Show simple item record

dc.contributor.authorOrre, Steinareng
dc.contributor.authorGao, Yongqieng
dc.contributor.authorDrange, Helgeeng
dc.contributor.authorDeleersnijder, Ericeng
dc.date.accessioned2009-03-30T14:34:03Z
dc.date.available2009-03-30T14:34:03Z
dc.date.issued2008-09-27eng
dc.identifier.citationAdvances in Atmospheric Sciences 25(5): 805-814en
dc.identifier.issn0256-1530eng
dc.identifier.urihttp://hdl.handle.net/1956/3212
dc.descriptionAuthors accepted postprint.
dc.descriptionAuthors accepted postprint version
dc.description.abstractA 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.isoengeng
dc.publisherScience Presseng
dc.subjectEquivalent diffusioneng
dc.subjectPassive tracerseng
dc.subjectAge tracerseng
dc.subjectSellafieldeng
dc.subjectDounreayeng
dc.subjectOceanographyeng
dc.subjectRadioactivityeng
dc.titleDiagnosing ocean tracer transport from Sellafield and Dounreay by equivalent diffusion and ageeng
dc.typePeer reviewedeng
dc.typeJournal articleeng
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400nob
bora.peerreviewedPeer reviewedeng
bibo.doihttp://dx.doi.org/10.1007/s00376-008-0805-yeng
dc.identifier.doihttp://dx.doi.org/10.1007/s00376-008-0805-y


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record