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

Bergen Open Research Archive

Show simple item record Nicholls, Keith W. Østerhus, Svein 2004-08-10T12:38:56Z 2004-08-26T11:57:33Z 2004-08-10T12:38:56Z 2004-08-26T11:57:33Z 2004-04-20 en
dc.identifier.issn 0148-0227
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 1151035 bytes en
dc.format.extent 38782 bytes
dc.format.extent 137 bytes
dc.format.extent 1151035 bytes
dc.format.mimetype application/pdf en
dc.format.mimetype text/plain
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dc.language.iso eng en
dc.publisher American Geophysical Union en
dc.rights Copyright 2004 the American Geophysical Union en
dc.title Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica en
dc.type Journal article en
dc.type.version publishedVersion
bora.peerreviewed Peer reviewed
bora.journalTitle Journal of Geophysical Research
bibo.volume 109
bora.cristinID 420748
bibo.number C04014

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