(archive_dir)
fout = archive_dir + time.strftime("/%Y-%m-%d_%H:%M_obs_seq.final")
copy(cluster.dart_rundir + "/obs_seq.final", fout)
print(fout, "saved.")
archive_assim = cluster.archivedir + time.strftime("/%Y-%m-%d_%H:%M/assim_stage0/")
mkdir(archive_assim)
copy(cluster.dart_rundir + "/input.nml", archive_assim + "/input.nml")
for iens in range(1, exp.n_ens + 1): # single members
copy(
cluster.dart_rundir + "/filter_restart_d01." + str(iens).zfill(4),
archive_assim + "/filter_restart_d01." + str(iens).zfill(4),
)
try: # not necessary for next forecast run
ftypes = ['preassim', 'postassim']
for ftype in ftypes:
for iens in range(1, exp.n_ens + 1):
fname = "/"+ftype+"_member_" + str(iens).zfill(4) + ".nc"
copy(cluster.dart_rundir + fname, archive_assim + fname)
for f in ["output_mean.nc", "output_sd.nc"]: # copy mean and sd to archive
copy(cluster.dart_rundir + "/" + f, archive_assim + "/" + f)
except Exception as e:
warnings.warn(str(e))
def get_parametrized_error(obscfg, osf_prior):
"""Calculate the parametrized error for an ObsConfig (one obs type)
Args:
obscfg (object): Configuration of observations
osf_prior (obsseq.ObsRecord): Contains truth and prior values from obs_seq.final
(output of ./final in evaluate-mode (no posterior))
Returns:
np.array: observation error std-dev for assimilation
"""
Hx_prior = osf_prior.get_prior_Hx().T
Hx_truth = osf_prior.get_truth_Hx()
# compute the obs error for assimilation on the averaged grid
# since the assimilation is done on the averaged grid
channel = obscfg.get("sat_channel")
if channel == 5:
return err.calc_obserr_WV('WV62', Hx_truth, Hx_prior)
if channel == 6:
return err.calc_obserr_WV('WV73', Hx_truth, Hx_prior)
else:
NotImplementedError('sat_channel not implemented', obscfg.get("sat_channel"))
def set_obserr_assimilate_in_obsseqout(oso, outfile="./obs_seq.out"):
""""Overwrite existing variance values in obs_seq.out files
Args:
oso (ObsSeq): python representation of obs_seq.out file, will be modified and written to file
Returns:
None (writes to file)
Variables:
osf_prior (ObsSeq): python representation of obs_seq.final (output of filter in evaluate-mode without posterior)
contains prior values; used for parameterized errors
"""
from dartwrf.obs.obskind import obs_kind_nrs
for obscfg in exp.observations:
kind_str = obscfg['kind'] # e.g. 'RADIOSONDE_TEMPERATURE'
kind = obs_kind_nrs[kind_str] # e.g. 263
# modify observation error of each kind sequentially
where_oso_iskind = oso.df.kind == kind
if obscfg["error_assimilate"] == False:
osf_prior = obsseq.ObsSeq(cluster.dart_rundir + "/obs_seq.final") # this file will be generated by `evaluate()`
where_osf_iskind = osf_prior.df.kind == kind
assim_err = get_parametrized_error(obscfg, osf_prior.df[where_osf_iskind])
oso.df.loc[where_oso_iskind, 'variance'] = assim_err**2
#assert np.allclose(assim_err, oso.df['variance']**2) # check
else:
# overwrite with user-defined values
oso.df.loc[where_oso_iskind, 'variance'] = obscfg["error_assimilate"]**2
oso.to_dart(outfile)
def qc_obs(time, oso):
osf_prior = obsseq.ObsSeq(cluster.dart_rundir + "/obs_seq.final")
