%load_ext autoreload
%autoreload 2

Examples of CORDEX-CMIP6 cmorization

This notebook should show some examples of how a cmorized CORDEX-CMIP6 dataset could look like.

!ls ../Tables

CORDEX-CMIP6_1hr.json	      CORDEX-CMIP6_formula_terms.json
CORDEX-CMIP6_6hr.json	      CORDEX-CMIP6_fx.json
CORDEX-CMIP6_CV.json	      CORDEX-CMIP6_grids.json
CORDEX-CMIP6_coordinate.json  CORDEX-CMIP6_mon.json
CORDEX-CMIP6_day.json	      CORDEX-CMIP6_remo_example.json

Controlled Vocabulary

The current CORDEX-CMIP6_CV.json file contains the controlled vocabulary used by the CMOR3 library for rewriting the model output. Let’s have a look:

import json
import pprint

from IPython.display import JSON

# Opening JSON file
with open("../Tables/CORDEX-CMIP6_CV.json") as json_file:
    CV = json.load(json_file)["CV"]

# JSON(CV['required_global_attributes'])
pprint.pprint(CV["required_global_attributes"])

['activity_id',
 'contact',
 'Conventions',
 'creation_date',
 'domain_id',
 'domain',
 'driving_experiment_id',
 'driving_experiment',
 'driving_institution_id',
 'driving_source_id',
 'driving_variant_label',
 'frequency',
 'grid',
 'institution',
 'institution_id',
 'license',
 'mip_era',
 'product',
 'project_id',
 'source',
 'source_id',
 'source_type',
 'tracking_id',
 'variable_id',
 'version_realization']

Cmorization example

We use the cordex.cmor module to create an example of a CORDEX-CMIP6 dataset.

Show code cell source

Hide code cell source

import os

import cordex as cx
import xarray as xr
from cordex import cmor as cmor

table_dir = "../Tables"

cmor.set_options(table_prefix="CORDEX-CMIP6")


def test_cmorizer_fx():
    ds = cx.cordex_domain("EUR-11", dummy="topo")
    filename = cmor.cmorize_variable(
        ds,
        "orog",
        mapping_table={"orog": {"varname": "topo"}},
        cmor_table=os.path.join(table_dir, "CORDEX-CMIP6_fx.json"),
        dataset_table=os.path.join(table_dir, "CORDEX-CMIP6_remo_example.json"),
        grids_table=os.path.join(table_dir, "CORDEX-CMIP6_grids.json"),
        CORDEX_domain="EUR-11",
        time_units=None,
        allow_units_convert=True,
    )
    return filename


def test_cmorizer_mon():
    ds = cx.tutorial.open_dataset("remo_EUR-11_TEMP2_mon")
    filename = cmor.cmorize_variable(
        ds,
        "tas",
        mapping_table={"tas": {"varname": "TEMP2"}},
        cmor_table=os.path.join(table_dir, "CORDEX-CMIP6_mon.json"),
        dataset_table=os.path.join(table_dir, "CORDEX-CMIP6_remo_example.json"),
        grids_table=os.path.join(table_dir, "CORDEX-CMIP6_grids.json"),
        CORDEX_domain="EUR-11",
        time_units=None,
        allow_units_convert=True,
    )
    return filename


def test_cmorizer_subdaily(table):
    ds = cx.tutorial.open_dataset("remo_EUR-11_TEMP2_1hr")
    filename = cmor.cmorize_variable(
        ds,
        "tas",
        mapping_table={"tas": {"varname": "TEMP2"}},
        cmor_table=os.path.join(table_dir, f"CORDEX-CMIP6_{table}.json"),
        dataset_table=os.path.join(table_dir, "CORDEX-CMIP6_remo_example.json"),
        grids_table=os.path.join(table_dir, "CORDEX-CMIP6_grids.json"),
        CORDEX_domain="EUR-11",
        time_units=None,
        allow_units_convert=True,
        allow_resample=True,
    )
    return filename

Example from fx table

f = test_cmorizer_fx()

Let’s have a look at the filename.

f

'CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/fx/orog/v20260216/orog_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_fx.nc'

!ncdump -h $f

netcdf orog_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_fx {
dimensions:
	rlat = 412 ;
	rlon = 424 ;
	bnds = 2 ;
	vertices = 4 ;
variables:
	double rlat(rlat) ;
		rlat:units = "degrees" ;
		rlat:axis = "Y" ;
		rlat:long_name = "latitude in rotated pole grid" ;
		rlat:standard_name = "grid_latitude" ;
	double rlon(rlon) ;
		rlon:units = "degrees" ;
		rlon:axis = "X" ;
		rlon:long_name = "longitude in rotated pole grid" ;
		rlon:standard_name = "grid_longitude" ;
	int rotated_latitude_longitude ;
		rotated_latitude_longitude:grid_mapping_name = "rotated_latitude_longitude" ;
		rotated_latitude_longitude:grid_north_pole_latitude = 39.25 ;
		rotated_latitude_longitude:grid_north_pole_longitude = -162. ;
		rotated_latitude_longitude:north_pole_grid_longitude = 0. ;
		rotated_latitude_longitude:earth_radius = 6371229. ;
	double lat(rlat, rlon) ;
		lat:standard_name = "latitude" ;
		lat:long_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:missing_value = 1.e+20 ;
		lat:_FillValue = 1.e+20 ;
		lat:bounds = "vertices_lat" ;
	double lon(rlat, rlon) ;
		lon:standard_name = "longitude" ;
		lon:long_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:missing_value = 1.e+20 ;
		lon:_FillValue = 1.e+20 ;
		lon:bounds = "vertices_lon" ;
	double vertices_lat(rlat, rlon, vertices) ;
		vertices_lat:units = "degrees_north" ;
		vertices_lat:missing_value = 1.e+20 ;
		vertices_lat:_FillValue = 1.e+20 ;
	double vertices_lon(rlat, rlon, vertices) ;
		vertices_lon:units = "degrees_east" ;
		vertices_lon:missing_value = 1.e+20 ;
		vertices_lon:_FillValue = 1.e+20 ;
	float orog(rlat, rlon) ;
		orog:standard_name = "surface_altitude" ;
		orog:long_name = "Surface Altitude" ;
		orog:comment = "The surface called \'surface\' means the lower boundary of the atmosphere. Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level." ;
		orog:units = "m" ;
		orog:cell_methods = "area: mean" ;
		orog:cell_measures = "area: areacella" ;
		orog:missing_value = 1.e+20f ;
		orog:_FillValue = 1.e+20f ;
		orog:grid_mapping = "rotated_latitude_longitude" ;
		orog:coordinates = "lat lon" ;

// global attributes:
		:Conventions = "CF-1.11" ;
		:activity_id = "DD" ;
		:contact = "gerics-cordex@hereon.de" ;
		:creation_date = "2026-02-16T13:45:56Z" ;
		:domain = "Europe" ;
		:domain_id = "EUR-12" ;
		:driving_experiment = "reanalysis simulation of the recent past" ;
		:driving_experiment_id = "evaluation" ;
		:driving_institution_id = "ECMWF" ;
		:driving_source = "ECMWF Reanalysis v5" ;
		:driving_source_id = "ERA5" ;
		:driving_variant_label = "r1i1p1f1" ;
		:experiment_id = "evaluation" ;
		:external_variables = "areacella" ;
		:frequency = "fx" ;
		:grid = "Rotated-pole latitude-longitude with 0.11 degree grid spacing" ;
		:history = "2026-02-16T13:45:56Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable orog found in table fx." ;
		:institution = "Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany" ;
		:institution_id = "GERICS" ;
		:label = "REMO2020 v2.2" ;
		:mip_era = "CMIP6" ;
		:product = "model-output" ;
		:project_id = "CORDEX-CMIP6" ;
		:references = "https://www.remo-rcm.de" ;
		:run_variant = "1st realization" ;
		:source = "Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)" ;
		:source_id = "REMO2020-2-2" ;
		:source_type = "ARCM" ;
		:table_id = "fx" ;
		:table_info = "Creation Date:(16 February 2026) MD5:4b04fbc4845a236cf80f078dedeb12fe" ;
		:title = "REMO2020-2-2 output prepared for CMIP6" ;
		:tracking_id = "hdl:21.14103/d49f15c3-0c6b-4179-88d9-80f3cb845d31" ;
		:variable_id = "orog" ;
		:version_realization = "v1-r1" ;
		:license = "https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use" ;
		:cmor_version = "3.14.0" ;
}

