The ERA-15 production system generated re-analyses for 15 years (1979-1993) using a special version of their 1995 operational data assimilation system and model. The resulting analyses include full model resolution analyses or reduced resolution analyses and climate and statistics data. ERA-15 is the precursor to ERA-40 and ERA-Interim. It is recommended that the ERA-Interim products be used rather the ERA-15 or ERA-40.
Shea, Dennis & National Center for Atmospheric Research Staff (Eds). Last modified 02 Mar 2016. "The Climate Data Guide: ERA-15." Retrieved from https://climatedataguide.ucar.edu/climate-data/era-15.