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.
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Accessing MERRA

MERRA data are available at the Modeling and AssimilationData and Information Services Center (MDISC), managed by the NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC).

Sign Up for the MERRA Mailing List

Sign up for the MERRA email list to receive announcements on the latest data information, tools and services that become available, data announcements from GMAO and more! Contact the GES DISC User Services to be added to the list.

MERRA Contacts

Should you still have questions regarding MERRA data or accessibility after reading through the information here and at the MDISC site, please send email to:

News and Status

• ICR4 Conference Report Available •

The Report of the 4th International Conference on Reanalyses is available from the World Climate Research Programme at

• Two new products added to GMAO's extensive suite of MERRA data •

A new ocean surface diagnostics product and a new land surface diagnostics product have been added to the suite of MERRA data available through the GES DISC. Read more about these new data products.

• MERRA File Specification now available •

The MERRA File Specification, version 2.3, and the latest GEOS5 Glossary are now available on the MERRA File Specification Documentation page.

• J. Climate MERRA Special Collection •

Many papers have now been published in the MERRA Special Collection in the AMS Journal of Climate. Others still under review are available on the MERRA publications page.

• MERRA Atlas now available •

The initial version of the interactive MERRA Atlas is now available online. Please note that the Atlas is still evolving. User comments are invited.

» Go to the MERRA Atlas

• MERRA in High Latitudes •thumbnail of graphic from paper

Two papers in Journal of Climate special issue evaluate the climate of high latitudes in MERRA including poleward energy transport.

» Read more


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