Photochemical and meteorological relationships during the Texas-II Radical and Aerosol Measurement Project (TRAMP) |
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| Authors: | Barry Lefer Bernhard Rappenglück James Flynn Christine Haman |
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| Affiliation: | 1. E.R.L., Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, N.C.S.R. Demokritos, 15310 Ag. Paraskevi, Attiki, Greece;2. Department of Chemistry, University of Patras, 26500 Patras, Achaia, Greece;3. Physics Section, International Atomic Energy Agency, Vienna International Centre, PO Box 100, A-1400 Vienna, Austria;4. Institute of Nuclear and Particle Physics, NCSR “Demokritos”, 153 10 Ag. Paraskevi, Athens, Greece;5. Ruder Boskovic Institute, Bijenicka 54, P.O. Box 180, 10002 Zagreb, Croatia;1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;4. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, P.O.Box 64, 00014 University of Helsinki, Helsinki, Finland;5. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;6. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China |
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| Abstract: | The Moody Tower measurement site at the University of Houston experienced several large ozone events during the Texas-II Radical and Aerosol Measurement Project (TRAMP) campaign between 13 Aug–02 Oct, 2006. This rooftop site samples that atmosphere 70 m a.g.l. and consequently is less susceptible to local surface emissions. Several high-ozone episodes encountered at Moody Tower during the TRAMP campaign were preceded one to two days earlier by a cold front passage, creating a situation where polluted air is transported from the North interacts with local Houston emissions and with light local winds. High quality CO measurements were good indicators of long range transport of pollution and/or biomass burning. During TRAMP there were also 4 periods with low “background” CO characterized by southerly winds, overcast conditions and low NOx and O3 mixing ratios. The summer and fall of 2000 was an unusually hot period in Houston with considerably higher ozone levels than the 2000–2007 climatology. The 2006 TRAMP time period is more representative of the typical conditions for these 8 years. Over the time period from 1991 to 2009 the number of 8-h ozone episode days in Houston has decreased, as have the peak 1-h ozone mixing ratios. It is not possible from this analysis to demonstrate whether these improvements in Houston air quality are due to reductions in NOx levels, VOCs levels, and/or changes in meteorology. |
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