Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-14927-2008 http://www.atmos-chem-phys-discuss.net/8/14927/2008/ http://www.atmos-chem-phys-discuss.net/8/14927/2008/acpd-8-14927-2008.html http://www.atmos-chem-phys-discuss.net/8/14927/2008/acpd-8-14927-2008.pdf 14927 14955 2008-08-05 Significant impact of the East Asia monsoon on ozone seasonal behavior in the boundary layer of Eastern China and the west Pacific region Y. J. He yjhe@riam.kyushu-u.ac.jp I. Uno Z. F. Wang P. Pochanart J. Li H. Akimoto Earth System Science and Technology, Kyushu University, Fukuoka, Japan Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan LAPC/NZC, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, China Atmospheric Composition Research Program, Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan The impact of the East Asia monsoon on the seasonal behavior of O₃ in the boundary layer of Eastern China and the west Pacific region was analyzed for 2004–2006 by means of full-year nested chemical transport model simulations and continuous observational data obtained from three inland mountain sites in central and eastern China and three oceanic sites in the west Pacific region. The basic common features of O₃ seasonal behaviors over all the monitoring sites are the pre- and post-monsoon peaks with a summer trough. Such bimodal seasonal patterns of O₃ are predominant over the region with strong summer monsoon penetration, and become weaker or even disappear outside the monsoon region. The seasonal/geographical distribution of the pre-defined Monsoon Index indicated that the East Asia summer monsoon is responsible for the bimodal seasonal O₃ pattern, and also partly account for the differences in the O₃ seasonal variations between the inland mountain and oceanic sites. Over the inland mountain sites, the O₃ concentration increased gradually from the beginning of the year, reached a maximum in June, decreased rapidly to a minimum in July or August, and then peaked in September or October, thereafter decreased gradually again. Over the oceanic sites, O₃ abundance showed a similar increasing trend beginning in January, but then decreased gradually from the end of March, followed by a wide trough with the minimum in July and August and a small peak in October or November. 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