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Two releases of perfluorocarbon tracers have been carried out in October-November 1994 from Monterfil (Brittany, France). The evolution of the tracer cloud, as measured by 168 ground stations in Europe has been compared with the results of 28 long-range atmospheric models, operated by 24 participants from Europe and abroad in conditions as close as possible to those which would be typical of a real accident. Eight models were able to describe the cloud evolution of the first release in acceptable terms for the entire duration of the experiment (60 hours). The others were reasonably accurate in the first 24 hours, while major divergence was found in the successive period. In the second release, the experimental data indicate that only a fraction of the cloud was transported in the first 24 hours, as described by a majority of the models, while a substantial fraction was initially retained in the region of the release point and then dispersed, possibly in a series of puffs, over the next few days.

Additional information

Authors: GIRARDI F, JRC Ispra (IT);FRASER G, CEC Luxembourg (LU);KELLY G N, CEC Bruxelles (BE);KLUG W, Meteorology Institute Darmstadt (DE)
Bibliographic Reference: Paper presented: Sixth Topical Meeting on Emergency Preparedness and Response, San Francisco (US), April 22-25, 1997
Availability: Available from (1) as Paper EN 40364 ORA
Record Number: 199710271 / Last updated on: 1997-04-01
Original language: en
Available languages: en
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