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Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica

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dc.contributor.author Nicholls, Keith W. eng
dc.contributor.author Østerhus, Svein eng
dc.date.accessioned 2004-08-10T12:38:56Z
dc.date.accessioned 2004-08-26T11:57:33Z
dc.date.available 2004-08-10T12:38:56Z
dc.date.available 2004-08-26T11:57:33Z
dc.date.issued 2004-04-20 eng
dc.identifier.issn 0148-0227 eng
dc.identifier.uri http://hdl.handle.net/1956/372
dc.description.abstract Multiyear time series of ocean current and temperatures from beneath Filchner-Ronne Ice Shelf, Antarctica, demonstrate both seasonal and interannual variability. The seasonal signal is visible at all measurement sites, although it was swamped for a 2-year period (1999–2001) when extraordinarily light sea-ice cover in the southern Weddell Sea during the 1997–1998 Austral summer caused an anomalously large pulse of High Salinity Shelf Water to flush beneath the ice shelf. The pulse was observed twice at an instrumented site near the Berkner Island coast, once on its way to the Filchner Depression and once after the signal had propagated around the depression and returned to the site as an anomalously large pulse of Ice Shelf Water. The timings of the signal allow an estimate of 24–30 months for the flushing timescales of the sub-ice shelf ocean cavity, indicating that the cavity is highly responsive to external forcing. A timescale for the full ventilation of the cavity of 4–5 years is obtained from the length of time the sub-ice shelf conditions take to return to their original state, a timescale significantly shorter than previous estimates. en
dc.format.extent 38782 bytes eng
dc.format.extent 137 bytes eng
dc.format.extent 1151035 bytes eng
dc.format.mimetype text/plain eng
dc.format.mimetype text/plain eng
dc.format.mimetype application/pdf eng
dc.language.iso eng eng
dc.publisher American Geophysical Union eng
dc.title Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica eng
dc.type Journal article eng
dc.rights.holder Copyright 2004 the American Geophysical Union
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng
bora.journalTitle Journal of Geophysical Research eng
bibo.volume 109 eng
bora.cristinID 420748 eng
bibo.number C04014 eng
bibo.doi http://dx.doi.org/10.1029/2003JC002149 eng
dc.identifier.cristinID 420748 eng
dc.identifier.doi http://dx.doi.org/10.1029/2003JC002149


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