Air Pollution Transport in an Alpine Valley: Results From Airborne and Ground-Based Observations |
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| Authors: | A Gohm F Harnisch J Vergeiner F Obleitner R Schnitzhofer A Hansel A Fix B Neininger S Emeis K Schäfer |
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| Institution: | 1.Institute of Meteorology and Geophysics,University of Innsbruck,Innsbruck,Austria;2.Institut für Physik der Atmosph?re, DLR,Oberpfaffenhofen,Germany;3.Institute for Ion Physics and Applied Physics,University of Innsbruck,Innsbruck,Austria;4.MetAir AG,Menzingen,Switzerland;5.IMK-IFU,Forschungszentrum Karlsruhe,Garmisch-Partenkirchen,Germany |
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| Abstract: | An observational dataset from a wintertime field campaign in the Inn Valley, Austria, is analysed in order to study mechanisms
of air pollution transport in an Alpine valley. The results illustrate three types of mechanisms: transport by a density current,
back-and-forth transport by valley winds, and transport by slope winds. The first type is associated with an air mass difference
along the valley. Cooler air located in the lower part of the valley behaves like a density current and produces the advection
of pollutants by upvalley winds. In the second type, strong horizontal gradients in pollution concentrations exist close to
ground. Multiple wind reversals result in a back-and-forth transport of pollutants by weak valley winds. In the third type,
upslope winds during daytime decrease low-level pollution concentrations and cause the formation of elevated pollution layers. |
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| Keywords: | Aerosols ALPNAP Foehn Lidar Local winds NO x Particulate matter |
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