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An atmospheric tracer release experiment took place in the Ticino river valley (S. Switzerland) during October 1989, in order to gain knowledge about the air mass transport processes across the Alps. This exercise is the first one of a pluriannual series of experiments; simple meteorological conditions, typical for a subalpine valley (mountain-valley breeze), were chosen. The releases were made on days 5 and 19 of October. An extended meteorological coperture network was set up and operated during the whole month. Besides the synoptic observations, meteorological data were made available through portable stations, three Doppler sounders and a sonic anemometer. Pilot balloons and tetroons were launched during the release days. The tracer concentration profiles along the valley showed a classical exponential decrease versus distance. Released at about 40 km from the main mountain range, the tracer reached the Gotthard pass. A preliminary simulation with a simple Gaussian model showed good agreement with the observed concentrations, which was surprising for a disturbed topography.

Additional information

Authors: LAMPRECHT R, Paul Scherrer Institute, Villigen (CH);CIESLIK S ET AL., JRC Ispra (IT);MARZORATI A, Ente Nazionale per l'Energia Elettrica, Milano (IT);AMBROSETTI P, Swiss Meteorological Institute, Locarno-Monti (CH);SPINEDI F, Swiss Meteorological Institute, Locarno-Monti (CH);VOGT S, Kernforschungszentrum Karlsruhe (DE);ANFOSSI D, Istituto di Cosmogeofisica del CNR, Torino (IT)
Bibliographic Reference: EUR 13474 EN (1992) 87 pp., MF, ECU 4, blow-up copy ECU 13.50
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