Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 1 2008 10.5194/acpd-8-403-2008 http://www.atmos-chem-phys-discuss.net/8/403/2008/ http://www.atmos-chem-phys-discuss.net/8/403/2008/acpd-8-403-2008.html http://www.atmos-chem-phys-discuss.net/8/403/2008/acpd-8-403-2008.pdf 403 452 2008-01-10 Cloud system resolving model study of the roles of deep convection for photo-chemistry in the TOGA COARE/CEPEX region M. Salzmann salzmann@mpch-mainz.mpg.de M. G. Lawrence V. T. J. Phillips L. J. Donner Max-Planck-Institute for Chemistry, Department of Atmospheric Chemistry, P.O. Box 3060, 55020 Mainz, Germany Department of Meteorology, University of Hawaii at Manoa, 2525 Correa Road, Honolulu, HI 96822, USA Geophysical Fluid Dynamics Laboratory, NOAA, Princeton University, PO Box 308, Princeton, NJ 08542, USA A cloud system resolving model including photo-chemistry (CSRMC) has been developed based on a prototype version of the Weather Research and Forecasting (WRF) model and is used to study influences of deep convection on chemistry in the TOGA COARE/CEPEX region. Lateral boundary conditions for trace gases are prescribed from global chemistry-transport simulations, and the vertical advection of trace gases by large scale dynamics, which is not reproduced in a limited area cloud system resolving model, is taken into account. The influences of in situ lightning and other processes on NO_x, O₃, and HO_x(=HO₂+OH), in the vicinity of the deep convective systems are investigated in a 7-day 3-D 248×248 km² horizontal domain simulation and several 2-D sensitivity runs with a 500 km horizontal domain. The fraction of NO_x chemically lost within the domain varies between 20 and 24% in the 2-D runs, but is negligible in the 3-D run, in agreement with a lower average NO_x concentration in the 3-D run despite a greater number of flashes. In all runs, in situ lightning is found to have only minor impacts on the local O₃ budget. Mid-tropospheric entrainment is more important on average for the upward transport of O₃ in the 3-D run than in the 2-D runs, but at the same time undiluted O₃-poor air from the marine boundary layer reaches the upper troposphere more frequently in the 3-D run than in the 2-D runs, indicating the presence of undiluted convective cores. 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