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

Bergen Open Research Archive

Show simple item record Gao, Yongqi eng Drange, Helge eng Bentsen, Mats eng Johannessen, Ola M. eng 2005-09-14T11:27:10Z 2005-09-14T11:27:10Z 2005-08-25 eng
dc.identifier.citation Tellus B 57(4): 332-340 en
dc.identifier.issn 0280-6509 eng
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 eng
dc.format.mimetype application/pdf eng
dc.language.iso eng eng
dc.publisher Blackwell Munksgaard eng
dc.title Tracer-derived transit time of the waters in the eastern Nordic Seas eng
dc.type Journal article eng
dc.rights.holder Copyright Blackwell Munksgaard, 2005
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng
bora.journalTitle Tellus B eng
bibo.volume 57 eng
bibo.issue 4 eng
bibo.pageStart 332 eng
bibo.pageEnd 340 eng
bibo.doi eng

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