Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 1 2008 10.5194/acpd-8-1505-2008 http://www.atmos-chem-phys-discuss.net/8/1505/2008/ http://www.atmos-chem-phys-discuss.net/8/1505/2008/acpd-8-1505-2008.html http://www.atmos-chem-phys-discuss.net/8/1505/2008/acpd-8-1505-2008.pdf 1505 1548 2008-01-29 Impact of surface emissions to the zonal variability of tropical tropospheric ozone and carbon monoxide for november 2004 K. W. Bowman kevin.bowman@jpl.nasa.gov D. Jones J. Logan H. Worden F. Boersma R. Chang S. Kulawik G. Osterman J. Worden Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA Department of Physics, University of Toronto, Toronto, Canada School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA Department of Chemistry, University of Toronto, Toronto, Canada now at: National Center for Atmospheric Research, Boulder, CO, USA The chemical and dynamical processes governing the zonal variability of tropical tropospheric ozone and carbon monoxide are investigated for November 2004 using satellite observations, in-situ measurements, and chemical transport models in conjunction with inverse-estimated surface emissions. Vertical ozone profile estimates from the Tropospheric Emission Spectrometer (TES) and ozone sonde measurements from the Southern Hemisphere Additional Ozonesondes (SHADOZ) network show the so-called zonal "wave-one" pattern, which is characterized by peak ozone concentrations (70–80 ppb) centered over the Atlantic, as well as elevated concentrations of ozone over Indonesia and Australia (60–70 ppb) in the lower troposphere. Observational evidence from TES CO vertical profiles and Ozone Monitoring Instrument (OMI) NO₂ columns point to regional surface emissions as an important contributor to the elevated ozone over Indonesia. This contribution is investigated with the GEOS-Chem chemistry and transport model using surface emission estimates derived from an optimal inverse model, which was constrained by TES and Measurements Of Pollution In The Troposphere (MOPITT) CO profiles (Jones et al., 2007). 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