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Dense water formation and circulation in the Barents Sea

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Show simple item record Årthun, Marius eng Ingvaldsen, Randi eng Smedsrud, Lars Henrik eng Schrum, Corinna eng 2011-10-20T11:32:27Z 2011-10-20T11:32:27Z 2011 eng
dc.identifier.citation Deep Sea Research Part I: Oceanographic Research Papers 58(8): 801-817 en
dc.description.abstract Dense water masses from Arctic shelf seas are an important part of the Arctic thermohaline system. We present previously unpublished observations from shallow banks in the Barents Sea, which reveal large interannual variability in dense water temperature and salinity. To examine the formation and circulation of dense water, and the processes governing interannual variability, a regional coupled ice-ocean model is applied to the Barents Sea for the period 1948-2007. Volume and characteristics of dense water are investigated with respect to the initial autumn surface salinity, atmospheric cooling, and sea-ice growth (salt flux). In the southern Barents Sea (Spitsbergen Bank and Central Bank) dense water formation is associated with advection of Atlantic Water into the Barents Sea and corresponding variations in initial salinities and heat loss at the air-sea interface. The characteristics of the dense water on the Spitsbergen Bank and Central Bank are thus determined by the regional climate of the Barents Sea. Preconditioning is also important to dense water variability on the northern banks, and can be related to local ice melt (Great Bank) and properties of the Novaya Zemlya Coastal Current (Novaya Zemlya Bank). The dense water mainly exits the Barents Sea between Frans Josef Land and Novaya Zemlya, where it constitutes 63% (1.2 Sv) of the net outflow and has an average density of 1028.07 kg m−3. 0.4 Sv enters the Arctic Ocean between Svalbard and Frans Josef Land. Covering 9% of the ocean area, the banks contribute with approximately 1/3 of the exported dense water. Formation on the banks is more important when the Barents Sea is in a cold state (less Atlantic Water inflow, more sea-ice). During warm periods with high throughflow more dense water is produced broadly over the shelf by general cooling of the northward flowing Atlantic Water. However, our results indicate that during extremely warm periods (1950s and late 2000s) the total export of dense water to the Arctic Ocean becomes strongly reduced. en
dc.language.iso eng eng
dc.publisher Elsevier eng
dc.relation.ispartof <a href="" target="blank">Water mass transformations and air-sea exchange in the Barents Sea</a> eng
dc.subject Barents Sea eng
dc.subject Dense water eng
dc.subject Cold Deep Water eng
dc.subject HAMSOM eng
dc.subject Ocean modeling eng
dc.subject Water mass transformation eng
dc.subject Sea ice eng
dc.title Dense water formation and circulation in the Barents Sea eng
dc.type Peer reviewed eng
dc.type Journal article eng
dc.subject.nsi VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 eng
dc.rights.holder Copyright 2011 Elsevier Ltd. All rights reserved.
dc.type.version acceptedVersion eng
bora.peerreviewed Peer reviewed eng
bibo.doi eng

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