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As part of the European tracer experiment (ETEX) two successful atmospheric experiments were carried out in October and November 1994. Perfluorocarbon (PFC) tracers were released into the atmosphere in Monterfil, Brittany, and air samples were taken at 169 stations in 17 European countries for 72 hours after the release. Upper air tracer measurements were made from three aircraft. During the first experiment a westerly air flow transported the tracer plume north-eastwards across Europe. During the second release the flow was eastwards. The results from the ground sampling network allowed the determination of the cloud evolution as far as Sweden, Poland and Bulgaria. Typical background concentrations of the tracer used are around 5 to 7 fl/l in ambient air. Concentrations in the plume ranged from 10 to above 200 fl/l.

The tracer release characteristics, the tracer concentrations at the ground and in upper air, the routine and additional meteorological observations at the ground level and in upper air, trajectories derived from constant level balloons and the meteorological input fields for long-range transport (LRT) models are assembled in the ETEX database. The ETEX database is accessible via the Internet. .

Additional information

Authors: NODOP K, JRC Ispra (IT);CONNOLLY R, JRC Ispra (IT);GIRARDI F, JRC Ispra (IT)
Bibliographic Reference: Paper presented: ETEX Symposium on Long Range Atmospheric Transport, Model Verification and Emergency Response, Vienna (AT), May 13-16, 1997
Availability: Available from (1) as Paper EN 40528 ORA
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