# obs should be superobbed already!
for i, obscfg in enumerate(exp.observations):
if i > 0:
raise NotImplementedError()
obs = oso.df.observations.values
Hx_prior_mean = osf_prior.df['prior ensemble mean']
n_obs_orig = len(obs)
if obscfg.get("sat_channel") == 1:
if False:
print('removing obs with abs(FGD) < 0.05')
Hx_prior = osf_prior.df.get_prior_Hx().T
# Hx_prior_mean = np.mean(Hx_prior, axis=0)
#Hx_prior_spread = osf_prior.df['prior ensemble spread'].values
#Hx_prior_spread[Hx_prior_spread < 1e-9] = 1e-9
abs_FGD = abs(obs - Hx_prior_mean) # /Hx_prior_spread
oso.df = oso.df[abs_FGD > 0.05] # Hx_prior_spread]
# obs_dist_to_priormean = abs(obs - Hx_prior_mean)
# oso.df = oso.df[obs_dist_to_priormean > 5]
# print('removed', n_obs_orig-len(oso.df), 'observations with abs(FGD) smaller than 5')
else:
# set obs to prior mean => no change in mean but spread is adjusted.
abs_FGD = abs(obs - Hx_prior_mean) # /Hx_prior_spread
Hx_prior_median = np.median(osf_prior.df.get_prior_Hx(), axis=1)
oso.df.loc[abs_FGD <= 0.05, 'observations'] = Hx_prior_median[abs_FGD <= 0.05]
elif obscfg.get("sat_channel") == 6: # WV73
print('removing obs with abs(FGD) smaller than 5')
obs = oso.df.observations.values
n_obs_orig = len(obs)
abs_FGD = abs(obs - Hx_prior_mean) # /Hx_prior_spread
oso.df = oso.df[abs_FGD > 5]
else:
raise NotImplementedError('no obs QC implemented for this obs type')
print('QC removed', n_obs_orig-len(oso.df), 'observations')
# for archiving
f_out_archive = cluster.archivedir + "/obs_seq_out/" + time.strftime("/%Y-%m-%d_%H:%M_obs_seq.out-beforeQC")
os.makedirs(cluster.archivedir + "/obs_seq_out/", exist_ok=True)
copy(cluster.dart_rundir + "/obs_seq.out", f_out_archive)
# for assimilation later
f_out_dart = cluster.dart_rundir+'/obs_seq.out'
oso.to_dart(f_out_dart)
print('saved', f_out_dart)
def evaluate(assim_time,
obs_seq_out=False,
prior=True,
posterior=False,
output_format="%Y-%m-%d_%H:%M_obs_seq.final-evaluate"):
"""Calculates either prior or posterior obs space values.
Note: Depends on a prepared input_list.txt, which defines the ensemble (prior or posterior).
Output file: Saves obs_seq.final to `/archivedir/obs_seq_final/`
Args:
assim_time (datetime): time of assimilation
obs_seq_out (str, optional): use the argument as obs_seq.out file, defaults to use the existing obs_seq.out file
output_format (str, optional): format string for output filename, default is `"%Y-%m-%d_%H:%M_obs_seq.final-eval_posterior_allobs"`
Returns:
obsseq.ObsSeq
"""
if prior == posterior:
raise ValueError('either prior or posterior must be True, the other must be False')
os.makedirs(cluster.dart_rundir, exist_ok=True) # create directory to run DART in
os.chdir(cluster.dart_rundir)
link_DART_binaries_and_RTTOV_files()
# remove any existing observation files
os.system("rm -f input.nml obs_seq.final")
print("prepare nature")
prepare_nature_dart(assim_time) # link WRF files to DART directory
if posterior:
write_list_of_inputfiles_posterior(time)
if prior:
write_list_of_inputfiles_prior()
if obs_seq_out:
copy(obs_seq_out, cluster.dart_rundir+'/obs_seq.out')
else:
# use existing obs_seq.out file
if not os.path.isfile(cluster.dart_rundir+'/obs_seq.out'):
raise RuntimeError(cluster.dart_rundir+'/obs_seq.out does not exist')
dart_nml.write_namelist(just_prior_values=True)
filter(nproc=6)
# archiving
fout = cluster.archivedir + "/obs_seq_final/" + assim_time.strftime(output_format)
os.makedirs(cluster.archivedir + "/obs_seq_final/", exist_ok=True)
copy(cluster.dart_rundir + "/obs_seq.final", fout)
print(fout, "saved.")
