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• W1974433744 abstract "The influence of mountain venting over the Alps on ozone (O 3 ) mixing ratios in the lower free troposphere (FT) and on export of European emissions was investigated with a Lagrangian chemical box‐model system. During summertime fair‐weather conditions mountain venting is an efficient tropospheric lifting mechanism that carries atmospheric boundary layer (ABL) pollutants to the FT. Little is known about the effect of mountain venting on net O 3 production in the FT. Chemistry in a FT and an ABL air parcel was initialized with typical European summertime background FT and Alpine ABL mixing ratios, respectively, which were derived from measurements. A parameterization was developed based on previous quantification of mountain venting in the Swiss Alps, describing the injection of air from the ABL into the FT. For simulations at constant altitude (3500 m above mean sea level (MSL)), net O 3 production was generally positive for day 0 of the simulation, when mountain venting occurred. Whether O 3 was produced or destroyed from day 1 onward critically depended on initial nitrogen oxides (NO x ) plus peroxy acetyl nitrates (PANs) mixing ratios in the ABL, and to a smaller extent on initial H 2 O and O 3 mixing ratios, photolysis rates, and PANs chemistry. For a simulation period of 8 days O 3 mixing ratios remained higher in the simulations with venting than in simulations for the FT background without venting. Simulations on cluster average forward trajectories initialized over the Alps showed that European emissions vented in the Alps have a strong influence on the Mediterranean region. O 3 production on these trajectories was enhanced by the release of NO x from PANs that acted as a reservoir species while the air parcel was descending over the Mediterranean. The O 3 production efficiency with regard to NO x was about 20 molecules O 3 produced per molecule NO x consumed at 3500 m MSL on day 0 of the venting simulation. On the southward moving trajectories O 3 production efficiency was in the range of 6–11 until day 3 of the simulation when all injected NO y was consumed." @default.
• W1974433744 created "2016-06-24" @default.
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• W1974433744 date "2005-11-27" @default.
• W1974433744 modified "2023-10-13" @default.
• W1974433744 title "Influence of mountain venting in the Alps on the ozone chemistry of the lower free troposphere and the European pollution export" @default.
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• W1974433744 doi "https://doi.org/10.1029/2005jd005936" @default.
• W1974433744 hasPublicationYear "2005" @default.
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