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
SMAP Observations Can Improve Near-Surface Humidity and Temperature in GEOS Weather Analysis thumbnail

SMAP Observations Can Improve Near-Surface Humidity and Temperature in GEOS Weather Analysis

SMAP analysis improves the skill of soil moisture and screen-level air specific humidity (q2m) and daily maximum temperature (T2m_max) compared to a system without SMAP assimilation.
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Sub-city Scale Hourly Air Quality Forecasting by Combining Models with Observations thumbnail

Sub-city Scale Hourly Air Quality Forecasting by Combining Models with Observations

Air quality is a major health concern worldwide. To better understand this risk and mitigate its impact, accurate and timely air quality data are needed. A proposed method incorporating outputs of NASA’s GEOS Composition Forecasting (GEOS-CF) model system with satellite information from ESA’s TROPOspheric Monitoring Instrument (TROPOMI) and ground measurement data from the EPA network in the continental United States is described.
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2021 Greenland Ice Sheet Melt Events: A Variety Pack  thumbnail

2021 Greenland Ice Sheet Melt Events: A Variety Pack

The summer of 2021 is remarkable for a series of late-summer melt events that have covered large areas of the Greenland Ice Sheet, even extending to its highest point at Summit Station. These events have been captured in the GMAO Forward Processing (FP) analyses, and in routine numerical weather predictions produced from the GEOS forecast model.
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The Abnormally Hot June 2021 in the Western U.S.: A MERRA-2 perspective thumbnail

The Abnormally Hot June 2021 in the Western U.S.: A MERRA-2 perspective

An extreme heat wave occurred over much of the western US and southwestern Canada in late June 2021. We used daily and monthly near-surface temperature from MERRA-2 Reanalysis to compare the hot conditions of this year with the previous 40 years, particularly over the northwestern US that was severely affected.
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