Background
Aerosol and trace gas concentrations observed by satellites and ground stations will be assimilated in the Goddard Earth Observing System (GEOS) model. This will provide global, three-dimensional gridded atmospheric composition distributions for the period 2008-2018 based on the GEOS-CF (Composition Forecasting) system.
Status: In Development
Version 2 of GEOS-CF has been adapted for this reanalysis. The following constituents will be assimilated: aerosols, ozone (O3), water vapor (H2O), nitric acid (HNO3), nitrous oxide (N2O), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and nitrogen dioxide (NO2). Based on the results of final testing, sulfur dioxide (SO2) will not be assimilated in this product. Similarly, system testing revealed that including the infrared bands in the ozone assimilation does not improve the product sufficiently to justify the additional expense. Apart from some minor modifications to the NO2 assimilation the system is ready to commence production. Pre-production testing showed that generation of the reanalysis for 2008-2018 will take less than one year if split into two parallel streams.
Solution Characteristics
| Platforms and Instruments | Aura: Ozone Monitoring Instrument (OMI), Microwave Limb Sounder (MLS) |
|---|---|
| Aqua: Atmospheric Infrared Sounder (AIRS) | |
| Greenhouse Gases Observing SATellite (GOSAT): Thermal And Near infrared Sensor for carbon Observation (TANSO)- Cloud and Aerosol Imager (CAI), TANSO-Fourier Transform Spectrometer (FTS) | |
| International Space Station (ISS): Sage III | |
| Orbiting Carbon Observatory-2 (OCO-2): Spectrometers | |
| Sentinel-5 Precursor: TROPOspheric Monitoring Instrument (TROPOMI) | |
| Suomi National Polar-orbiting Partnership (Suomi NPP), NOAA-20/21: Ozone Mapping and Profiler Suite (OMPS), Cross-track Infrared Sounder (CrIS) | |
| Terra: Measurements of Pollution In The Troposphere (MOPITT) | |
| Output Variables | Reanalysis of NO2, O3, CH4, CO2, CO, HCl, HNO3, N2O, H2O |
| Temporal Coverage | 2008-2018 |
| Spatial Coverage | Global |
| Spatial Resolution | 25 km |
| Vertical Resolution | 72 layers, surface to mesosphere |
| Data Format | NetCDF4 (HDF5 compatible) |
Societal Impact
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.
Solution Resources
Need help using this Satellite Needs Working Group (SNWG) solution? For more information, visit GMAO - GEOS-CF.