GMAO - Goddard Earth Observing System (GEOS) for Instrument Teams

Earth Sciences Division Sciences and Exploration

Reanalysis Long-term, model-based analyses of multiple datasets using a fixed assimilation system are a major focus in the GMAO. Building on the success of the atmospheric reanalyses conducted with GEOS, current research and development activities are directed at producing a major Earth System Reanalysis, including atmosphere, land, ocean, and ice.
Weather Analysis & Prediction To support NASA's satellite missions and field experiments, GMAO generates near-real-time atmospheric products using GEOS and distributes them to a broad community of users.
Seasonal-Decadal Analysis & Prediction GMAO uses coupled Earth-System models and analyses, along with a broad range of satellite observations, to study and predict phenomena that evolve on seasonal to decadal timescales.
Global Mesoscale Modeling Current computing capacity enables GMAO to simulate the entire globe at spatial resolutions previously only possible with regional models. These “global mesoscale model” simulations serve for forefront evaluations of model performance and form the basis for Observing System Simulation Experiments.
Observing System Science GMAO's mission to provide modeling support for NASA's satellite observations encompasses the need to examine the impacts of different observation types in weather and climate prediction. It also requires the ability to simulate potential new observation types, in order to assess their cost benefit, based on their likely impacts on prediction.
Explore
- GMAO Mission GMAO Products NASA Mission Support Field Campaign Support Multi-Partner Projects Research Briefs Science Snapshots GEOS Systems Publications Seminars & Workshops Staff Directory Contact Information Employment Intranet (internal) Extranet (login required)

Home
GMAO Products
GEOS IT
Documentation

File Mapping
Documentation
Near-Real Time Products

Documentation

Cubed-Sphere Grid Description May 2021

Converting Cubed Sphere Data to Lat Lon

GEOS-IT User Meeting - April 3, 2024

GEOS-IT File Spec Tables

Oct. 2021 GEOS-IT sample data review presentation

June 2021 Update on GEOS-IT

File Specification for GEOS FP-IT

Related Information

GMAO Reanalysis Products
View current GMAO production status.
GEOS FP (GEOS FP)
GEOS FP-IT (GEOS FP-IT)
GEOS Composition Forecasts (GEOS-CF)
GEOS Near-Real Time Data Products (GEOS Near-Real Time Data Products)
GEOS Sub-seasonal / Seasonal Project, Version 2 (GEOS-S2S)
GEOS Experimental Seasonal Forecasts (GEOS-S2S-1)
Atmosphere-Ocean General Circulation Model (AOGCM)
Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2)
Modern-Era Retrospective analysis for Research and Applications (MERRA)
MERRA-Land (MERRA-Land)
Modern Era Retrospective analysis for Research and Applications Aerosol Reanalysis (MERRAero)
MERRA-NOBM (MERRA-NOBM)
Non-hydrostatic 7 km Global Mesoscale Simulation (7km-G5NR)
Hurricane and Severe Storm Sentinel (HS3) Forecast Support (HS3)
DISCOVER-AQ 2014 Campaign GEOS-5 Forecasting Support (DISCOVER-AQ)
DYAMOND Phase II (DYAMOND Phase II)
Observing System Simulation Experiments (OSSEs)
SMAP Level-4 Products (SMAP L4)

Privacy Policy & Important Notices
NASA's Accessibility Statement
Contact Us
Website Question & Feedback

Responsible NASA Official: Steven Pawson
Web Curator: Thang Do
Page Last Updated: 02/06/2025