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Tracer-derived transit time of the waters in the eastern Nordic Seas

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dc.contributor.author Gao, Yongqi
dc.contributor.author Drange, Helge
dc.contributor.author Bentsen, Mats
dc.contributor.author Johannessen, Ola M.
dc.date.accessioned 2005-09-14T11:27:10Z
dc.date.available 2005-09-14T11:27:10Z
dc.date.issued 2005-08-25
dc.identifier.citation Tellus B 57(4): 332-340 en
dc.identifier.issn 0280-6509
dc.identifier.uri http://dx.doi.org/10.1111/j.1600-0889.2005.00153.x
dc.identifier.uri http://hdl.handle.net/1956/790
dc.description.abstract The spatial-temporal distribution of the anthropogenic radionuclide 137Cs originating from nuclear bomb testing and the Sellafield reprocessing plant in the Irish Sea is simulated using a global version of the Miami Isopycnic Coordinate Ocean Model (MICOM). The physical model has a horizontal resolution of about 40 km, and it is forced with daily atmospheric reanalysed fields for the period 1948 to 2002. A comparison of the temporal evolution of observed and simulated concentrations of 137Cs has been conducted for the regions east of Scotland, west of central Norway and at the entrance of the Barents Sea. It follows that the annual mean 137Cs concentration signal from the Sellafield discharge reaches the southwestern Barents Sea region in 5 yr, in accordance with available observations. To more accurately assess the age of the caesium-tagged water masses, three additional experiments were performed with an Eulerian age coupled to the evolution of the tracer concentration. It is demonstrated that the transit time depends on the duration of the tracer release history, on the dynamical ocean state and on whether the transit time is derived from the time difference between the release history and the concentration evolution downstream of the release, or as an explicit Eulerian age tracer. The Eulerian age tracer gives a transit time for a Sellafield-like discharge to reach the Barents Sea of 56 months in the 1970s, 52 months in the 1960s and 51 months in the 1980s, and that this difference is strongly governed by the ocean dynamics in the Faeroe–Scotland region. en
dc.format.extent 3846165 bytes
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Blackwell Munksgaard en
dc.rights Copyright Blackwell Munksgaard, 2005
dc.title Tracer-derived transit time of the waters in the eastern Nordic Seas en
dc.type Journal article en
dc.type Peer reviewed
dc.type.version publishedVersion
bora.peerreviewed Peer reviewed
bora.journalTitle Tellus B
bibo.volume 57
bibo.issue 4
bibo.pageStart 332
bibo.pageEnd 340


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