Characteristics of the NO-NO2-O3 system in different chemical regimes during the MIRAGE-Mex field campaign
1Department of Environmental Engineering, Dong-Eui University, 995 Eomgwangno, Busan 614-714, Republic of Korea
2Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000 Boulder, CO 80307, USA
3Devision of Earth Environmental System, Pusan National University, 30 Jang Jeon Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea
Abstract. 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. The ozone production efficiency (OPE) for the 5 air mass categories ranged from 4.5 (TIC) to 8.5 (FTMA), consistent with photochemical aging of air masses exiting the Mexico City Metropolitan Area.
Citation: Shon, Z.-H., Madronich, S., Song, S.-K., Flocke, F. M., Knapp, D. J., Anderson, R. S., Shetter, R. E., Cantrell, C. A., Hall, S. R., and Tie, X.: Characteristics of the NO-NO2-O3 system in different chemical regimes during the MIRAGE-Mex field campaign, Atmos. Chem. Phys., 8, 7153-7164, doi:10.5194/acp-8-7153-2008, 2008.