The Science Keywords reflect the GCMD's last Science Keyword release. At this time, we are requesting that the following citation be used by those individuals and groups using the GCMD Keywords.
Global Change Master Directory (GCMD). 2016. GCMD Keywords, Version 8.4. Greenbelt, MD: Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA). URL: