CVs and MIP Tables

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Controlled vocabularies (CVs) play a key role in ensuring uniformity in the description of data sets across all models. A controlled vocabulary is an agreed list of terms definitions used to provide a unique label to a concept. CMIP6 controlled vocabularies cover many different aspects: experiments, variables, realms, models, sub-projects, frequency, resolution and grid labels. These definition and labels for variables, frequency and realms are often adopted by other climate data producers.

What is the difference between MIP tables and CVs?

  • MIP Tables  – a master registry containing  information on the variables, institutions (modelling groups, dataset providers and consortiums), (time) frequencies , model calendars, source type, model realms (cryosphere, ocean, atmosphere, etc.), regions and licences 
  • Project CVs  –  a subset of project specific information including activity_id, experiment_id, source_id, DRS, licences, required global attributes.  
  • User content  – a further subset used at runtime to define a model. 

Where can these be found:

How to engage:


This is where minor changes, bugs and fixes are proposed, highlighted, discussed and fixed. Everyone is encouraged to give suggestions  and assist in relevant work if it is suitable to do so. 

·        The MIP Tables can be located at

·        The CMIP6Plus CVs are located at

Discussion Boards: 

Larger issues, workflows and operational changes for discussion with the community will be reviewed here. This is also the place for feedback not related to a specific technical component in the repository. 

·        Discussion board for CVs:

·        Discussion board for MIP tables:

CMIP feedback webpage

Previously answered Q&As can be read below.

Any other feedback can also be submitted through the question submission form on our Q&A and feedback webpage.

IPO email

All other responses, queries, or questions can also be sent to the CMIP IPO email address, found in the website bottom banner.

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