Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-27611-2009 http://www.atmos-chem-phys-discuss.net/9/27611/2009/ http://www.atmos-chem-phys-discuss.net/9/27611/2009/acpd-9-27611-2009.html http://www.atmos-chem-phys-discuss.net/9/27611/2009/acpd-9-27611-2009.pdf 27611 27648 2009-12-21 Can a global model chemical mechanism reproduce NO, NO₂, and O₃ measurements above a tropical rainforest? R. C. Pike rachel.pike@atm.ch.cam.ac.uk J. D. Lee P. J. Young S. Moller G. D. Carver X. Yang P. Misztal B. Langford D. Stewart C. E. Reeves C. N. Hewitt J. A. Pyle Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK National Centre for Atmospheric Science (NCAS), University of York, Heslington, York, YO10 5DD, UK Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK National Centre for Atmospheric Science�Climate, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK Centre for Ecology and Hydrology Edinburgh, Bush Estate, Penicuik, Midlothian, EH26 0QB, UK The University of Edinburgh, School of Chemistry, Joseph Black Building, West Mains Road, Edinburgh, EH9 3JJ, UK Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK now at: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO, 80501, USA now at: Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AH, UK A cross-platform field campaign, OP3, was conducted in the state of Sabah in Malaysian Borneo between April and July of 2008. Among the suite of observations recorded, the campaign included measurements of NO_x and O₃–crucial outputs of any model chemistry mechanism. We describe the measurements of these species made from both the ground site and aircraft. We examine the output from the global model p-TOMCAT at two resolutions for this location during the April campaign period. The models exhibit reasonable ability in capturing the NO_x diurnal cycle, but ozone is overestimated. We use a box model containing the same chemical mechanism to explore the weaknesses in the global model and the ability of the simplified global model chemical mechanism to capture the chemistry at the rainforest site. We achieve a good fit to the data for all three species (NO, NO₂, and O₃), though the model is much more sensitive to changes in the treatment of physical processes than to changes in the chemical mechanism. 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