CMOR 3.15.2 released!!!

Wed, 24 Jun 2026 00:00:00 -0700

Features

Added CMIP7 Fortran examples for regular grids, pressure levels, scalar height coordinates, basin axes, hybrid sigma levels, curvilinear grids, and fixed fields. (#977)
- The Fortran examples include a shared helper module, a run script, and nightly-build coverage.
Added CMIP7 Python examples matching the new Fortran example coverage. (#978)
Added example CMIP7 cmorizing notebooks using real model-data excerpts, including regular lat-lon data, pressure levels, hybrid sigma coordinates, basin axes, land-use fractions, and non-lat-lon sea-ice data. (#976)

Bugfixes

CMOR now checks CV JSON strings and keys against the 1023-character limit before copying them into fixed-size strings, preventing crashes and reporting the offending value in the error message. (#985)
The Fortran cmor_dataset_json wrapper now returns a reliable status code. (#977)

Changes

Concatenated variable comment attributes now identify the source table by file name instead of using activity_id. (#984)
- Example output now uses text like CMIP6_Amon.json comment: ....
Error and warning color formatting is now only emitted for terminal output, avoiding ANSI color characters in log files. (#985)

Issues / Pull Requests

GitHub

CMOR 3.15.1 released!!!

Wed, 20 May 2026 00:00:00 -0700

Bugfixes

The table_info global attribute will now contain the table’s file name. (#970)
- Example: table_info = "Name: CMIP7_atmos.json; Creation Date: ....
The default history global attribute text was updated to remove the redundant “CF standards” wording. (#969)
- CMOR now writes history entries in the form CMOR rewrote data to be consistent with <Conventions> and <mip_era> data requirements.
Time-interval validation now runs for time1 axes even when bounds are not supplied in cmor_axis. (#972)

Changes

Climatology time axes are excluded from interval checking in cmor_write. (#972)

CI / Tests

CMIP7 Python tests now use the latest CV file from cmip7-cmor-tables instead of the stale test CV. (#973)
- Removed outdated CMIP7 JSON files from TestTables/.
- Test cleanup now removes temporary input and CV files created during runs.

Issues / Pull Requests

GitHub

CMOR 3.15.0 released!!!

Mon, 11 May 2026 00:00:00 -0700

Features

Added official Python wheel builds for CMOR releases, including Linux wheels, full Python test coverage in the wheel pipeline, and release assets attached on GitHub. (#932)
CMIP7 controlled vocabularies can now define drs_specs and tracking_prefix as root-level strings. (#961)
- A root-level drs_specs string is now written to the output file as a global attribute.
- A root-level tracking_prefix string is now used when generating tracking_id.

Bugfixes

User-provided Conventions values in the dataset JSON are now preserved and written to the output file instead of always being replaced by the table default. (#960)
The default table-header product value is now model-output instead of model_output, aligning generated metadata with current DRS terminology. (#960)

CI / Tests

Fixed test-cleanup failures in make test_python and make test_cmip6_cv that could raise OSError: [Errno 39] Directory not empty during teardown. (#955)
- CMOR now removes the generated NetCDF files without trying to remove shared output directories that may still contain files from other tests.

Changes

Nightly Linux builds that were previously run on CircleCI now run on GitHub Actions. (#958)
Nightly package versions are now kept in sync. (#959)

Issues / Pull Requests

GitHub

CMOR 3.14.3 released!!!

Tue, 28 Apr 2026 00:00:00 -0700

Bugfixes

Fixed file names for CMIP7 climatology datasets. (#950)
- CMIP7 climatology outputs now use the expected monthly time-range format in file names.
- Added regression coverage in Test/test_cmor_CMIP7.py for the output filename, frequency attribute, and climatology metadata.

Changes

Removed unused filename-validation and suffix-tracking code from the C core, simplifying internal output-name handling. (#949)

Documentation

Added QUICKSTART.md to the main CMOR repository with concise instructions for cloning, building, installing, and testing CMOR in a Conda/Mamba environment. (#951)
Updated the user-input documentation in this repository to clarify how version affects output paths and global attributes. (#192)
- The guide now explains that setting version adds a netCDF global attribute.
- It also shows how to use an internal attribute such as _dir_version with <dir_version> in output_path_template when only the directory name should change.

Issues / Pull Requests

GitHub

CMOR 3.14.2 released!!!

