Directorate for Nuclear Safety and Security

Reconcialiting National Forecasts of Atmospheric Dispersion (ENSEMBLE)


   In case of another Trans-boundary scale nuclear accidents affecting Europe, National Long-range dispersion forecasts will inevitably differ because of differences in national models, differences in weather prediction methods, and differences in national emergency management strategies. However, difference in national long-range dispersion forecasts may cause problems at the European level, as National emergency management strategies based solely on national forecasts may not cohere with those in neighbouring countries. ENSEMBLE addresses the issue of harmonisation and coherence of emergency management and decision-making in relation to long range atmospheric dispersion modeling.


   The participation of the EU member states is regulated by the Council Decision 87/600 and the Recommendation 2000/473/ Euratom. The participation of non-EU countries is on a voluntary basis. There is however a gentlemen’s agreement that participating to EURDEP automatically means that data delivery will be switched to an hourly or two-hourly data-transmission during an emergency.


Austria: Central Institute for Meteorology and Geodynamics; Belgium: Institut Royal Météorologique de Belgique; Denmark: Risø National Laboratory-Department of Meteorology and Wind Energy; Finland: Finnish Meteorological Institute Air Quality Research; France: METEO-FRANCE; Germany: DWD; Greece: Demokritos; Italy: Enviroware srl; Norway: Norwegian Meteorological Institute; Poland: Institute of Atomic Energy; Sweden: Swedish Meteorological and Hydrological Institute; The Netherlands: KNMI; Laboratory of Radiation Research, RIVM; UK: UK-METOFFICE; USA: Westinghouse Savannah River Co.; Canada: Environment Canada.

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