Modern Era Retrospective-analysis for Research and Applications

Project Description
MERRA is a NASA reanalysis for the satellite era using a major new version of the Goddard Earth Observing System Data Assimilation System Version 5 (GEOS-5). The Project focuses on historical analyses of the hydrological cycle on a broad range of weather and climate time scales and places the NASA EOS suite of observations in a climate context.

More Information:
http://gmao.gsfc.nasa.gov/research/merra/

[Source: MERRA Project Home Page]