Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-2735-2009 http://www.atmos-chem-phys-discuss.net/9/2735/2009/ http://www.atmos-chem-phys-discuss.net/9/2735/2009/acpd-9-2735-2009.html http://www.atmos-chem-phys-discuss.net/9/2735/2009/acpd-9-2735-2009.pdf 2735 2761 2009-01-28 Effects of the 2006 El Niño on tropospheric ozone and carbon monoxide: implications for dynamics and biomass burning S. Chandra J. R. Ziemke jerald.r.ziemke@nasa.gov B. N. Duncan T. L. Diehl N. J. Livesey L. Froidevaux Goddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Baltimore, Maryland, USA NASA Goddard Space Flight Center, Greenbelt, Maryland, USA NASA Jet Propulsion Laboratory, Pasadena, California, USA We have studied the effects of the 2006 El Niño on tropospheric O₃ and CO at tropical and sub-tropical latitudes measured from the OMI and MLS instruments on the Aura satellite. The 2006 El Niño-induced drought allowed forest fires set to clear land to burn out of control during October and November in the Indonesian region. The effects of these fires are clearly seen in the enhancement of CO concentration measured from the MLS instrument. We have used a global model of atmospheric chemistry and transport (GMI CTM) to quantify the relative importance of biomass burning and large scale transport in producing observed changes in tropospheric O₃ and CO. The model results show that during October and November both biomass burning and meteorological changes contributed almost equally to the observed increase in tropospheric O₃ in the Indonesian region. The biomass component was 4–6 DU but it was limited to the Indonesian region where the fires were most intense. The dynamical component was 4–8 DU but it covered a much larger area in the Indian Ocean extending from South East Asia in the north to western Australia in the south. 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