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To submit a keyword, the submitter should:

Review the controlled keyword requirements/guidelines
Verify that the keyword does NOT already exist
Include a definition of the proposed keyword

Once the above is complete, submit the request to support@earthdata.nasa.gov

The keywords can be accessed via:

GCMD Keyword Directory: http://gcmdservices.gsfc.nasa.gov/static/kms/
Dynamic RESTful Service http://gcmdservices.gsfc.nasa.gov/kms/capabilities

The keywords should be cited as:

Global Change Master Directory (GCMD). 2015. GCMD Keywords, Version 8.1. Greenbelt, MD: Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA). URL:http://gcmd.nasa.gov/learn/keywords.html