GMAO - GEOS Sub-seasonal / Seasonal Project, Version 2

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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.
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Seasonal-Decadal Page

Highlights

May 23, 2024

GEOS-S2S-2 Predicts 2024 Mongolia Dzud

April 26, 2024

March 2024 Sudan Heat Wave Through GEOS-S2S-2

March 29, 2024

MJO Propagation and Associated Moist Dynamics in Version 3 of GEOS-S2S Forecast System

September 29, 2023

GEOS S2Sv2 Indian Ocean Dipole Forecast and its Potential Global Impacts

April 15, 2021

GEOS-S2S Predicted 2020 Summertime Precipitation Anomalies Three Months in Advance

June 02, 2020

Major Advance in MJO Prediction Skill in GMAO’s Near Real Time Seasonal Forecasts

May 21, 2019

Impact of Satellite Sea Surface Salinity Observations on ENSO Predictions

June 17, 2017

A New Look at the 2015-2016 El Niño

August 03, 2017

Influence of ENSO on Wintertime Precipitation

September 21, 2016

NASA/GMAO Pulls the Plug on La Niña

Related Information

GMAO Reanalysis Products
View current GMAO production status.
GEOS FP (GEOS FP)
Goddard Earth Observing System (GEOS) for Instrument Teams (GEOS IT)
GEOS Composition Forecasts (GEOS-CF)
GEOS Near-Real Time Data Products (GEOS Near-Real Time Data Products)
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)

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Page Last Updated: 08/25/2025