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--- | ||
filename: sic_psn25_{year}.*.nc | ||
# Common global attributes for Cmorizer output | ||
attributes: | ||
dataset_id: NSIDC-G02202-nh | ||
version: '5' | ||
tier: 3 | ||
modeling_realm: reanaly | ||
project_id: OBS6 | ||
source: 'https://nsidc.org/data/g02202/versions/5' | ||
reference: 'nsidc-g02202' | ||
comment: '' | ||
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variables: | ||
siconc: | ||
mip: SImon | ||
raw: cdr_seaice_conc_monthly | ||
compress: true | ||
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custom: | ||
create_areacello: true | ||
area_file: psn25area_v3.dat |
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182 changes: 182 additions & 0 deletions
182
esmvaltool/cmorizers/data/formatters/datasets/nsidc_g02202_nh.py
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"""ESMValTool CMORizer for Sea Ice Concentration CDR (Northern Hemisphere). | ||
Tier | ||
Tier 3: restricted dataset. | ||
Source | ||
https://nsidc.org/data/g02202/versions/5 | ||
Last access | ||
20250124 | ||
Download and processing instructions | ||
Download data from: | ||
https://noaadata.apps.nsidc.org/NOAA/G02202_V5/north/monthly | ||
lat and lon from: | ||
https://noaadata.apps.nsidc.org/NOAA/G02202_V5/ancillary/ | ||
area file: | ||
ftp://sidads.colorado.edu/DATASETS/seaice/polar-stereo/tools/ | ||
psn25area_v3.dat | ||
https://nsidc.org/sites/default/files/documents/user-guide/g02202-v005-userguide.pdf | ||
""" | ||
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import logging | ||
import os | ||
import re | ||
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import numpy as np | ||
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import iris | ||
from cf_units import Unit | ||
from iris.coords import AuxCoord | ||
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from esmvaltool.cmorizers.data import utilities as utils | ||
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logger = logging.getLogger(__name__) | ||
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def _get_filepaths(in_dir, basename, yyyy): | ||
"""Find correct name of file (extend basename with timestamp).""" | ||
f_name = basename.format(year=yyyy) | ||
regex = re.compile(f_name) | ||
return_files = [] | ||
for files in os.listdir(in_dir): | ||
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if regex.match(files): | ||
return_files.append(os.path.join(in_dir, files)) | ||
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return return_files | ||
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def _fix_time_coord(cube, _field, _filename): | ||
"""Set time points to central day of month.""" | ||
time_coord = cube.coord('time') | ||
new_unit = Unit('days since 1850-01-01 00:00:00', calendar='standard') | ||
time_coord.convert_units(new_unit) | ||
old_time = new_unit.num2date(time_coord.points) | ||
new_time = [d.replace(day=15) for d in old_time] | ||
time_coord.points = new_unit.date2num(new_time) | ||
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def _prom_dim_coord(cube, _field, _filename): | ||
iris.util.promote_aux_coord_to_dim_coord(cube, 'time') | ||
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def _create_coord(cubes, var_name, standard_name): | ||
cube = cubes.extract_cube(standard_name) | ||
coord = AuxCoord( | ||
cube.data, | ||
standard_name=standard_name, | ||
long_name=cube.long_name, | ||
var_name=var_name, | ||
units='degrees' # cube.units, | ||
) | ||
return coord | ||
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def _extract_variable(raw_var, cmor_info, attrs, filepath, out_dir, latlon): | ||
"""Extract variable from all files.""" | ||
var = cmor_info.short_name | ||
cubes = iris.load(filepath, raw_var, _prom_dim_coord) | ||
iris.util.equalise_attributes(cubes) | ||
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cube = cubes.concatenate_cube() | ||
iris.util.promote_aux_coord_to_dim_coord(cube, 'projection_y_coordinate') | ||
iris.util.promote_aux_coord_to_dim_coord(cube, 'projection_x_coordinate') | ||
