PCMDI Published Content

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Published January 30, 2026 | Version 3.14.0
Software Open

The Climate Model Output Rewriter (CMOR)

Authors/Creators

  • 1. Program for Climate Model Diagnosis and Intercomparison (PCMDI)
  • 2. Program for Climate Model Diagnosis and Intercomparison (PCMDI, formerly)
  • 3. Universidad de Cantabria (UniCan)
  • 4. Met Office Hadley Centre (MetOffice)
  • 5. Spanish State Meteorological Agency
  • 6. Climate Resource
  • 7. Japan Agency for Marine Earth Science and Technology (JAMSTEC)
  • 8. German Climate Computing Centre (DKRZ)

Description

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

Notes

If you use the CMOR software, please cite it using the metadata from this file

Files

PCMDI/cmor-3.14.0.zip

Files (3.5 MB)

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md5:e9c59e2abb8e4be38ff12e08903d5dbb
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Additional details

Related works

Is supplement to
Software: https://github.com/PCMDI/cmor/tree/3.14.0 (URL)

Software

Repository URL
https://github.com/PCMDI/cmor