Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-24477-2009 http://www.atmos-chem-phys-discuss.net/9/24477/2009/ http://www.atmos-chem-phys-discuss.net/9/24477/2009/acpd-9-24477-2009.html http://www.atmos-chem-phys-discuss.net/9/24477/2009/acpd-9-24477-2009.pdf 24477 24510 2009-11-17 Impact of mineral dust on nitrate, sulfate, and ozone in transpacific Asian pollution plumes T. D. Fairlie t.d.fairlie@nasa.gov D. J. Jacob J. E. Dibb B. Alexander M. A. Avery A. van Donkelaar L. Zhang NASA Langley Research Center, Hampton, VA 23681-0001, USA Dept. Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA Division of Engineering and Applied Science, Harvard University, Cambridge, MA 02138 USA Climate Change Research Center, University of New Hampshire, Durham, NH 03824, USA Dept. Atmospheric Sciences, University of Washington, Seattle, WA 98195, USA Dept. Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada We use a 3-d global chemical transport model (GEOS-Chem) to interpret aircraft observations of nitrate and sulfate partitioning in transpacific dust plumes during the INTEX-B campaign of April–May 2006. The model includes explicit transport of size-resolved mineral dust and its alkalinity, nitrate, and sulfate content. The observations show that particulate nitrate is primarily associated with dust, sulfate is primarily associated with ammonium, and Asian dust remains alkaline across the Pacific. This can be reproduced in the model by using a reactive uptake coefficient for HNO₃ on dust (γ(HNO₃)~10^−3) much lower than commonly assumed in models and likely reflecting limitation of uptake by dust dissolution. The model overestimates gas-phase HNO₃ by a factor of 2–3, typical of previous model studies; we show that this cannot be corrected by uptake on dust. 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