The GMAO Research Site

The Global Modeling and Assimilation Office (GMAO) supports NASA's Earth Science mission. Activities in Earth System modeling and data assimilation aim to maximize the impact of satellite observations on analyses and predictions of the atmosphere, ocean, land and cryosphere.

Science Snapshots
Science Snapshot Archive »
SAGE III/ISS Data Assimilation System Effective In Reducing Stratospheric Observational Data Gaps thumbnail

SAGE III/ISS Data Assimilation System Effective In Reducing Stratospheric Observational Data Gaps

With the primary tool for vital stratospheric water vapor observations set to reach the end of its life, a new data assimilation system (DAS) developed by past and current GMAO scientists can help fill in future data gaps using other existing sensors.
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The Stratospheric Sudden Warming of March 2025 Abruptly Ended the NH Stratospheric Polar Vortex thumbnail

The Stratospheric Sudden Warming of March 2025 Abruptly Ended the NH Stratospheric Polar Vortex

A cold stratospheric polar region characterized most of the NH winter of 2024-2025, with a major final warming in early March. The GMAO's GEOS-FP and GEOS-S2S products were able to forecast and characterize the evolution of this SSW event.
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GEOS-FP Excels At Predicting Presidents' Week Mid-Atlantic Snowfall thumbnail

GEOS-FP Excels At Predicting Presidents' Week Mid-Atlantic Snowfall

A large snowstorm struck the Mid-Atlantic just after Presidents' Day. While many NWP models had to shift their snowfall locations in the days leading up the event, GEOS-FP had the snowstorm correctly forecasted from the beginning.
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Uncertainty Quantification for Air Quality Forecasting using Multiple Data Sources thumbnail

Uncertainty Quantification for Air Quality Forecasting using Multiple Data Sources

GMAO scientists have continued their work on air quality forecasting by using various phases to lessen the level of uncertainty. See how these results can help improve forecasts and inform the public on dangerous air quality in advance.
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