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The tracer suite and full chemistry simulations with MERRA2 1980-2016 are now available at 1x1.25 and 2x2.5 degree resolution!

Please see the Simulations page for details.


The Global Modeling Initiative (GMI) is part of the NASA Modeling Analysis and Prediction (MAP) program GMI investigations support the development and integration of a state-of-the-art modular 3-D chemistry and transport model (CTM) that includes full chemistry for both the troposphere and stratosphere. The GMI model is involved in the assessment of the impacts of atmospheric composition change due to anthropogenic emissions of gases and aerosols, such as those from aircraft, biomass burning, fossil fuel combustion, and production of ozone depleting substances. GMI studies investigate changes in stratospheric ozone and the roles of long-range transport and changing emissions on air quality.

The GMI model serves as a testbed for different meteorological fields, emissions, microphysical mechanisms, chemical mechanisms, deposition schemes, and other processes determining atmospheric composition, both gas-phase and aerosol. This enables GMI to work in close collaboration with the chemistry-climate modeling community. GMI seeks to understand and constrain the uncertainties in model results through intercomparison of simulations and through comparison with observations.

We invite the scientific community to use our simulations in their research. Most recent simulations have been integrated with meteorological fields from the MERRA reanalysis from 1979-2015.