The xarray dataset representation allows to explore the dataset interactively.

ds = xr.open_dataset(f)
ds

<xarray.Dataset> Size: 15MB
Dimensions:                     (rlat: 412, rlon: 424, vertices: 4)
Coordinates:
  * rlat                        (rlat) float64 3kB -23.38 -23.27 ... 21.73 21.84
  * rlon                        (rlon) float64 3kB -28.38 -28.27 ... 18.05 18.16
    lat                         (rlat, rlon) float64 1MB ...
    lon                         (rlat, rlon) float64 1MB ...
Dimensions without coordinates: vertices
Data variables:
    rotated_latitude_longitude  int32 4B ...
    vertices_lat                (rlat, rlon, vertices) float64 6MB ...
    vertices_lon                (rlat, rlon, vertices) float64 6MB ...
    orog                        (rlat, rlon) float32 699kB ...
Attributes: (12/36)
    Conventions:             CF-1.11
    activity_id:             DD
    contact:                 gerics-cordex@hereon.de
    creation_date:           2026-02-16T13:45:56Z
    domain:                  Europe
    domain_id:               EUR-12
    ...                      ...
    title:                   REMO2020-2-2 output prepared for CMIP6
    tracking_id:             hdl:21.14103/d49f15c3-0c6b-4179-88d9-80f3cb845d31
    variable_id:             orog
    version_realization:     v1-r1
    license:                 https://cordex.org/data-access/cordex-cmip6-data...
    cmor_version:            3.14.0

xarray.Dataset

• Dimensions:
  • rlat: 412
  • rlon: 424
  • vertices: 4
• Coordinates: (4)
  • rlat
    (rlat)
    float64
    -23.38 -23.27 ... 21.73 21.84

    units :

    degrees

    axis :

    Y

    long_name :

    latitude in rotated pole grid

    standard_name :

    grid_latitude

    array([-23.375, -23.265, -23.155, ...,  21.615,  21.725,  21.835], shape=(412,))

  • rlon
    (rlon)
    float64
    -28.38 -28.27 ... 18.05 18.16

    units :

    degrees

    axis :

    X

    long_name :

    longitude in rotated pole grid

    standard_name :

    grid_longitude

    array([-28.375, -28.265, -28.155, ...,  17.935,  18.045,  18.155], shape=(424,))

  • lat
    (rlat, rlon)
    float64
    ...

    standard_name :

    latitude

    long_name :

    latitude

    units :

    degrees_north

    bounds :

    vertices_lat

    [174688 values with dtype=float64]

  • lon
    (rlat, rlon)
    float64
    ...

    standard_name :

    longitude

    long_name :

    longitude

    units :

    degrees_east

    bounds :

    vertices_lon

    [174688 values with dtype=float64]

• Data variables: (4)
  • rotated_latitude_longitude
    ()
    int32
    ...

    grid_mapping_name :

    rotated_latitude_longitude

    grid_north_pole_latitude :

    39.25

    grid_north_pole_longitude :

    -162.0

    north_pole_grid_longitude :

    0.0

    earth_radius :

    6371229.0

    [1 values with dtype=int32]

  • vertices_lat
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_north

    [698752 values with dtype=float64]

  • vertices_lon
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_east

    [698752 values with dtype=float64]

  • orog
    (rlat, rlon)
    float32
    ...

    standard_name :

    surface_altitude

    long_name :

    Surface Altitude

    comment :

    The surface called 'surface' means the lower boundary of the atmosphere. Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level.

    units :

    m

    cell_methods :

    area: mean

    cell_measures :

    area: areacella

    grid_mapping :

    rotated_latitude_longitude

    [174688 values with dtype=float32]

• Attributes: (36)

  Conventions :

  CF-1.11

  activity_id :

  DD

  contact :

  gerics-cordex@hereon.de

  creation_date :

  2026-02-16T13:45:56Z

  domain :

  Europe

  domain_id :

  EUR-12

  driving_experiment :

  reanalysis simulation of the recent past

  driving_experiment_id :

  evaluation

  driving_institution_id :

  ECMWF

  driving_source :

  ECMWF Reanalysis v5

  driving_source_id :

  ERA5

  driving_variant_label :

  r1i1p1f1

  experiment_id :

  evaluation

  external_variables :

  areacella

  frequency :

  fx

  grid :

  Rotated-pole latitude-longitude with 0.11 degree grid spacing

  history :

  2026-02-16T13:45:56Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable orog found in table fx.

  institution :

  Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany

  institution_id :

  GERICS

  label :

  REMO2020 v2.2

  mip_era :

  CMIP6

  product :

  model-output

  project_id :

  CORDEX-CMIP6

  references :

  https://www.remo-rcm.de

  run_variant :

  1st realization

  source :

  Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)

  source_id :

  REMO2020-2-2

  source_type :

  ARCM

  table_id :

  fx

  table_info :

  Creation Date:(16 February 2026) MD5:4b04fbc4845a236cf80f078dedeb12fe

  title :

  REMO2020-2-2 output prepared for CMIP6

  tracking_id :

  hdl:21.14103/d49f15c3-0c6b-4179-88d9-80f3cb845d31

  variable_id :

  orog

  version_realization :

  v1-r1

  license :

  https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use

  cmor_version :

  3.14.0

ds.orog.plot()

<matplotlib.collections.QuadMesh at 0x7fa2d18f6c90>

!cdo verifygrid $f

cdo    verifygrid: Grid consists of 174688 (424x412) cells (type: curvilinear), of which

cdo    verifygrid:    174688 cells have 4 vertices
cdo    verifygrid:        lon : -44.59386 to 64.96438 degrees
cdo    verifygrid:        lat : 21.98783 to 72.585 degrees
cdo    verifygrid: Processed 1 variable [0.11s 672MB]

!cfchecks $f

CHECKING NetCDF FILE: CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/fx/orog/v20260216/orog_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_fx.nc
=====================

Using CF Checker Version 4.1.0
Checking against CF Version CF-1.8
Using Standard Name Table Version 92 (2025-07-24T14:20:46Z)
Using Area Type Table Version 13 (20 March 2025)
Using Standardized Region Name Table Version 5 (12 November 2024)

ERROR: (2.6.1): This netCDF file does not appear to contain CF Convention data.
WARN: (7.1): Boundary var vertices_lat should not have attribute units
WARN: (7.1): Boundary var vertices_lon should not have attribute units

------------------
Checking variable: rlat
------------------

------------------
Checking variable: rlon
------------------

------------------
Checking variable: rotated_latitude_longitude
------------------

------------------
Checking variable: lat
------------------

------------------
Checking variable: lon
------------------

------------------
Checking variable: vertices_lat
------------------
WARN: (7.1): Boundary Variable vertices_lat should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lat should not have missing_value attribute

------------------
Checking variable: vertices_lon
------------------
WARN: (7.1): Boundary Variable vertices_lon should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lon should not have missing_value attribute

------------------
Checking variable: orog
------------------

ERRORS detected: 1
WARNINGS given: 6
INFORMATION messages: 0

!compliance-checker --test=cf:1.7 $f

Running Compliance Checker on the datasets from: ['CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/fx/orog/v20260216/orog_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_fx.nc']

--------------------------------------------------------------------------------
                         IOOS Compliance Checker Report                         
                                 Version 5.4.2                                  
                     Report generated 2026-02-16T13:46:01Z                      
                                     cf:1.7                                     
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html
--------------------------------------------------------------------------------
                               Corrective Actions                               
orog_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_fx.nc has 2 potential issues


                                    Warnings                                    
--------------------------------------------------------------------------------
§2.6 Attributes
* §2.6.1 Conventions global attribute does not contain "CF-1.7"

§7.1 Cell Boundaries
* The Boundary variables 'vertices_lat' should not have the attributes: '['units', 'missing_value', '_FillValue']'
* The Boundary variables 'vertices_lon' should not have the attributes: '['units', 'missing_value', '_FillValue']'
WARNING: The following exceptions occurred during the cf:1.7 checker (possibly indicate compliance checker issues):
cf:1.7.check_cell_boundaries_interval: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Example from mon table

f = test_cmorizer_mon()
f

Downloading data from 'https://github.com/euro-cordex/py-cordex-data/raw/main/remo_EUR-11_TEMP2_mon.nc' to file '/home/runner/.cache/py-cordex_tutorial_data/6d6ccde2e368653ce62a71c80e75f890-remo_EUR-11_TEMP2_mon.nc'.

