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MERRA Data Access

The Modern Era Retrospective-analysis for Research and Applications (MERRA) production is underway and multi-year segments of the meteorological analyses from each of the 3 production streams are now available online at the GES DISC.

MERRA uses Version 5.2.0 of the GEOS-5 DAS with the model and analysis each at 1/2x2/3 degrees resolution. More information, including an emerging FAQ and the MERRA File Specification document detailing the product suite, is available at our MERRA web site http://gmao.gsfc.nasa.gov/merra.

The MERRA production is being conducted in 3 separate streams, 1979 - 1989; 1989 - 1998; 1998 - present. Data are being uploaded to the MDISC after undergoing quality assurance in the GMAO. Production is expected to continue through mid-to-late 2009, with stream 3 continuing in near-real-time climate mode.

The GMAO welcomes any feedback on MERRA products. We also request that you register at the MDISC if you download MERRA products so that we can keep you informed of any issues that are encountered.

If you use MERRA data in publications, please acknowledge the Global Modeling and Assimilation Office (GMAO) and the GES DISC for the dissemination of MERRA. Also, we would appreciate receiving a preprint and/or reprint of publications utilizing the data for inclusion in the GMAO/MERRA bibliography. Relevant publications should be sent to:

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