Investigation of tracer emission and transport in GEOS-5 during ARCTAS

The NASA aircraft experiment, Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS), was conducted during April, 2008 at Fairbanks, Alaska and June - July, 2008 at Cold Lake, Canada. During ARCTAS the NASA Global Modeling and Assimilation Office ran 0.5 x 0.666 degree global 5-day forecasts of the Goddard Earth Observing System atmospheric general circulation model and data assimilation system (GEOS-5). In addition to meteorological fields, the GEOS-5 provided atmospheric distributions of aerosols, CO, and other tracers for flight planning and for data analysis. Here we examine the comparison of GEOS5 CO and aerosol with observations from the ARCTAS mission to evaluate model's sources, sinks, chemistry, and transport. We particularly highlight the events of Asian anthropogenic long- range transport during spring phase and biomass burning emission and transport during summer phase and their impact on Arctic pollution.