Atmospheric CO2 and chemistry simulations employing the NASA GEOS-5 system as configured on the ORNL/NCCS Jaguar computational platform

David Erickson (ORNL)

Abstract

The long-term goals of this project are to develop an atmosphere-land-ocean assimilation system with a specific focus on the carbon cycle.  This will be based around NASA’s GEOS-5 assimilation and modeling system, which will be extended to include an arbitrary number of trace gases.  We describe an implementation of the GEOS-5 environment on the ORNL machines, building the capability of running the GEOS-5 atmospheric general circulation model (AGCM) at a variety of resolutions.  Associated with this is the porting of physical and chemical boundary conditions (sea-surface temperatures, gaseous emission fields, etc.). One objective is to complete installation of these modeling requirements and complete three 25-year runs at resolutions of 1 degree, 0.5 degree and 0.25 degree.  Further runs, with perturbed boundary conditions, will be performed.  We examine the sensitivity of atmospheric carbon distributions to model resolution and uncertainties in sub-grid processes and surface sources.  We have produced multi-year (1970-2005) simulations of atmospheric carbon species using observed boundary conditions at various horizontal resolutions and with various estimates (from published literature and new results from this partnership) of surface sources and sinks.  Visualization tools will be featured in presenting the ongoing GEOS-5 atmospheric CO2 results.

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