Variations of CO and O3 in the troposphere: Evidence of O3 photochemistry |
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| Institution: | 1. Department of Geography, National University of Singapore, Singapore;2. Institute of Water Policy in the Lee Kuan Yew School of Public Policy, National University of Singapore, Singapore;1. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China;3. Tongxiang Meteorological Bureau, Tongxiang 314500, Zhejiang Province, China;4. School of Geographic Sciences, Nantong University, Nantong, Jiangsu Province, China;5. Earth System Science Interdisciplinary Center, University of Maryland, College Park 20740, MD, USA;1. Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, 603 00 Brno, Czech Republic;2. Council for Agricultural Research and Economics (CREA), Research Centre for Forestry and Wood, Rome, Italy;3. University of Edinburgh, School of GeoSciences, Crew Bldg, Kings Bldgs, Alexander Crum Brown Rd, Edinburgh EH9 3FF, Midlothian, United Kingdom |
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| Abstract: | The possibility of a long term evolution for tropospheric ozone, connected to a rise of anthropogenic releases, raises the question of a human climatic action. In order to bring an experimental confirmation to photochemical theories, continuous CO and O3 measurements were started in November at the Pic du Midi observatory (3000 m altitude in the Pyrenean range). The results obtained confirm the photochemical hypothesis about the ozone origin. An ozone maximum is found in summer, corresponding to a CO minimum, which agrees with the increase of the u.v. flux. The seasonal variation does not exceed 19% of the value integrated over the year, which limits to 20% the maximal stratospheric contribution. The standard diurnal variations show the existence of a variable lag (0–4 h) between the O3 minimum and the CO maximum, which is interpreted as showing a photochemical O3 formation in the afternoon in the air coming from the lower layers. |
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