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dc.contributor.authorMarzeion, Beneng
dc.contributor.authorDrange, Helgeeng
dc.date.accessioned2006-01-18T16:55:46Z
dc.date.available2006-01-18T16:55:46Z
dc.date.issued2006eng
dc.identifier.citationDeep Sea Research Part II: Topical Studies in Oceanography 53(1-2): 226-238
dc.identifier.issn0967-0645eng
dc.identifier.urihttp://hdl.handle.net/1956/1043
dc.description.abstractA three-box model of the Atlantic Ocean is used to examine the influence different parameterisations of the diapycnal mixing may have on the large scale dynamics of the ocean circulation. Special emphasis is given to the northward volume and heat transports. The vertical diffusivity κ is taken in the general form κ ~ N −α , where N is the buoyancy frequency, and the parameter space 0 ≤ α ≤ 3 is explored. An imposed freshwater forcing of the northern high latitude box is used as a test case to investigate the behaviour of the model compared to similar types of sensitivity experiments carried out with, for instance, General Circulation Models. Four different solution states are identified, separated by three critical values of α. For small values of α, both heat and volume fluxes decrease with increasing freshwater flux. Increasing α leads first into a parameter domain where the transport of heat increases with increasing freshwater forcing, then at even higher α also the volume transport increases. Finally, a fourth state is found where strong advection of warm water leads to an increase of the northern box temperature, as opposed to cooling for small α. The behaviour of the critical values of α is discussed with respect to model dynamics and parameters. A subtle interplay between changes in the ther- mocline depth and the advective fluxes from the thermocline box into northern box, which both are modulated by diapycnal mixing, is found to be the key process in determining the behaviour of the model. Finally, the implications for modelling and understanding of basic features of the ocean circulation are discussed.en
dc.format.extent334200 byteseng
dc.format.mimetypeapplication/pdfeng
dc.language.isoengeng
dc.publisherElsevier Scienceeng
dc.subjectOceanographyeng
dc.subjectMeridional oceanic circulationeng
dc.subjectModellingeng
dc.subjectVertical mixingeng
dc.subjectThermoclineeng
dc.titleDiapycnal Mixing in a Conceptual Model of the Atlantic Meridional Overturning Circulationeng
dc.typeJournal articleeng
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400nob
dc.type.versionSubmittedVersioneng
bora.journalTitleDeep Sea Research Part II: Topical Studies in Oceanographyeng
bibo.volume53eng
bibo.issue1-2eng
bibo.pageStart226eng
bibo.pageEnd238eng
bibo.doihttp://dx.doi.org/10.1016/j.dsr2.2005.08.022eng
dc.identifier.doihttp://dx.doi.org/10.1016/j.dsr2.2005.08.022


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