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dc.contributor.authorMakinson, Keitheng
dc.contributor.authorSchröder, Michaeleng
dc.contributor.authorØsterhus, Sveineng
dc.date.accessioned2006-04-28T08:37:00Z
dc.date.available2006-04-28T08:37:00Z
dc.date.issued2006-03-30eng
dc.identifier.citationJournal of Geophysical Research 2006 111:C3
dc.identifier.issn0148-0227eng
dc.identifier.urihttp://hdl.handle.net/1956/1163
dc.description.abstractThe ice front region of Ronne Ice Shelf lies near the critical latitude of the semidiurnal M2 tide, the principal tidal constituent in the southern Weddell Sea. Here the Coriolis frequency almost equals the M2 tidal frequency, resulting in a strong dependence of the M2 tidal currents on depth and stratification and a boundary layer that can occupy the entire water column. Using data from four long-term moorings along Ronne Ice Front, we confirm the presence of strongly depth-dependent semidiurnal tidal currents and their sensitivity to changes in stratification. The time series show dramatic seasonal changes in tidal current profiles and significant interannual variability. During periods of stratification, the amplitude of the semidiurnal tides in the mid–water column shows a twofold increase and, despite being several kilometers offshore from the ice front, the tidal currents clearly show a second boundary layer originating from the adjacent ice shelf base. Together, these two boundary layers occupy most of the water column, up to 600 m deep, until intense sea ice formation and the production of High-Salinity Shelf Water erodes the vertical stratification. During winter when homogeneous conditions prevail, a single bottom boundary layer occupies the entire water column at some locations. This strong seasonality and sensitivity of the M2 tidal current to stratification highlights the difficulties of interpreting current data from short-term moorings while demonstrating that it is the best indicator for characterizing changes in stratification after direct observations of density variations.en
dc.format.extent1749063 byteseng
dc.format.mimetypeapplication/pdfeng
dc.language.isoengeng
dc.publisherAmerican Geophysical Unioneng
dc.titleEffect of critical latitude and seasonal stratification on tidal current profiles along Ronne Ice Front, Antarcticaeng
dc.typeJournal articleeng
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452nob
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Geofag: 450nob
bibo.doihttp://dx.doi.org/10.1029/2005JC003062eng
dc.identifier.doihttp://dx.doi.org/10.1029/2005JC003062


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