cube.coord('projection_y_coordinate').rename('y') | ||
cube.coord('projection_x_coordinate').rename('x') | ||
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cube.add_aux_coord(latlon[0], (1, 2)) | ||
cube.add_aux_coord(latlon[1], (1, 2)) | ||
# add coord typesi | ||
area_type = AuxCoord([1.0], standard_name='area_type', var_name='type', | ||
long_name='Sea Ice area type') | ||
cube.add_aux_coord(area_type) | ||
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# cube.convert_units(cmor_info.units) | ||
cube.units = '%' | ||
cube.data[cube.data > 100] = np.nan | ||
cube = cube * 100 | ||
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# utils.fix_coords(cube) #latlon multidimensional | ||
utils.fix_var_metadata(cube, cmor_info) | ||
utils.set_global_atts(cube, attrs) | ||
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utils.save_variable(cube, | ||
var, | ||
out_dir, | ||
attrs, | ||
unlimited_dimensions=['time']) | ||
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return cube | ||
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def _create_areacello(cfg, in_dir, sample_cube, glob_attrs, out_dir): | ||
if not cfg['custom'].get('create_areacello', False): | ||
return | ||
var_info = cfg['cmor_table'].get_variable('Ofx', 'areacello') | ||
glob_attrs['mip'] = 'Ofx' | ||
lat_coord = sample_cube.coord('latitude') | ||
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area_file = os.path.join(in_dir, cfg['custom']['area_file']) | ||
with open(area_file, 'rb') as datfile: | ||
areasdmnd = np.fromfile(datfile, | ||
dtype=np.int32).reshape(lat_coord.shape) | ||
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# Divide by 1000 to get km2 then multiply by 1e6 to m2 ...*1000 | ||
ardata = areasdmnd * 1000 | ||
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cube = iris.cube.Cube(ardata, | ||
standard_name=var_info.standard_name, | ||
long_name=var_info.long_name, | ||
var_name=var_info.short_name, | ||
units='m2', | ||
dim_coords_and_dims=[(sample_cube.coord('y'), 0), | ||
(sample_cube.coord('x'), 1)]) | ||
cube.add_aux_coord(lat_coord, (0, 1)) | ||
cube.add_aux_coord(sample_cube.coord('longitude'), (0, 1)) | ||
utils.fix_var_metadata(cube, var_info) | ||
utils.set_global_atts(cube, glob_attrs) | ||
utils.save_variable(cube, var_info.short_name, out_dir, glob_attrs, | ||
zlib=True) | ||
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def cmorization(in_dir, out_dir, cfg, cfg_user, start_date, end_date): | ||
"""Cmorization func call.""" | ||
glob_attrs = cfg['attributes'] | ||
cmor_table = cfg['cmor_table'] | ||
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# get aux nc file | ||
cubesaux = iris.load(os.path.join(in_dir, 'G02202-ancillary-psn25-v05r00.nc')) | ||
lat_coord = _create_coord(cubesaux, 'lat', 'latitude') | ||
lon_coord = _create_coord(cubesaux, 'lon', 'longitude') | ||
year = 1978 | ||
# split by year.. | ||
sample_cube = None | ||
for year in range(1979, 2025, 1): | ||
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filepaths = _get_filepaths(in_dir, cfg['filename'], year) | ||
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if len(filepaths) > 0: | ||
logger.info("Found %d files in '%s'", len(filepaths), in_dir) | ||
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for (var, var_info) in cfg['variables'].items(): | ||
logger.info("CMORizing variable '%s'", var) | ||
glob_attrs['mip'] = var_info['mip'] | ||
cmor_info = cmor_table.get_variable(var_info['mip'], var) | ||
raw_var = var_info.get('raw', var) | ||
sample_cube = _extract_variable(raw_var, cmor_info, | ||
glob_attrs, filepaths, | ||
out_dir, [lat_coord, | ||
lon_coord]) | ||
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else: | ||
logger.info("No files found ") | ||
logger.info("year: %d basename: %s", year, cfg['filename']) | ||
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year += 1 | ||
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if sample_cube is not None: | ||
_create_areacello(cfg, in_dir, sample_cube, glob_attrs, out_dir) |
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