Aerosol and trace gas concentrations observed by satellites and ground stations will be assimilated in the Goddard Earth Observing System Model (GEOS). This will provide global, three-dimensional gridded atmospheric composition distributions for the period 2008-2018. Fields for 2008-2018 will be provided, based on the GEOS-CF (Composition Forecasting) system.
The GEOS-CF system has been enhanced and final tests will now be run for an extended period. Retaining the 72-layer, quarter-degree configuration, the updated GEOS model is now being run with assimilation of atmospheric constituents (aerosols, ozone, nitrogen dioxide (NO2), and sulfur dioxide (SO2)) from a variety of observation sources. Testing and benchmarking of this system is underway. Once the evaluation is complete, the reanalysis for the 2008-2018 period will be initialized and run to completion. The bulk of the work has been on preparation for the assimilation of the multiple input datasets, implementation and evaluation of the NO2 assimilation, and the development of new monitoring and evaluation diagnostics, tested on the Global Modeling and Assimilation Office's (GMAO) real-time GEOS-CF system. These diagnostics are released daily on the GMAO’s web site.
| Platforms | Temporal Frequency | Horizontal Resolution | Geographic Domain | Vertical Resolution | Thematic Areas |
|---|---|---|---|---|---|
| Terra, Aqua, Aura, Suomi National Polar-orbiting Partnership (NPP), Joint Polar Satellite System (JPSS)-1, JPSS-2, Sentinel-5 precursor | Hourly (selected surface fields), Daily | 25 km | Global | 72 layers, surface to mesosphere | Atmospheric Composition |
Assimilation of additional aerosol and trace gas concentration data is improving the GEOS-CF system’s representation of atmospheric composition, with benefits ranging from historical reanalysis of trends and outlier events to improved forecasts for air quality monitoring and pollution regulation.
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