The Global Temperature and Salinity Profile Programme (GTSPP) is an international cooperative developed by a group of marine and oceanic science organizations to provide researchers and marine operations managers with accurate, up-to-date temperature and salinity data. The World Meteorological Organization (WMO) and the Intergovernmental Oceanographic Commission (IOC) jointly manage the program’s network of capture, archive, and dissemination systems to ensure sustained quality control, storage, and access. NCEI maintains the program’s long-term archive by providing storage and quality control services to ensure that best copy versions of GTSPP data are properly preserved and available to the public.