SHA256 hash of downloaded file: a585a11475492241a7a52963bbdf323af185163166e52924f1a04b4ff91b3ae6
Use this value as the 'known_hash' argument of 'pooch.retrieve' to ensure that the file hasn't changed if it is downloaded again in the future.

/tmp/ipykernel_3707/3805428128.py:30: DeprecationWarning: 'CORDEX_domain' keyword is deprecated, please use the 'domain_id' keyword instead
  filename = cmor.cmorize_variable(
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:635: UserWarning: adding time bounds
  warn("adding time bounds")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:426: UserWarning: time units are set to default: days since 1950-01-01T00:00:00
  warn(f"time units are set to default: {u}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/utils.py:334: UserWarning: writing temporary table to /tmp/tmp6vstjeeb
  warn(f"writing temporary table to {filename}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:321: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  x_bnds = bnds.cf.get_bounds("X").drop(bnds.cf.bounds["X"])
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:322: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  y_bnds = bnds.cf.get_bounds("Y").drop(bnds.cf.bounds["Y"])

/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})

C Traceback:
In function: cmor_values_from_bounds
! called from: cmor_axis
! 

!!!!!!!!!!!!!!!!!!!!!!!!!
!
! Warning: The values you provided for axis time are different from those computed from the bounds, which are used for the axis values instead of the user-provided values.
!
! The first value found is at index 0: 18276.000000 will be replaced with 18277.500000 between bounds 18262.000000 and 18293.000000
!
!!!!!!!!!!!!!!!!!!!!!!!!!

'CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/mon/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_mon_200001-200012.nc'

ds = xr.open_dataset(f)
ds

<xarray.Dataset> Size: 22MB
Dimensions:                     (time: 12, bnds: 2, rlat: 412, rlon: 424,
                                 vertices: 4)
Coordinates:
  * time                        (time) datetime64[ns] 96B 2000-01-16T12:00:00...
  * rlat                        (rlat) float64 3kB -23.38 -23.27 ... 21.73 21.84
  * rlon                        (rlon) float64 3kB -28.38 -28.27 ... 18.05 18.16
    lat                         (rlat, rlon) float64 1MB ...
    lon                         (rlat, rlon) float64 1MB ...
    height                      float64 8B ...
Dimensions without coordinates: bnds, vertices
Data variables:
    time_bnds                   (time, bnds) datetime64[ns] 192B ...
    rotated_latitude_longitude  int32 4B ...
    vertices_lat                (rlat, rlon, vertices) float64 6MB ...
    vertices_lon                (rlat, rlon, vertices) float64 6MB ...
    tas                         (time, rlat, rlon) float32 8MB ...
Attributes: (12/36)
    Conventions:             CF-1.11
    activity_id:             DD
    contact:                 gerics-cordex@hereon.de
    creation_date:           2026-02-16T13:46:02Z
    domain:                  Europe
    domain_id:               EUR-12
    ...                      ...
    title:                   REMO2020-2-2 output prepared for CMIP6
    tracking_id:             hdl:21.14103/bdfc3274-3b74-4f43-8a2c-71c57fde7872
    variable_id:             tas
    version_realization:     v1-r1
    license:                 https://cordex.org/data-access/cordex-cmip6-data...
    cmor_version:            3.14.0

xarray.Dataset

• Dimensions:
  • time: 12
  • bnds: 2
  • rlat: 412
  • rlon: 424
  • vertices: 4
• Coordinates: (6)
  • time
    (time)
    datetime64[ns]
    2000-01-16T12:00:00 ... 2000-12-...

    bounds :

    time_bnds

    axis :

    T

    long_name :

    time

    standard_name :

    time

    array(['2000-01-16T12:00:00.000000000', '2000-02-15T12:00:00.000000000',
           '2000-03-16T12:00:00.000000000', '2000-04-16T00:00:00.000000000',
           '2000-05-16T12:00:00.000000000', '2000-06-16T00:00:00.000000000',
           '2000-07-16T12:00:00.000000000', '2000-08-16T12:00:00.000000000',
           '2000-09-16T00:00:00.000000000', '2000-10-16T12:00:00.000000000',
           '2000-11-16T00:00:00.000000000', '2000-12-16T12:00:00.000000000'],
          dtype='datetime64[ns]')

  • rlat
    (rlat)
    float64
    -23.38 -23.27 ... 21.73 21.84

    units :

    degrees

    axis :

    Y

    long_name :

    latitude in rotated pole grid

    standard_name :

    grid_latitude

    array([-23.375, -23.265, -23.155, ...,  21.615,  21.725,  21.835], shape=(412,))

  • rlon
    (rlon)
    float64
    -28.38 -28.27 ... 18.05 18.16

    units :

    degrees

    axis :

    X

    long_name :

    longitude in rotated pole grid

    standard_name :

    grid_longitude

    array([-28.375, -28.265, -28.155, ...,  17.935,  18.045,  18.155], shape=(424,))

  • lat
    (rlat, rlon)
    float64
    ...

    standard_name :

    latitude

    long_name :

    latitude

    units :

    degrees_north

    bounds :

    vertices_lat

    [174688 values with dtype=float64]

  • lon
    (rlat, rlon)
    float64
    ...

    standard_name :

    longitude

    long_name :

    longitude

    units :

    degrees_east

    bounds :

    vertices_lon

    [174688 values with dtype=float64]

  • height
    ()
    float64
    ...

    units :

    m

    axis :

    Z

    positive :

    up

    long_name :

    height

    standard_name :

    height

    [1 values with dtype=float64]

• Data variables: (5)
  • time_bnds
    (time, bnds)
    datetime64[ns]
    ...

    [24 values with dtype=datetime64[ns]]

  • rotated_latitude_longitude
    ()
    int32
    ...

    grid_mapping_name :

    rotated_latitude_longitude

    grid_north_pole_latitude :

    39.25

    grid_north_pole_longitude :

    -162.0

    north_pole_grid_longitude :

    0.0

    earth_radius :

    6371229.0

    [1 values with dtype=int32]

  • vertices_lat
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_north

    [698752 values with dtype=float64]

  • vertices_lon
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_east

    [698752 values with dtype=float64]

  • tas
    (time, rlat, rlon)
    float32
    ...

    standard_name :

    air_temperature

    long_name :

    Near-Surface Air Temperature

    comment :

    near-surface (usually, 2 meter) air temperature

    units :

    K

    cell_methods :

    area: time: mean

    cell_measures :

    area: areacella

    history :

    2026-02-16T13:46:02Z altered by CMOR: Treated scalar dimension: 'height'.

    grid_mapping :

    rotated_latitude_longitude

    [2096256 values with dtype=float32]

• Attributes: (36)

  Conventions :

  CF-1.11

  activity_id :

  DD

  contact :

  gerics-cordex@hereon.de

  creation_date :

  2026-02-16T13:46:02Z

  domain :

  Europe

  domain_id :

  EUR-12

  driving_experiment :

  reanalysis simulation of the recent past

  driving_experiment_id :

  evaluation

  driving_institution_id :

  ECMWF

  driving_source :

  ECMWF Reanalysis v5

  driving_source_id :

  ERA5

  driving_variant_label :

  r1i1p1f1

  experiment_id :

  evaluation

  external_variables :

  areacella

  frequency :

  mon

  grid :

  Rotated-pole latitude-longitude with 0.11 degree grid spacing

  history :

  2026-02-16T13:46:02Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table mon.

  institution :

  Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany

  institution_id :

  GERICS

  label :

  REMO2020 v2.2

  mip_era :

  CMIP6

  product :

  model-output

  project_id :

  CORDEX-CMIP6

  references :

  https://www.remo-rcm.de

  run_variant :

  1st realization

  source :

  Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)

  source_id :

  REMO2020-2-2

  source_type :

  ARCM

  table_id :

  mon

  table_info :

  Creation Date:(16 February 2026) MD5:ecaaa2fa2dab44b1aa6b6bfdc08c6093

  title :

  REMO2020-2-2 output prepared for CMIP6

  tracking_id :

  hdl:21.14103/bdfc3274-3b74-4f43-8a2c-71c57fde7872

  variable_id :

  tas

  version_realization :

  v1-r1

  license :

  https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use

  cmor_version :

  3.14.0

ds.cf

Coordinates:
             CF Axes: * X: ['rlon']
                      * Y: ['rlat']
                        Z: ['height']
                      * T: ['time']

      CF Coordinates:   longitude: ['lon']
                        latitude: ['lat']
                        vertical: ['height']
                      * time: ['time']

       Cell Measures:   area, volume: n/a

      Standard Names: * grid_latitude: ['rlat']
                      * grid_longitude: ['rlon']
                        height: ['height']
                        latitude: ['lat']
                        longitude: ['lon']
                      * time: ['time']

              Bounds:   n/a

       Grid Mappings:   n/a

Data Variables:
       Cell Measures:   area, volume: n/a

      Standard Names:   air_temperature: ['tas']

              Bounds:   T: ['time_bnds']
                        lat: ['vertices_lat']
                        latitude: ['vertices_lat']
                        lon: ['vertices_lon']
                        longitude: ['vertices_lon']
                        time: ['time_bnds']

       Grid Mappings:   rotated_latitude_longitude: ['rotated_latitude_longitude']

ds.tas.plot(col="time", col_wrap=4)

<xarray.plot.facetgrid.FacetGrid at 0x7fa2d19258b0>

!ncdump -h $f

netcdf tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_mon_200001-200012 {
dimensions:
	time = UNLIMITED ; // (12 currently)
	rlat = 412 ;
	rlon = 424 ;
	bnds = 2 ;
	vertices = 4 ;
variables:
	double time(time) ;
		time:bounds = "time_bnds" ;
		time:units = "days since 1950-01-01T00:00:00" ;
		time:calendar = "proleptic_gregorian" ;
		time:axis = "T" ;
		time:long_name = "time" ;
		time:standard_name = "time" ;
	double time_bnds(time, bnds) ;
	double rlat(rlat) ;
		rlat:units = "degrees" ;
		rlat:axis = "Y" ;
		rlat:long_name = "latitude in rotated pole grid" ;
		rlat:standard_name = "grid_latitude" ;
	double rlon(rlon) ;
		rlon:units = "degrees" ;
		rlon:axis = "X" ;
		rlon:long_name = "longitude in rotated pole grid" ;
		rlon:standard_name = "grid_longitude" ;
	int rotated_latitude_longitude ;
		rotated_latitude_longitude:grid_mapping_name = "rotated_latitude_longitude" ;
		rotated_latitude_longitude:grid_north_pole_latitude = 39.25 ;
		rotated_latitude_longitude:grid_north_pole_longitude = -162. ;
		rotated_latitude_longitude:north_pole_grid_longitude = 0. ;
		rotated_latitude_longitude:earth_radius = 6371229. ;
	double lat(rlat, rlon) ;
		lat:standard_name = "latitude" ;
		lat:long_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:missing_value = 1.e+20 ;
		lat:_FillValue = 1.e+20 ;
		lat:bounds = "vertices_lat" ;
	double lon(rlat, rlon) ;
		lon:standard_name = "longitude" ;
		lon:long_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:missing_value = 1.e+20 ;
		lon:_FillValue = 1.e+20 ;
		lon:bounds = "vertices_lon" ;
	double vertices_lat(rlat, rlon, vertices) ;
		vertices_lat:units = "degrees_north" ;
		vertices_lat:missing_value = 1.e+20 ;
		vertices_lat:_FillValue = 1.e+20 ;
	double vertices_lon(rlat, rlon, vertices) ;
		vertices_lon:units = "degrees_east" ;
		vertices_lon:missing_value = 1.e+20 ;
		vertices_lon:_FillValue = 1.e+20 ;
	double height ;
		height:units = "m" ;
		height:axis = "Z" ;
		height:positive = "up" ;
		height:long_name = "height" ;
		height:standard_name = "height" ;
	float tas(time, rlat, rlon) ;
		tas:standard_name = "air_temperature" ;
		tas:long_name = "Near-Surface Air Temperature" ;
		tas:comment = "near-surface (usually, 2 meter) air temperature" ;
		tas:units = "K" ;
		tas:cell_methods = "area: time: mean" ;
		tas:cell_measures = "area: areacella" ;
		tas:history = "2026-02-16T13:46:02Z altered by CMOR: Treated scalar dimension: \'height\'." ;
		tas:coordinates = "height lat lon" ;
		tas:missing_value = 1.e+20f ;
		tas:_FillValue = 1.e+20f ;
		tas:grid_mapping = "rotated_latitude_longitude" ;

// global attributes:
		:Conventions = "CF-1.11" ;
		:activity_id = "DD" ;
		:contact = "gerics-cordex@hereon.de" ;
		:creation_date = "2026-02-16T13:46:02Z" ;
		:domain = "Europe" ;
		:domain_id = "EUR-12" ;
		:driving_experiment = "reanalysis simulation of the recent past" ;
		:driving_experiment_id = "evaluation" ;
		:driving_institution_id = "ECMWF" ;
		:driving_source = "ECMWF Reanalysis v5" ;
		:driving_source_id = "ERA5" ;
		:driving_variant_label = "r1i1p1f1" ;
		:experiment_id = "evaluation" ;
		:external_variables = "areacella" ;
		:frequency = "mon" ;
		:grid = "Rotated-pole latitude-longitude with 0.11 degree grid spacing" ;
		:history = "2026-02-16T13:46:02Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table mon." ;
		:institution = "Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany" ;
		:institution_id = "GERICS" ;
		:label = "REMO2020 v2.2" ;
		:mip_era = "CMIP6" ;
		:product = "model-output" ;
		:project_id = "CORDEX-CMIP6" ;
		:references = "https://www.remo-rcm.de" ;
		:run_variant = "1st realization" ;
		:source = "Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)" ;
		:source_id = "REMO2020-2-2" ;
		:source_type = "ARCM" ;
		:table_id = "mon" ;
		:table_info = "Creation Date:(16 February 2026) MD5:ecaaa2fa2dab44b1aa6b6bfdc08c6093" ;
		:title = "REMO2020-2-2 output prepared for CMIP6" ;
		:tracking_id = "hdl:21.14103/bdfc3274-3b74-4f43-8a2c-71c57fde7872" ;
		:variable_id = "tas" ;
		:version_realization = "v1-r1" ;
		:license = "https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use" ;
		:cmor_version = "3.14.0" ;
}

!cfchecks $f

CHECKING NetCDF FILE: CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/mon/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_mon_200001-200012.nc
=====================

Using CF Checker Version 4.1.0
Checking against CF Version CF-1.8
Using Standard Name Table Version 92 (2025-07-24T14:20:46Z)
Using Area Type Table Version 13 (20 March 2025)
Using Standardized Region Name Table Version 5 (12 November 2024)

ERROR: (2.6.1): This netCDF file does not appear to contain CF Convention data.
WARN: (7.1): Boundary var vertices_lat should not have attribute units
WARN: (7.1): Boundary var vertices_lon should not have attribute units

------------------
Checking variable: time
------------------

------------------
Checking variable: time_bnds
------------------

------------------
Checking variable: rlat
------------------

------------------
Checking variable: rlon
------------------

------------------
Checking variable: rotated_latitude_longitude
------------------

------------------
Checking variable: lat
------------------

------------------
Checking variable: lon
------------------

------------------
Checking variable: vertices_lat
------------------
WARN: (7.1): Boundary Variable vertices_lat should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lat should not have missing_value attribute

------------------
Checking variable: vertices_lon
------------------
WARN: (7.1): Boundary Variable vertices_lon should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lon should not have missing_value attribute

------------------
Checking variable: height
------------------

------------------
Checking variable: tas
------------------
INFO: attribute history is being used in a non-standard way

ERRORS detected: 1
WARNINGS given: 6
INFORMATION messages: 1

!compliance-checker --test=cf:1.7 $f

Running Compliance Checker on the datasets from: ['CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/mon/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_mon_200001-200012.nc']

--------------------------------------------------------------------------------
                         IOOS Compliance Checker Report                         
                                 Version 5.4.2                                  
                     Report generated 2026-02-16T13:46:08Z                      
                                     cf:1.7                                     
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html
--------------------------------------------------------------------------------
                               Corrective Actions                               
tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_mon_200001-200012.nc has 2 potential issues


                                    Warnings                                    
--------------------------------------------------------------------------------
§2.6 Attributes
* §2.6.1 Conventions global attribute does not contain "CF-1.7"

§7.1 Cell Boundaries
* The Boundary variables 'vertices_lat' should not have the attributes: '['units', 'missing_value', '_FillValue']'
* The Boundary variables 'vertices_lon' should not have the attributes: '['units', 'missing_value', '_FillValue']'

Example from daily and subdaily tables

f = test_cmorizer_subdaily("1hr")
f

Downloading data from 'https://github.com/euro-cordex/py-cordex-data/raw/main/remo_EUR-11_TEMP2_1hr.nc' to file '/home/runner/.cache/py-cordex_tutorial_data/df1ad3551d1e9e1f102d1a1536d5212c-remo_EUR-11_TEMP2_1hr.nc'.

