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This paper describes some results from a full scale tracer experiment in which the atmospheric dispersion in a lake-mountain area was investigated. The experiments were carried out under the conditions of a cold lake surface and a well developed anabatic wind on the heated slope of the mountain. The height difference between the lake surface and mountain ridge is about 800 m. The tracer was released upwind of the lake under very unstable atmospheric conditions, with light wind. The measurements show that the effect of the cold lake surface delays the arrival of the tracer plume to the downwind lake-shore. A strong channelling effect on the plume is created by the mountain. The tracer concentration on the mountain ridge and leeward is affected by a strong vertical wind component before the ridge. An attempt to simulate the dispersion by a segmented plume model failed. In these experiments, use was made of the perfluorocarbon tracer technique, which is described in detail.

Additional information

Authors: GAGLIONE P, JRC Ispra Estab. (IT);GRAZIANI G, JRC Ispra Estab. (IT);GRYNING S E, Riso National Laboratory, Roskilde (DK)
Bibliographic Reference: Paper presented: International Workshop "Meteorology and Atmospheric Dispersion in a Coastal Area", Roskilde (DK), Oct. 25-27, 1988
Availability: Available from (1) as Paper EN 34223 ORA
Record Number: 198910235 / Last updated on: 1994-12-01
Original language: en
Available languages: en