An unusual springtime ozone episode at high elevation in the Swiss Alps: contributions both from cross-tropopause exchange and from the boundary layer |
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| Institution: | 1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2. State Key Joint Laboratory of Environment Simulation and Pollution Control (Peking University), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;1. Department of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China;2. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing 100124, China;3. Center for Satellite Application on Ecology and Environment, Beijing 100094, China |
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| Abstract: | An unusually “smooth” springtime ozone episode (maximum 97 ppb(v)) at the Jungfraujoch Observatory (3580 m asl) in the Swiss Alps is described. Analysis of meteorological variables is combined with back-trajectory analysis, and numerical simulations from a mesoscale model nested within a limited area model to examine the origin of the episode. Cross-tropopause exchange on the western flank of an upper trough, deep convection in a Gulf of Genoa cyclone, and the northwards advection of boundary-layer air (with possible in situ photochemistry) all combined to produce the highest ozone concentration of the year (1987) at the mountain site. |
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