SHA256 hash of downloaded file: 0ddd4c71be010a5656ed624aa6bfd3c3fa6238d8c61c9f39b1494c4188f060a8
Use this value as the 'known_hash' argument of 'pooch.retrieve' to ensure that the file hasn't changed if it is downloaded again in the future.

/tmp/ipykernel_3707/3805428128.py:46: DeprecationWarning: 'CORDEX_domain' keyword is deprecated, please use the 'domain_id' keyword instead
  filename = cmor.cmorize_variable(
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:517: UserWarning: resampling input data from H to h
  warn(f"resampling input data from {input_freq} to {pd_freq}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:426: UserWarning: time units are set to default: days since 1950-01-01T00:00:00
  warn(f"time units are set to default: {u}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/utils.py:334: UserWarning: writing temporary table to /tmp/tmpbhslnhzv
  warn(f"writing temporary table to {filename}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:321: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  x_bnds = bnds.cf.get_bounds("X").drop(bnds.cf.bounds["X"])
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:322: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  y_bnds = bnds.cf.get_bounds("Y").drop(bnds.cf.bounds["Y"])

/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})

'CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/1hr/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_1hr_200001010000-200001030000.nc'

ds = xr.open_dataset(f)
ds

<xarray.Dataset> Size: 48MB
Dimensions:                     (rlat: 412, rlon: 424, vertices: 4, time: 49)
Coordinates:
  * rlat                        (rlat) float64 3kB -23.38 -23.27 ... 21.73 21.84
  * rlon                        (rlon) float64 3kB -28.38 -28.27 ... 18.05 18.16
    lat                         (rlat, rlon) float64 1MB ...
    lon                         (rlat, rlon) float64 1MB ...
  * time                        (time) datetime64[ns] 392B 2000-01-01 ... 200...
    height                      float64 8B ...
Dimensions without coordinates: vertices
Data variables:
    rotated_latitude_longitude  int32 4B ...
    vertices_lat                (rlat, rlon, vertices) float64 6MB ...
    vertices_lon                (rlat, rlon, vertices) float64 6MB ...
    tas                         (time, rlat, rlon) float32 34MB ...
Attributes: (12/36)
    Conventions:             CF-1.11
    activity_id:             DD
    contact:                 gerics-cordex@hereon.de
    creation_date:           2026-02-16T13:46:11Z
    domain:                  Europe
    domain_id:               EUR-12
    ...                      ...
    title:                   REMO2020-2-2 output prepared for CMIP6
    tracking_id:             hdl:21.14103/ff9a2bac-d199-4dee-8db6-ce7f87c9733a
    variable_id:             tas
    version_realization:     v1-r1
    license:                 https://cordex.org/data-access/cordex-cmip6-data...
    cmor_version:            3.14.0

xarray.Dataset

• Dimensions:
  • rlat: 412
  • rlon: 424
  • vertices: 4
  • time: 49
• Coordinates: (6)
  • rlat
    (rlat)
    float64
    -23.38 -23.27 ... 21.73 21.84

    units :

    degrees

    axis :

    Y

    long_name :

    latitude in rotated pole grid

    standard_name :

    grid_latitude

    array([-23.375, -23.265, -23.155, ...,  21.615,  21.725,  21.835], shape=(412,))

  • rlon
    (rlon)
    float64
    -28.38 -28.27 ... 18.05 18.16

    units :

    degrees

    axis :

    X

    long_name :

    longitude in rotated pole grid

    standard_name :

    grid_longitude

    array([-28.375, -28.265, -28.155, ...,  17.935,  18.045,  18.155], shape=(424,))

  • lat
    (rlat, rlon)
    float64
    ...

    standard_name :

    latitude

    long_name :

    latitude

    units :

    degrees_north

    bounds :

    vertices_lat

    [174688 values with dtype=float64]

  • lon
    (rlat, rlon)
    float64
    ...

    standard_name :

    longitude

    long_name :

    longitude

    units :

    degrees_east

    bounds :

    vertices_lon

    [174688 values with dtype=float64]

  • time
    (time)
    datetime64[ns]
    2000-01-01 ... 2000-01-03

    axis :

    T

    long_name :

    time

    standard_name :

    time

    array(['2000-01-01T00:00:00.000000000', '2000-01-01T01:00:00.000000000',
           '2000-01-01T02:00:00.000000000', '2000-01-01T03:00:00.000000000',
           '2000-01-01T04:00:00.000000000', '2000-01-01T05:00:00.000000000',
           '2000-01-01T06:00:00.000000000', '2000-01-01T07:00:00.000000000',
           '2000-01-01T08:00:00.000000000', '2000-01-01T09:00:00.000000000',
           '2000-01-01T10:00:00.000000000', '2000-01-01T11:00:00.000000000',
           '2000-01-01T12:00:00.000000000', '2000-01-01T13:00:00.000000000',
           '2000-01-01T14:00:00.000000000', '2000-01-01T15:00:00.000000000',
           '2000-01-01T16:00:00.000000000', '2000-01-01T17:00:00.000000000',
           '2000-01-01T18:00:00.000000000', '2000-01-01T19:00:00.000000000',
           '2000-01-01T20:00:00.000000000', '2000-01-01T21:00:00.000000000',
           '2000-01-01T22:00:00.000000000', '2000-01-01T23:00:00.000000000',
           '2000-01-02T00:00:00.000000000', '2000-01-02T01:00:00.000000000',
           '2000-01-02T02:00:00.000000000', '2000-01-02T03:00:00.000000000',
           '2000-01-02T04:00:00.000000000', '2000-01-02T05:00:00.000000000',
           '2000-01-02T06:00:00.000000000', '2000-01-02T07:00:00.000000000',
           '2000-01-02T08:00:00.000000000', '2000-01-02T09:00:00.000000000',
           '2000-01-02T10:00:00.000000000', '2000-01-02T11:00:00.000000000',
           '2000-01-02T12:00:00.000000000', '2000-01-02T13:00:00.000000000',
           '2000-01-02T14:00:00.000000000', '2000-01-02T15:00:00.000000000',
           '2000-01-02T16:00:00.000000000', '2000-01-02T17:00:00.000000000',
           '2000-01-02T18:00:00.000000000', '2000-01-02T19:00:00.000000000',
           '2000-01-02T20:00:00.000000000', '2000-01-02T21:00:00.000000000',
           '2000-01-02T22:00:00.000000000', '2000-01-02T23:00:00.000000000',
           '2000-01-03T00:00:00.000000000'], dtype='datetime64[ns]')

  • height
    ()
    float64
    ...

    units :

    m

    axis :

    Z

    positive :

    up

    long_name :

    height

    standard_name :

    height

    [1 values with dtype=float64]

• Data variables: (4)
  • rotated_latitude_longitude
    ()
    int32
    ...

    grid_mapping_name :

    rotated_latitude_longitude

    grid_north_pole_latitude :

    39.25

    grid_north_pole_longitude :

    -162.0

    north_pole_grid_longitude :

    0.0

    earth_radius :

    6371229.0

    [1 values with dtype=int32]

  • vertices_lat
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_north

    [698752 values with dtype=float64]

  • vertices_lon
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_east

    [698752 values with dtype=float64]

  • tas
    (time, rlat, rlon)
    float32
    ...

    standard_name :

    air_temperature

    long_name :

    Near-Surface Air Temperature

    comment :

    near-surface (usually, 2 meter) air temperature

    units :

    K

    cell_methods :

    area: mean time: point

    cell_measures :

    area: areacella

    history :

    2026-02-16T13:46:11Z altered by CMOR: Treated scalar dimension: 'height'.

    grid_mapping :

    rotated_latitude_longitude

    [8559712 values with dtype=float32]

• Attributes: (36)

  Conventions :

  CF-1.11

  activity_id :

  DD

  contact :

  gerics-cordex@hereon.de

  creation_date :

  2026-02-16T13:46:11Z

  domain :

  Europe

  domain_id :

  EUR-12

  driving_experiment :

  reanalysis simulation of the recent past

  driving_experiment_id :

  evaluation

  driving_institution_id :

  ECMWF

  driving_source :