def get_obsseq_out(time):
"""Prepares an obs_seq.out file in the run_DART folder
Args:
time (datetime): time of assimilation
Returns:
obsseq.ObsSeq
"""
if exp.use_existing_obsseq != False:
# use an existing obs_seq.out file
f_obsseq = time.strftime(exp.use_existing_obsseq)
copy(f_obsseq, cluster.dart_rundir+'/obs_seq.out')
print(f_obsseq, 'copied to', cluster.dart_rundir+'/obs_seq.out')
oso = obsseq.ObsSeq(cluster.dart_rundir + "/obs_seq.out") # read the obs_seq.out file
else:
# do NOT use an existing obs_seq.out file
# but generate observations with new observation noise
oso = osq_out.generate_obsseq_out(time)
return oso
def prepare_inflation_2(time, prior_init_time):
"""Prepare inflation files (spatially varying)
Recycles inflation files from previous assimilations
or takes default files from archive.
Args:
time (datetime): time of assimilation
prior_init_time (datetime): time of prior assimilation
"""
dir_priorinf = cluster.archivedir + prior_init_time.strftime("/%Y-%m-%d_%H:%M/assim_stage0/")
f_default = cluster.archive_base + "/input_priorinf_mean.nc"
f_prior = dir_priorinf + time.strftime("/%Y-%m-%d_%H:%M_output_priorinf_mean.nc")
f_new = cluster.dart_rundir + '/input_priorinf_mean.nc'
if os.path.isfile(f_prior):
copy(f_prior, f_new)
print(f_prior, 'copied to', f_new)
else: # no prior inflation file at the first assimilation
warnings.warn(f_prior + ' does not exist. Using default file instead.')
copy(f_default, f_new)
f_default = cluster.archive_base + "/input_priorinf_sd.nc"
f_prior = dir_priorinf + time.strftime("/%Y-%m-%d_%H:%M_output_priorinf_sd.nc")
f_new = cluster.dart_rundir + '/input_priorinf_sd.nc'
if os.path.isfile(f_prior):
copy(f_prior, f_new)
print(f_prior, 'copied to', f_new)
else:
warnings.warn(f_prior + ' does not exist. Using default file instead.')
copy(f_default, f_new)
def archive_inflation_2(time):
dir_output = cluster.archivedir + time.strftime("/%Y-%m-%d_%H:%M/assim_stage0/")
os.makedirs(dir_output, exist_ok=True)
f_output = cluster.dart_rundir + '/output_priorinf_sd.nc'
f_archive = dir_output + time.strftime("/%Y-%m-%d_%H:%M_output_priorinf_sd.nc")
copy(f_output, f_archive)
print(f_archive, 'saved')
f_output = cluster.dart_rundir + '/output_priorinf_mean.nc'
f_archive = dir_output + time.strftime("/%Y-%m-%d_%H:%M_output_priorinf_mean.nc")
copy(f_output, f_archive)
print(f_archive, 'saved')
def link_DART_binaries_and_RTTOV_files():
joinp = os.path.join
# link DART binaries
bins = ['perfect_model_obs', 'filter', 'obs_diag', 'obs_seq_to_netcdf']
for b in bins:
symlink(joinp(cluster.dart_srcdir, b),
joinp(cluster.dart_rundir, b))
# link RTTOV files
rttov_files = ['rttov13pred54L/rtcoef_msg_4_seviri_o3.dat',
'mfasis_lut/rttov_mfasis_cld_msg_4_seviri_deff.H5',
'cldaer_visir/sccldcoef_msg_4_seviri.dat']
try: # may fail quietly if we dont need RTTOV
for f_src in rttov_files:
destname = os.path.basename(f_src)
if 'rtcoef' in f_src:
destname = 'rtcoef_msg_4_seviri.dat'
symlink(cluster.rttov_srcdir + f_src,
cluster.dart_rundir+'/'+destname)
symlink(cluster.dart_rundir+'/rttov_mfasis_cld_msg_4_seviri_deff.H5',
cluster.dart_rundir+'/rttov_mfasis_cld_msg_4_seviri.H5') # use deff, not OPAC
symlink(cluster.dart_srcdir+'/../../../observations/forward_operators/rttov_sensor_db.csv',
cluster.dart_rundir+'/rttov_sensor_db.csv')
symlink(cluster.dart_srcdir+'/../../../assimilation_code/programs/gen_sampling_err_table/'
+'work/sampling_error_correction_table.nc',
cluster.dart_rundir+'/sampling_error_correction_table.nc')
