Author(s)

S. Emeis and G. Grell

Abstract

Numerical Modelling of Flow and Air Chemistry in a Large Alpine Valley Guest contribution S. Emeis and G. Grell Fraunhofer-Institutfiir Atmospharische Umweltforschung, Kreuzeckbahnstr. 19, D-82467 Garmisch-Partenkirchen, Germany Introduction The Mesolcina valley in the Alps south of the San Bernardino pass has been chosen for the VOTALP valley experiment in order to study the formation of photo-oxidants and the thermally driven transport of pollutants into an alpine valley from the surrounding forelands. High ozone concentrations have been frequently reported from this and adjacent valleys during photosmog-episodes. VOTALP is an EU project dealing with ozone transport in the Alps. Surface, radiosonde, and aircraft measurements have been made during two summer- smog episodes in 1996 in this valley. Afterwards a combined mesoscale meteorology-chemistry model was used to simulate numerically

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