Reanalyses combine model fields with observations distributed irregularly in space and time into a spatially complete gridded meteorological data set, with an unchanging model and analysis system spanning the historical data record. They have proven to be extremely valuable scientific tools, enabling climate and weather research not otherwise possible. The GMAO has undertaken a reanalysis for the satellite era —MERRA— using the GEOS-5 AGCM and its atmospheric data assimilation system from 1979 to the present. MERRA is continuing as a real-time climate analysis. The GMAO continues efforts to improve on atmospheric reanalyses at the same time as working a Integrated Earth System Analysis (IESA) with our atmosphere, ocean and land surface data assimilation systems. The atmospheric assimilation system includes an aerosol data assimilation and an emerging assimilation of carbon species.

» MERRA: Modern-Era Retrospective Analysis for Research and Applications

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