The ozone record at Payerne: An assessment of the cross-tropopause flux |
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| Institution: | 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Xinjiang 830011, Urumqi, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Geographical Processes and Ecological Security of Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, People''s Republic of China;4. Climate Lab, Institute of Geography, University of Bremen, 28359 Bremen, Germany;5. Tianshan Station for Snow Cover and Avalanche Research, Chinese Academy of Sciences, Xinyuan 835800, China;6. Research Center for Ecology and Environment in Central Asia, Chinese Academy of Sciences, Urumqi 830011, China;7. Xinjiang Key Laboratory of Water Cycle and Utilization in Arid Zone, Urumqi 830011, China;1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;4. Ningbo Ecological Environment Monitoring Center of Zhejiang Province, Ningbo 315012, China;5. The Institute of Urban Environment, Chinese Academy of Sciences (CAS), Xiamen 361021, China;6. University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Ozone soundings from the 21-year record at Payerne (47°N, 7°E) are analysed. At the 300 mb level a simple statistical technique makes it possible to distinguish between the ozone of tropospheric photochemical origin and that in stratospheric intrusions. It is estimated that stratospheric intrusion is the source of 25% of the observed ozone mixing ratio at 300 mb. The maximum stratosphere to troposhere flux of ozone occurs in late winter/spring.A box model is developed for a Northern Hemisphere troposphere with stratosphere-troposphere exchange parameterized in terms of the baroclinic eddy activity but no tropospheric in situ source of ozone. It shows the same seasoanlity in ozone mixing ratio as the Payerne data, suggesting the assumed exchange mechanism to be reasonable. |
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