Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 23 2008 10.5194/acp-8-7153-2008 http://www.atmos-chem-phys.net/8/7153/2008/ http://www.atmos-chem-phys.net/8/7153/2008/acp-8-7153-2008.html http://www.atmos-chem-phys.net/8/7153/2008/acp-8-7153-2008.pdf 7153 7164 2008-12-09 Characteristics of the NO-NO₂-O₃ system in different chemical regimes during the MIRAGE-Mex field campaign Z.-H. Shon zangho@deu.ac.kr S. Madronich S.-K. Song F. M. Flocke D. J. Knapp R. S. Anderson R. E. Shetter C. A. Cantrell S. R. Hall X. Tie Department of Environmental Engineering, Dong-Eui University, 995 Eomgwangno, Busan 614-714, Republic of Korea Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000 Boulder, CO 80307, USA Devision of Earth Environmental System, Pusan National University, 30 Jang Jeon Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea The NO-NO₂ system was analyzed in different chemical regimes/air masses based on observations of reactive nitrogen species and peroxy radicals made during the intensive field campaign MIRAGE-Mex (4 to 29 March 2006). The air masses were categorized into 5 groups based on combinations of macroscopic observations, geographical location, meteorological parameters, models, and observations of trace gases: boundary layer (labeled as "BL"), biomass burning ("BB"), free troposphere (continental, "FTCO" and marine, "FTMA"), and Tula industrial complex ("TIC"). In general, NO₂/NO ratios in different air masses are near photostationary state. Analysis of this ratio can be useful for testing current understanding of tropospheric chemistry. 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