Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 14 2007 10.5194/acp-7-3713-2007 http://www.atmos-chem-phys.net/7/3713/2007/ http://www.atmos-chem-phys.net/7/3713/2007/acp-7-3713-2007.html http://www.atmos-chem-phys.net/7/3713/2007/acp-7-3713-2007.pdf 3713 3736 2007-07-17 Model study of the cross-tropopause transport of biomass burning pollution B. N. Duncan bryan.n.duncan@nasa.gov S. E. Strahan Y. Yoshida S. D. Steenrod N. Livesey Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, Maryland, USA & The Atmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA We present a modeling study of the troposphere-to-stratosphere transport (TST) of pollution from major biomass burning regions to the tropical upper troposphere and lower stratosphere (UT/LS). TST occurs predominately through 1) slow ascent in the tropical tropopause layer (TTL) to the LS and 2) quasi-horizontal exchange to the lowermost stratosphere (LMS). We show that biomass burning pollution regularly and significantly impacts the composition of the TTL, LS, and LMS. Carbon monoxide (CO) in the LS in our simulation and data from the Aura Microwave Limb Sounder (MLS) shows an annual oscillation in its composition that results from the interaction of an annual oscillation in slow ascent from the TTL to the LS and seasonal variations in sources, including a semi-annual oscillation in CO from biomass burning. The impacts of CO sources that peak when ascent is seasonally low are damped (e.g. Southern Hemisphere biomass burning) and vice-versa for sources that peak when ascent is seasonally high (e.g. extra-tropical fossil fuels). Interannual variation of CO in the UT/LS is caused primarily by year-to-year variations in biomass burning and the locations of deep convection. 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