  ECMWF Reanalysis v5

  driving_source_id :

  ERA5

  driving_variant_label :

  r1i1p1f1

  experiment_id :

  evaluation

  external_variables :

  areacella

  frequency :

  1hr

  grid :

  Rotated-pole latitude-longitude with 0.11 degree grid spacing

  history :

  2026-02-16T13:46:11Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table 1hr.

  institution :

  Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany

  institution_id :

  GERICS

  label :

  REMO2020 v2.2

  mip_era :

  CMIP6

  product :

  model-output

  project_id :

  CORDEX-CMIP6

  references :

  https://www.remo-rcm.de

  run_variant :

  1st realization

  source :

  Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)

  source_id :

  REMO2020-2-2

  source_type :

  ARCM

  table_id :

  1hr

  table_info :

  Creation Date:(16 February 2026) MD5:58090390e86a621615c661b6d1d4e5fd

  title :

  REMO2020-2-2 output prepared for CMIP6

  tracking_id :

  hdl:21.14103/ff9a2bac-d199-4dee-8db6-ce7f87c9733a

  variable_id :

  tas

  version_realization :

  v1-r1

  license :

  https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use

  cmor_version :

  3.14.0

!ncdump -h $f

netcdf tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_1hr_200001010000-200001030000 {
dimensions:
	time = UNLIMITED ; // (49 currently)
	rlat = 412 ;
	rlon = 424 ;
	bnds = 2 ;
	vertices = 4 ;
variables:
	double time(time) ;
		time:units = "days since 1950-01-01T00:00:00" ;
		time:calendar = "proleptic_gregorian" ;
		time:axis = "T" ;
		time:long_name = "time" ;
		time:standard_name = "time" ;
	double rlat(rlat) ;
		rlat:units = "degrees" ;
		rlat:axis = "Y" ;
		rlat:long_name = "latitude in rotated pole grid" ;
		rlat:standard_name = "grid_latitude" ;
	double rlon(rlon) ;
		rlon:units = "degrees" ;
		rlon:axis = "X" ;
		rlon:long_name = "longitude in rotated pole grid" ;
		rlon:standard_name = "grid_longitude" ;
	int rotated_latitude_longitude ;
		rotated_latitude_longitude:grid_mapping_name = "rotated_latitude_longitude" ;
		rotated_latitude_longitude:grid_north_pole_latitude = 39.25 ;
		rotated_latitude_longitude:grid_north_pole_longitude = -162. ;
		rotated_latitude_longitude:north_pole_grid_longitude = 0. ;
		rotated_latitude_longitude:earth_radius = 6371229. ;
	double lat(rlat, rlon) ;
		lat:standard_name = "latitude" ;
		lat:long_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:missing_value = 1.e+20 ;
		lat:_FillValue = 1.e+20 ;
		lat:bounds = "vertices_lat" ;
	double lon(rlat, rlon) ;
		lon:standard_name = "longitude" ;
		lon:long_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:missing_value = 1.e+20 ;
		lon:_FillValue = 1.e+20 ;
		lon:bounds = "vertices_lon" ;
	double vertices_lat(rlat, rlon, vertices) ;
		vertices_lat:units = "degrees_north" ;
		vertices_lat:missing_value = 1.e+20 ;
		vertices_lat:_FillValue = 1.e+20 ;
	double vertices_lon(rlat, rlon, vertices) ;
		vertices_lon:units = "degrees_east" ;
		vertices_lon:missing_value = 1.e+20 ;
		vertices_lon:_FillValue = 1.e+20 ;
	double height ;
		height:units = "m" ;
		height:axis = "Z" ;
		height:positive = "up" ;
		height:long_name = "height" ;
		height:standard_name = "height" ;
	float tas(time, rlat, rlon) ;
		tas:standard_name = "air_temperature" ;
		tas:long_name = "Near-Surface Air Temperature" ;
		tas:comment = "near-surface (usually, 2 meter) air temperature" ;
		tas:units = "K" ;
		tas:cell_methods = "area: mean time: point" ;
		tas:cell_measures = "area: areacella" ;
		tas:history = "2026-02-16T13:46:11Z altered by CMOR: Treated scalar dimension: \'height\'." ;
		tas:coordinates = "height lat lon" ;
		tas:missing_value = 1.e+20f ;
		tas:_FillValue = 1.e+20f ;
		tas:grid_mapping = "rotated_latitude_longitude" ;

// global attributes:
		:Conventions = "CF-1.11" ;
		:activity_id = "DD" ;
		:contact = "gerics-cordex@hereon.de" ;
		:creation_date = "2026-02-16T13:46:11Z" ;
		:domain = "Europe" ;
		:domain_id = "EUR-12" ;
		:driving_experiment = "reanalysis simulation of the recent past" ;
		:driving_experiment_id = "evaluation" ;
		:driving_institution_id = "ECMWF" ;
		:driving_source = "ECMWF Reanalysis v5" ;
		:driving_source_id = "ERA5" ;
		:driving_variant_label = "r1i1p1f1" ;
		:experiment_id = "evaluation" ;
		:external_variables = "areacella" ;
		:frequency = "1hr" ;
		:grid = "Rotated-pole latitude-longitude with 0.11 degree grid spacing" ;
		:history = "2026-02-16T13:46:11Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table 1hr." ;
		:institution = "Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany" ;
		:institution_id = "GERICS" ;
		:label = "REMO2020 v2.2" ;
		:mip_era = "CMIP6" ;
		:product = "model-output" ;
		:project_id = "CORDEX-CMIP6" ;
		:references = "https://www.remo-rcm.de" ;
		:run_variant = "1st realization" ;
		:source = "Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)" ;
		:source_id = "REMO2020-2-2" ;
		:source_type = "ARCM" ;
		:table_id = "1hr" ;
		:table_info = "Creation Date:(16 February 2026) MD5:58090390e86a621615c661b6d1d4e5fd" ;
		:title = "REMO2020-2-2 output prepared for CMIP6" ;
		:tracking_id = "hdl:21.14103/ff9a2bac-d199-4dee-8db6-ce7f87c9733a" ;
		:variable_id = "tas" ;
		:version_realization = "v1-r1" ;
		:license = "https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use" ;
		:cmor_version = "3.14.0" ;
}

!cfchecks $f

CHECKING NetCDF FILE: CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/1hr/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_1hr_200001010000-200001030000.nc
=====================

Using CF Checker Version 4.1.0
Checking against CF Version CF-1.8
Using Standard Name Table Version 92 (2025-07-24T14:20:46Z)
Using Area Type Table Version 13 (20 March 2025)
Using Standardized Region Name Table Version 5 (12 November 2024)

ERROR: (2.6.1): This netCDF file does not appear to contain CF Convention data.
WARN: (7.1): Boundary var vertices_lat should not have attribute units
WARN: (7.1): Boundary var vertices_lon should not have attribute units

------------------
Checking variable: time
------------------

------------------
Checking variable: rlat
------------------

------------------
Checking variable: rlon
------------------

------------------
Checking variable: rotated_latitude_longitude
------------------

------------------
Checking variable: lat
------------------

------------------
Checking variable: lon
------------------

------------------
Checking variable: vertices_lat
------------------
WARN: (7.1): Boundary Variable vertices_lat should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lat should not have missing_value attribute

------------------
Checking variable: vertices_lon
------------------
WARN: (7.1): Boundary Variable vertices_lon should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lon should not have missing_value attribute

------------------
Checking variable: height
------------------

------------------
Checking variable: tas
------------------
INFO: attribute history is being used in a non-standard way

ERRORS detected: 1
WARNINGS given: 6
INFORMATION messages: 1

!compliance-checker --test=cf:1.7 $f

Running Compliance Checker on the datasets from: ['CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/1hr/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_1hr_200001010000-200001030000.nc']

--------------------------------------------------------------------------------
                         IOOS Compliance Checker Report                         
                                 Version 5.4.2                                  
                     Report generated 2026-02-16T13:46:15Z                      
                                     cf:1.7                                     
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html
--------------------------------------------------------------------------------
                               Corrective Actions                               
tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_1hr_200001010000-200001030000.nc has 2 potential issues


                                    Warnings                                    
--------------------------------------------------------------------------------
§2.6 Attributes
* §2.6.1 Conventions global attribute does not contain "CF-1.7"