print('prepared DART & RTTOV links in', cluster.dart_rundir)
except Exception as e:
if any(['sat_channel' in obscfg for obscfg in exp.observations]):
raise e
else:
pass # we dont need RTTOV anyway
def prepare_run_DART_folder():
os.makedirs(cluster.dart_rundir, exist_ok=True) # create directory to run DART in
os.chdir(cluster.dart_rundir)
link_DART_binaries_and_RTTOV_files()
# remove any existing observation files
os.system("rm -f input.nml obs_seq.in obs_seq.out obs_seq.out-orig obs_seq.final")
def main(time, prior_init_time, prior_valid_time, prior_path_exp):
"""Assimilate observations
as defined in config/cfg.py
for a certain timestamp (argument) of the nature run (defined in config/clusters.py)
Workflow:
1) prepare nature run & prior ensemble for DART
2) create obs_seq.in
3) create obs from nature (obs_seq.out) with user-defined obs-errors
4) Assimilate with assigned errors
Args:
assim_time (dt.datetime): time of output
prior_init_time (dt.datetime): forecast start of prior
prior_valid_time (dt.datetime): valid time of prior (may be different to assim_time)
prior_path_exp (str): path to prior experiment
Returns:
None
"""
nproc = cluster.max_nproc
do_QC = getattr(exp, "reject_smallFGD", False) # True: triggers additional evaluations of prior & posterior
# for which observation type do we have a parametrized observation error?
error_is_parametrized = [obscfg["error_assimilate"] == False for obscfg in exp.observations]
prepare_run_DART_folder()
nml = dart_nml.write_namelist()
prior_inflation_type = nml['&filter_nml']['inf_flavor'][0][0]
print("prepare nature")
prepare_nature_dart(time) # link WRF files to DART directory
print("prepare prior ensemble")
prepare_prior_ensemble(time, prior_init_time, prior_valid_time, prior_path_exp)
print(" get observations with specified obs-error")
oso = get_obsseq_out(time)
# is any observation error parametrized?
if any(error_is_parametrized) or do_QC:
print(" (optional) evaluate prior for all observations (incl rejected) ")
evaluate(time, prior=True,
output_format="%Y-%m-%d_%H:%M_obs_seq.final-evaluate_prior")
print(" assign observation-errors for assimilation ")
set_obserr_assimilate_in_obsseqout(oso, outfile=cluster.dart_rundir + "/obs_seq.out")
if do_QC:
print(" reject observations? ")
qc_obs(time, oso)
if prior_inflation_type == '2':
prepare_inflation_2(time, prior_init_time)
print(" run filter ")
dart_nml.write_namelist()
filter(nproc=nproc)
archive_filteroutput(time)
if prior_inflation_type == '2':
archive_inflation_2(time)
print(" evaluate posterior in observation-space")
if do_QC:
f_oso = '%Y-%m-%d_%H:%M_obs_seq.out-beforeQC' # includes all observations (including rejected ones in qc_obs())
else:
f_oso = '%Y-%m-%d_%H:%M_obs_seq.out'
# evaluate() separately after ./filter is crucial when assimilating cloud variables
# as the obs_seq.final returned by ./filter was produced using un-clamped cloud variables
evaluate(time, obs_seq_out=cluster.archivedir+'/obs_seq_out/'+time.strftime(f_oso),
prior=False, posterior=True,
output_format="%Y-%m-%d_%H:%M_obs_seq.final-evaluate_posterior")
if __name__ == "__main__":
"""Assimilate synthetic observations
Example:
python assim_synth_obs.py 2008-08-07_13:00 2008-08_12:00 2008-08-07_13:00 /path/to/experiment/
"""
time = dt.datetime.strptime(sys.argv[1], "%Y-%m-%d_%H:%M")
prior_init_time = dt.datetime.strptime(sys.argv[2], "%Y-%m-%d_%H:%M")
prior_valid_time = dt.datetime.strptime(sys.argv[3], "%Y-%m-%d_%H:%M")
prior_path_exp = str(sys.argv[4])
main(time, prior_init_time, prior_valid_time, prior_path_exp)