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http://hdl.handle.net/1956/372
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| Title: | Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
| Authors: | Nicholls, K. W.
Østerhus, S. |
| Issue Date: | 20-Apr-2004 |
| Publisher: | American Geophysical Union |
| Citation: | Nicholls, K. W., and S. Østerhus (2004), Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica, J. Geophys. Res., 109, C04014, doi:10.1029/2003JC002149. |
| Series/Report no.: | Journal of geophysical research. C, Oceans;109 |
| 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 o... |
| URI: | http://hdl.handle.net/1956/372 |
| Appears in Collections: | Eprints by the Bjerknes Centre for Climate Research (BCCR)
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