Environmental Engineering Reference
In-Depth Information
3. Conclusions
Numerical simulations performed with the SNAP model confirmed that the direct
transport of radioactivity from Novaya Zemlya to Bergen, related to three large
nuclear explosions on 12th, 15th and 18th October 1958 did not take place. There-
fore, the elevated levels of radioactivity measured in Bergen on 20 October 1958
can not be explained in this way. On the other hand, analysis of potential vorticity
together with the model simulation of stratospheric intrusion on 20 October 1958
strongly indicate, that this is the most likely mechanism causing high level of
radioactivity measured in Bergen. This study is an example of the SNAP model
application to historical simulations with the use of meteorological data from the
ERA40 re-analysis.
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