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Modeling and Assimilation: OVERVIEW

Welcome to the Modeling and Assimilation Data and Information Services Center (MDISC).

Atmospheric, land and ocean observations from satellites, aircrafts, ships, and other sources are grouped, modeled or assimilated into various time scales varying from hourly to multi decadal and processed for visualization and analysis for user community. Assimilated data products are available from the GES DISC.

The Goddard Earth Observing System (GEOS) Data Assimilation System (DAS) is used to generate meteorological data assimilation products in support of NASA instrument teams, NASA's research programs, field campaigns, and as a contribution to U.S. weather and climate research. In addition to near-real-time products, the Global Modeling and Assimilation Office (GMAO) is using version 5 of the GEOS DAS (GEOS-5 DAS) for a retrospective atmospheric analysis for the satellite period (1979 - present). The Second Modern Era Retrospective-analysis for Research and Applications (MERRA-2) is available online through the MDISC.

Data Availability and Latency:

MERRA-2 data has a latency of about 2-3 weeks after the completion of a month. So for example to obtain any data from June, it will not be available in the archive until about the 2nd to 3rd week of July.

Sign Up for the MERRA-2 Mailing List

Sign up for the MERRA-2 listserv 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-2 Science Data and Data Processing Questions

Do you have a question about MERRA/MERRA-2? Take a look at the File Specification Document and if that doesn't answer your question, users can contact staff with questions on the data, data processing and science. Send questions to


More data will become available from the GES DISC in the future.


Latest News

Image of MERRA-2 Monthly Total Aerosol Scattering (AOT) at 550 nm for the month of April, averaged over the period 1980-2014.
Feb 01, 2016 - MERRA-2 data set from GMAO now available at the GES DISC

New version of the Modern Era Retrospective-analysis for Research and Analysis (MERRA) data set

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A new feature in this release of Giovanni is a linear regression line for time-series data.  Shown here is the Fraction of sea-ice in the Beaufort Sea, 1979-2015.
Dec 09, 2015 - Giovanni Version 4.17 Release Summary

Release includes new data variables, better mapping, time-series trend line

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The highlighted area of the Sierra Nevada Mountains was used to generate a time-series of snow mass, vital to the water interests in California.
May 30, 2014 - The May 2014 issue of The Giovanni News is online

Lightning and NO2 in Africa, rain and floods in Florida, drought and snow in California

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In 2013, the GES DISC provided more data sets, new tools,  and additional information to NASA Earth science data users around the world. See the article for the highlight corresponding to each picture.
Feb 12, 2014 - GES DISC "Top 10" Highlights for 2013

Achievements, accomplishments, and advances

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The AGU Fall Meeting 2013 will take place in San Francisco, CA, from December 9-13, 2013.
Dec 06, 2013 - GES DISC participates in AGU Fall Meeting 2013

GES DISC staff members are authors or co-authors on 22 presentations

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Last updated: Feb 04, 2016 03:21 PM ET