§7.1 Cell Boundaries
* The Boundary variables 'vertices_lat' should not have the attributes: '['units', 'missing_value', '_FillValue']'
* The Boundary variables 'vertices_lon' should not have the attributes: '['units', 'missing_value', '_FillValue']'
WARNING: The following exceptions occurred during the cf:1.7 checker (possibly indicate compliance checker issues):
cf:1.7.check_cell_boundaries_interval: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

# cordex.cmor will automatically resample hourly to other frequencies
# depending on the frequency in the cmor table and the frequency in the
# input dataset
f = test_cmorizer_subdaily("day")
f

/tmp/ipykernel_3707/3805428128.py:46: DeprecationWarning: 'CORDEX_domain' keyword is deprecated, please use the 'domain_id' keyword instead
  filename = cmor.cmorize_variable(
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:517: UserWarning: resampling input data from H to D
  warn(f"resampling input data from {input_freq} to {pd_freq}")
<string>:7: RuntimeWarning: The 'offset' keyword does not take effect when resampling with a 'freq' that is not Tick-like (h, m, s, ms, us)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:635: UserWarning: adding time bounds
  warn("adding time bounds")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/cmor.py:426: UserWarning: time units are set to default: days since 1950-01-01T00:00:00
  warn(f"time units are set to default: {u}")
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/cmor/utils.py:334: UserWarning: writing temporary table to /tmp/tmprb_hnsjb
  warn(f"writing temporary table to {filename}")

/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:321: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  x_bnds = bnds.cf.get_bounds("X").drop(bnds.cf.bounds["X"])
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cordex/transform.py:322: FutureWarning: dropping variables using `drop` is deprecated; use drop_vars.
  y_bnds = bnds.cf.get_bounds("Y").drop(bnds.cf.bounds["Y"])
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1000: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  unused_keys = set(attribute.keys()) - set(inverted)
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1001: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  for key, value in attribute.items():
<frozen _collections_abc>:894: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
/home/runner/micromamba/envs/cordex-examples/lib/python3.12/site-packages/cf_xarray/accessor.py:1009: FutureWarning: The return type of `Dataset.dims` will be changed to return a set of dimension names in future, in order to be more consistent with `DataArray.dims`. To access a mapping from dimension names to lengths, please use `Dataset.sizes`.
  newmap.update({key: attribute[key] for key in unused_keys})

'CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/day/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_day_20000101-20000103.nc'

ds = xr.open_dataset(f)
ds

<xarray.Dataset> Size: 16MB
Dimensions:                     (time: 3, bnds: 2, rlat: 412, rlon: 424,
                                 vertices: 4)
Coordinates:
  * time                        (time) datetime64[ns] 24B 2000-01-01 ... 2000...
  * rlat                        (rlat) float64 3kB -23.38 -23.27 ... 21.73 21.84
  * rlon                        (rlon) float64 3kB -28.38 -28.27 ... 18.05 18.16
    lat                         (rlat, rlon) float64 1MB ...
    lon                         (rlat, rlon) float64 1MB ...
    height                      float64 8B ...
Dimensions without coordinates: bnds, vertices
Data variables:
    time_bnds                   (time, bnds) datetime64[ns] 48B ...
    rotated_latitude_longitude  int32 4B ...
    vertices_lat                (rlat, rlon, vertices) float64 6MB ...
    vertices_lon                (rlat, rlon, vertices) float64 6MB ...
    tas                         (time, rlat, rlon) float32 2MB ...
Attributes: (12/36)
    Conventions:             CF-1.11
    activity_id:             DD
    contact:                 gerics-cordex@hereon.de
    creation_date:           2026-02-16T13:46:15Z
    domain:                  Europe
    domain_id:               EUR-12
    ...                      ...
    title:                   REMO2020-2-2 output prepared for CMIP6
    tracking_id:             hdl:21.14103/fb7d821c-b32d-4b63-ae7f-5a6ec2cf0523
    variable_id:             tas
    version_realization:     v1-r1
    license:                 https://cordex.org/data-access/cordex-cmip6-data...
    cmor_version:            3.14.0

xarray.Dataset

• Dimensions:
  • time: 3
  • bnds: 2
  • rlat: 412
  • rlon: 424
  • vertices: 4
• Coordinates: (6)
  • time
    (time)
    datetime64[ns]
    2000-01-01 2000-01-02 2000-01-03

    bounds :

    time_bnds

    axis :

    T

    long_name :

    time

    standard_name :

    time

    array(['2000-01-01T00:00:00.000000000', '2000-01-02T00:00:00.000000000',
           '2000-01-03T00:00:00.000000000'], dtype='datetime64[ns]')

  • rlat
    (rlat)
    float64
    -23.38 -23.27 ... 21.73 21.84

    units :

    degrees

    axis :

    Y

    long_name :

    latitude in rotated pole grid

    standard_name :

    grid_latitude

    array([-23.375, -23.265, -23.155, ...,  21.615,  21.725,  21.835], shape=(412,))

  • rlon
    (rlon)
    float64
    -28.38 -28.27 ... 18.05 18.16

    units :

    degrees

    axis :

    X

    long_name :

    longitude in rotated pole grid

    standard_name :

    grid_longitude

    array([-28.375, -28.265, -28.155, ...,  17.935,  18.045,  18.155], shape=(424,))

  • lat
    (rlat, rlon)
    float64
    ...

    standard_name :

    latitude

    long_name :

    latitude

    units :

    degrees_north

    bounds :

    vertices_lat

    [174688 values with dtype=float64]

  • lon
    (rlat, rlon)
    float64
    ...

    standard_name :

    longitude

    long_name :

    longitude

    units :

    degrees_east

    bounds :

    vertices_lon

    [174688 values with dtype=float64]

  • height
    ()
    float64
    ...

    units :

    m

    axis :

    Z

    positive :

    up

    long_name :

    height

    standard_name :

    height

    [1 values with dtype=float64]

• Data variables: (5)
  • time_bnds
    (time, bnds)
    datetime64[ns]
    ...

    [6 values with dtype=datetime64[ns]]

  • rotated_latitude_longitude
    ()
    int32
    ...

    grid_mapping_name :

    rotated_latitude_longitude

    grid_north_pole_latitude :

    39.25

    grid_north_pole_longitude :

    -162.0

    north_pole_grid_longitude :

    0.0

    earth_radius :

    6371229.0

    [1 values with dtype=int32]

  • vertices_lat
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_north

    [698752 values with dtype=float64]

  • vertices_lon
    (rlat, rlon, vertices)
    float64
    ...

    units :

    degrees_east

    [698752 values with dtype=float64]

  • tas
    (time, rlat, rlon)
    float32
    ...

    standard_name :

    air_temperature

    long_name :

    Near-Surface Air Temperature

    comment :

    near-surface (usually, 2 meter) air temperature

    units :

    K

    cell_methods :

    area: time: mean

    cell_measures :

    area: areacella

    history :

    2026-02-16T13:46:15Z altered by CMOR: Treated scalar dimension: 'height'.

    grid_mapping :

    rotated_latitude_longitude

    [524064 values with dtype=float32]

• Attributes: (36)

  Conventions :

  CF-1.11

  activity_id :

  DD

  contact :

  gerics-cordex@hereon.de

  creation_date :

  2026-02-16T13:46:15Z

  domain :

  Europe

  domain_id :

  EUR-12

  driving_experiment :

  reanalysis simulation of the recent past

  driving_experiment_id :

  evaluation

  driving_institution_id :

  ECMWF

  driving_source :

  ECMWF Reanalysis v5

  driving_source_id :

  ERA5

  driving_variant_label :

  r1i1p1f1

  experiment_id :

  evaluation

  external_variables :

  areacella

  frequency :

  day

  grid :

  Rotated-pole latitude-longitude with 0.11 degree grid spacing

  history :

  2026-02-16T13:46:15Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table day.

  institution :

  Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany

  institution_id :

  GERICS

  label :

  REMO2020 v2.2

  mip_era :

  CMIP6

  product :

  model-output

  project_id :

  CORDEX-CMIP6

  references :

  https://www.remo-rcm.de

  run_variant :

  1st realization

  source :

  Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)

  source_id :

  REMO2020-2-2

  source_type :

  ARCM

  table_id :

  day

  table_info :

  Creation Date:(16 February 2026) MD5:db0ce8ec5862b6ef035969f6da454305

  title :

  REMO2020-2-2 output prepared for CMIP6

  tracking_id :

  hdl:21.14103/fb7d821c-b32d-4b63-ae7f-5a6ec2cf0523

  variable_id :

  tas

  version_realization :

  v1-r1

  license :

  https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use

  cmor_version :

