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Diagnosing ocean tracer transport from Sellafield and Dounreay by equivalent diffusion and age

Bergen Open Research Archive

Show simple item record Orre, Steinar Gao, Yongqi Drange, Helge Deleersnijder, Eric 2009-03-30T14:34:03Z 2009-03-30T14:34:03Z 2008-09-27
dc.identifier.citation Advances in Atmospheric Sciences 25(5): 805-814 en
dc.identifier.issn 0256-1530
dc.description Authors accepted postprint.
dc.description Authors accepted postprint version
dc.description.abstract A simple approach for estimating the equivalent diffusion for diagnosing tracer transport is proposed. Two different expressions are derived; one is based directly on an analytical solution of the two-dimensional advection-diffusion equation, the other uses the variance of the tracer distribution. To illustrate some features of the equivalent diffusion and possible applications thereof, idealized releases of passive tracers from the nuclear fuel reprocessing plants at Sellafield in the Irish Sea and Dounreay on the northern coast of Scotland have been simulated with a regional isopycnic co-ordinate Ocean General Circulation Model. Both continuous and pulse releases are considered; the former being representative of the actual historical discharges from the reprocessing plants, the latter resembling an accidental scenario. Age tracers are included to calculate the mean time elapsed since the tracers left their source regions. It is found that in the Nordic Seas the age of tracers from Dounreay is approximately 2 years younger than the age from Sellafield. Although tracers from both sources eventually end up along the same transport routes, significant qualitative differences regarding the dispersion properties are found. It is argued that one single parameter, the equivalent horizontal diffusion, which is estimated to be in the range of 20–56 m2 s−1 from Sellafield and 170–485 m2 s−1 from Dounreay, determines these differences. en
dc.language.iso eng en
dc.publisher Science Press en
dc.subject Equivalent diffusion en
dc.subject Passive tracers en
dc.subject Age tracers en
dc.subject Sellafield en
dc.subject Dounreay en
dc.subject Oceanography en
dc.subject Radioactivity en
dc.title Diagnosing ocean tracer transport from Sellafield and Dounreay by equivalent diffusion and age en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400 en

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