Thu, 16 Apr 2026 00:00:00 -0700

Changes

Refreshed CMIP7-oriented user guidance in cmor_CV.c for invalid source_id and institution_id values, including current WCRP-CMIP issue links and the CMIP7 CV registration guide. (#942)
- Updated source_id and institution_id CV error messages to point users to current CMIP7 registration issue templates and guidance instead of outdated links.
CMIP7 datasets now write parent and branch attributes only when the selected experiment defines parent experiments in the controlled vocabulary. (#940)
- This is done when _cmip7_option is enabled in the user input JSON.
- When a CMIP7 experiment has no parent experiments, CMOR now warns about stray parent attributes and removes them before writing the output file.
- When a CMIP7 experiment requires a parent, CMOR now errors if parent_experiment_id is missing, not allowed by the controlled vocabulary, or paired with an invalid parent_activity_id.

CI / Tests

Added Test/test_cmor_parent_attrs.py coverage for CMIP7 parent-attribute handling across no-parent experiments, required-parent experiments, warning-and-removal behavior, and invalid parent metadata. (#940)
- Updated existing CMIP7 Python tests to reflect the new parent-attribute rules and to clean up temporary test inputs created during test runs.

Issues / Pull Requests

GitHub

CMOR 3.14.1 released!!!

Wed, 18 Mar 2026 00:00:00 -0700

Bugfixes

Improved error messages for time interval validation to provide clearer guidance to users. (#915)
- When a dataset has a defined frequency attribute, the error message will include both the frequency name and its corresponding approximate time interval.
Added a clearer error message when Zstandard compression is requested but the ZSTD filter is unavailable. (#925)
- This error instructs users to install hdf5plugin and set the HDF5_PLUGIN_PATH environment variable.

Changes

CMIP7 datasets: ignore the branch_method global attribute and do not add table_id to output files. (#926)

CI / Tests

CI build migrated from conda-build to rattler-build, improving build performance. (#922)
CI test environment now installs hdf5plugin and configures HDF5_PLUGIN_PATH for the NetCDF ZSTD filter. (#922)
Updated CMIP7 test file templates. (#921)
Updated CMIP7 dataset unit tests to match latest required/optional global attributes. (#926)
- Now requires license_id, adds drs_specs, no longer requires experiment, and removes grid and source_type.

Closed Issues

GitHub

CMOR 3.14.0 released!!!

Thu, 29 Jan 2026 00:00:00 -0800

Features

New chunking strategy to support CMIP7 repacking requirements.
- Chunking dimensions of the time and time bounds axes will be set to the length of the time axis, plus a dimension of size 2 for the bounds, if it is known when the time axis is created. Otherwise, the time and time bounds chunking dimensions will be set to 512 by default.
- Chunking dimensions for data variables will be determined by whether chunks can be at least 4 MB in size.
  - If multiple time slices of data can fit within 4 MB, then chunking dimensions will have multiple time slices and full spatial dimensions of the data variable.
  - If a single time slice is greater than 4 MB, then chunking dimensions will have one time slice with spatial chunking dimensions determined by the NetCDF library.
The function cmor_set_chunking has been added to the API, allowing users to define NetCDF variable chunking dimensions.
- Setting the chunking dimensions with cmor_set_chunking will override the automatic chunking strategy for CMIP7 repacking.

Bugfixes

Fixed bug where using cmor.write with the store_with parameter will throw an error when time values are not passed.

Changes

Removed legacy Python 2 code from Python interface and unit tests.
cmor_setup in the Fortran API will now allow the use of NetCDF4 functionality when setting the parameter netcdf_file_action with either “preserve_4”, “append_4”, or “replace_4”.

Closed Issues

GitHub

CMOR 3.13.2 released!!!

Thu, 08 Jan 2026 00:00:00 -0800

Changes

The function cmor_set_variable_attribute will now allow the variable attribute long_name to be modified.

Closed Issues

Allow users of CMOR to override long_name from tables (#891)

GitHub

CMOR 3.13.1 released!!!

Wed, 17 Dec 2025 00:00:00 -0800

Changes

The CMIP7 CMOR tables repo will now be a submodule of the CMOR repo. CMIP7 unit tests for CMOR have been modified to use these tables.
The attribute branded_variable will be added to a dataset’s global attributes if the variable table entry name has a branding_suffix.

Closed Issues

GitHub

CMOR 3.13.0 released!!!

Tue, 14 Oct 2025 00:00:00 -0700

Features

The global attributes realization_index, initialization_index, physics_index and forcing_index can now have string values when either _use_strings_for_indexes or _cmip7_option are present in the user input parameters.

Bugfixes

Resolved an issue where running multiple unit tests within a unittest class that used variable tables with branding suffixes would corrupt the branding suffixes, labels, and out names in subsequent tests within the unittest class.

Changes

Added support for Python 3.14.
PrePARE has been removed from CMOR.
CMIP7 tests have been updated to confirm that secondary realms can be applied to variables by having multiple realms listed for modeling_realm in variable entries. See test here.

Closed Issues

GitHub