  3.14.0

ds.tas.plot(col="time")

<xarray.plot.facetgrid.FacetGrid at 0x7fa2d135c920>

!ncdump -h $f

netcdf tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_day_20000101-20000103 {
dimensions:
	time = UNLIMITED ; // (3 currently)
	rlat = 412 ;
	rlon = 424 ;
	bnds = 2 ;
	vertices = 4 ;
variables:
	double time(time) ;
		time:bounds = "time_bnds" ;
		time:units = "days since 1950-01-01T00:00:00" ;
		time:calendar = "proleptic_gregorian" ;
		time:axis = "T" ;
		time:long_name = "time" ;
		time:standard_name = "time" ;
	double time_bnds(time, bnds) ;
	double rlat(rlat) ;
		rlat:units = "degrees" ;
		rlat:axis = "Y" ;
		rlat:long_name = "latitude in rotated pole grid" ;
		rlat:standard_name = "grid_latitude" ;
	double rlon(rlon) ;
		rlon:units = "degrees" ;
		rlon:axis = "X" ;
		rlon:long_name = "longitude in rotated pole grid" ;
		rlon:standard_name = "grid_longitude" ;
	int rotated_latitude_longitude ;
		rotated_latitude_longitude:grid_mapping_name = "rotated_latitude_longitude" ;
		rotated_latitude_longitude:grid_north_pole_latitude = 39.25 ;
		rotated_latitude_longitude:grid_north_pole_longitude = -162. ;
		rotated_latitude_longitude:north_pole_grid_longitude = 0. ;
		rotated_latitude_longitude:earth_radius = 6371229. ;
	double lat(rlat, rlon) ;
		lat:standard_name = "latitude" ;
		lat:long_name = "latitude" ;
		lat:units = "degrees_north" ;
		lat:missing_value = 1.e+20 ;
		lat:_FillValue = 1.e+20 ;
		lat:bounds = "vertices_lat" ;
	double lon(rlat, rlon) ;
		lon:standard_name = "longitude" ;
		lon:long_name = "longitude" ;
		lon:units = "degrees_east" ;
		lon:missing_value = 1.e+20 ;
		lon:_FillValue = 1.e+20 ;
		lon:bounds = "vertices_lon" ;
	double vertices_lat(rlat, rlon, vertices) ;
		vertices_lat:units = "degrees_north" ;
		vertices_lat:missing_value = 1.e+20 ;
		vertices_lat:_FillValue = 1.e+20 ;
	double vertices_lon(rlat, rlon, vertices) ;
		vertices_lon:units = "degrees_east" ;
		vertices_lon:missing_value = 1.e+20 ;
		vertices_lon:_FillValue = 1.e+20 ;
	double height ;
		height:units = "m" ;
		height:axis = "Z" ;
		height:positive = "up" ;
		height:long_name = "height" ;
		height:standard_name = "height" ;
	float tas(time, rlat, rlon) ;
		tas:standard_name = "air_temperature" ;
		tas:long_name = "Near-Surface Air Temperature" ;
		tas:comment = "near-surface (usually, 2 meter) air temperature" ;
		tas:units = "K" ;
		tas:cell_methods = "area: time: mean" ;
		tas:cell_measures = "area: areacella" ;
		tas:history = "2026-02-16T13:46:15Z altered by CMOR: Treated scalar dimension: \'height\'." ;
		tas:coordinates = "height lat lon" ;
		tas:missing_value = 1.e+20f ;
		tas:_FillValue = 1.e+20f ;
		tas:grid_mapping = "rotated_latitude_longitude" ;

// global attributes:
		:Conventions = "CF-1.11" ;
		:activity_id = "DD" ;
		:contact = "gerics-cordex@hereon.de" ;
		:creation_date = "2026-02-16T13:46:15Z" ;
		:domain = "Europe" ;
		:domain_id = "EUR-12" ;
		:driving_experiment = "reanalysis simulation of the recent past" ;
		:driving_experiment_id = "evaluation" ;
		:driving_institution_id = "ECMWF" ;
		:driving_source = "ECMWF Reanalysis v5" ;
		:driving_source_id = "ERA5" ;
		:driving_variant_label = "r1i1p1f1" ;
		:experiment_id = "evaluation" ;
		:external_variables = "areacella" ;
		:frequency = "day" ;
		:grid = "Rotated-pole latitude-longitude with 0.11 degree grid spacing" ;
		:history = "2026-02-16T13:46:15Z ;rewrote data to be consistent with CORDEX-CMIP6 for variable tas found in table day." ;
		:institution = "Climate Service Center Germany, Helmholtz Centre hereon GmbH, Hamburg, Germany" ;
		:institution_id = "GERICS" ;
		:label = "REMO2020 v2.2" ;
		:mip_era = "CMIP6" ;
		:product = "model-output" ;
		:project_id = "CORDEX-CMIP6" ;
		:references = "https://www.remo-rcm.de" ;
		:run_variant = "1st realization" ;
		:source = "Regional Climate Model REMO, version 2.2, hydrostatic configuration with MACv2 aerosol forcing and Fresh-water Lake model (FLake) (2023)" ;
		:source_id = "REMO2020-2-2" ;
		:source_type = "ARCM" ;
		:table_id = "day" ;
		:table_info = "Creation Date:(16 February 2026) MD5:db0ce8ec5862b6ef035969f6da454305" ;
		:title = "REMO2020-2-2 output prepared for CMIP6" ;
		:tracking_id = "hdl:21.14103/fb7d821c-b32d-4b63-ae7f-5a6ec2cf0523" ;
		:variable_id = "tas" ;
		:version_realization = "v1-r1" ;
		:license = "https://cordex.org/data-access/cordex-cmip6-data/cordex-cmip6-terms-of-use" ;
		:cmor_version = "3.14.0" ;
}

!cfchecks $f

CHECKING NetCDF FILE: CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/day/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_day_20000101-20000103.nc
=====================

Using CF Checker Version 4.1.0
Checking against CF Version CF-1.8
Using Standard Name Table Version 92 (2025-07-24T14:20:46Z)
Using Area Type Table Version 13 (20 March 2025)
Using Standardized Region Name Table Version 5 (12 November 2024)

ERROR: (2.6.1): This netCDF file does not appear to contain CF Convention data.
WARN: (7.1): Boundary var vertices_lat should not have attribute units
WARN: (7.1): Boundary var vertices_lon should not have attribute units

------------------
Checking variable: time
------------------

------------------
Checking variable: time_bnds
------------------

------------------
Checking variable: rlat
------------------

------------------
Checking variable: rlon
------------------

------------------
Checking variable: rotated_latitude_longitude
------------------

------------------
Checking variable: lat
------------------

------------------
Checking variable: lon
------------------

------------------
Checking variable: vertices_lat
------------------
WARN: (7.1): Boundary Variable vertices_lat should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lat should not have missing_value attribute

------------------
Checking variable: vertices_lon
------------------
WARN: (7.1): Boundary Variable vertices_lon should not have _FillValue attribute
WARN: (7.1): Boundary Variable vertices_lon should not have missing_value attribute

------------------
Checking variable: height
------------------

------------------
Checking variable: tas
------------------
INFO: attribute history is being used in a non-standard way

ERRORS detected: 1
WARNINGS given: 6
INFORMATION messages: 1

!compliance-checker --test=cf:1.7 $f

Running Compliance Checker on the datasets from: ['CORDEX/CORDEX-CMIP6/DD/EUR-12/GERICS/ERA5/evaluation/r1i1p1f1/REMO2020-2-2/v1-r1/day/tas/v20260216/tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_day_20000101-20000103.nc']

--------------------------------------------------------------------------------
                         IOOS Compliance Checker Report                         
                                 Version 5.4.2                                  
                     Report generated 2026-02-16T13:46:19Z                      
                                     cf:1.7                                     
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html
--------------------------------------------------------------------------------
                               Corrective Actions                               
tas_EUR-12_ERA5_evaluation_r1i1p1f1_GERICS_REMO2020-2-2_v1-r1_day_20000101-20000103.nc has 2 potential issues


                                    Warnings                                    
--------------------------------------------------------------------------------
§2.6 Attributes
* §2.6.1 Conventions global attribute does not contain "CF-1.7"

§7.1 Cell Boundaries
* The Boundary variables 'vertices_lat' should not have the attributes: '['units', 'missing_value', '_FillValue']'
* The Boundary variables 'vertices_lon' should not have the attributes: '['units', 'missing_value', '_FillValue']'