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 assessment of anthropogenic impacts, such as those from aircraft, future changes in atmospheric composition, and the role of long-range transport of pollution.

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.

The GMI model is compliant with the Earth System Modeling Framework (ESMF), thus facilitating incorporation of new model components.  The model has been integrated with meteorological fields from free-running GCMs and from the GEOS-4 Data Assimilation System (DAS). Recent simulations with GEOS-4-DAS include the AURA period (2004-present); output is available to the scientific community for analysis. 

What's New

Aura4 simulation with a modified Pickering and Allen lightning parameterization and updated emissions is available on dirac.gsfc.nasa.gov for Feb. 2004–Dec. 2006

Presentations from the GMI Science Team Meeting held March 17-19, 2008, in Irvine, CA.

Updated GMI User's Guide: for code versions beginning in January 2008

+ Privacy Policy and Important Notices

Technical Contact: Susan Strahan, GMI Project Manager, UMBC/GSFC Code 613.3
Authorizing NASA Official: Franco Einaudi, Director,
Earth Sciences Division, GSFC Code 610
Curator: Lara Clemence