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Impact of clouds and aerosols on ozone production in Southeast Texas
Authors:James Flynn  Barry Lefer  Bernhard Rappenglück  Michael Leuchner  Ryan Perna  Jack Dibb  Luke Ziemba  Casey Anderson  Jochen Stutz  William Brune  Xinrong Ren  Jingqiu Mao  Winston Luke  Jennifer Olson  Gao Chen  James Crawford
Affiliation:1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, China;2. Chengdu Academy of Environmental Sciences, Chengdu, China;3. Beijing Innovation Center for Engineering Sciences and Advanced Technology, Peking University, 100871, Beijing, China;1. Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth and Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. School of Physics and Centre for Climate and Air Pollution Studies, National University of Ireland Galway, Galway, Ireland;3. Centre for Atmospheric and Marine Sciences, Xiamen Huaxia University, Xiamen 361024, China;4. Shanghai Key Laboratory of Meteorology and Health, Shanghai 200030, China;5. The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China;6. Department of Environmental Sciences and Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;7. RCE-TEA, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;8. Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;9. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;2. Institute of Energy and Climate Research: Troposphere (IEK-8), Forschungszentrum Juelich GmbH, Juelich, Germany;3. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
Abstract:A radiative transfer model and photochemical box model are used to examine the effects of clouds and aerosols on actinic flux and photolysis rates, and the impacts of changes in photolysis rates on ozone production and destruction rates in a polluted urban environment like Houston, Texas. During the TexAQS-II Radical and Aerosol Measurement Project the combined cloud and aerosol effects reduced j(NO2) photolysis frequencies by nominally 17%, while aerosols reduced j(NO2) by 3% on six clear sky days. Reductions in actinic flux due to attenuation by clouds and aerosols correspond to reduced net ozone formation rates with a nearly one-to-one relationship. The overall reduction in the net ozone production rate due to reductions in photolysis rates by clouds and aerosols was approximately 8 ppbv h?1.
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