Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica
[1] 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 extraordinaril...
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American Geophysical Union
2004
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ftnerc:oai:nora.nerc.ac.uk:12319 2023-05-15T13:45:11+02:00 Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica Nicholls, K.W. Østerhus, S. 2004 http://nora.nerc.ac.uk/id/eprint/12319/ http://www.agu.org/journals/jc/jc0404/2003JC002149/index.html unknown American Geophysical Union Nicholls, K.W. orcid:0000-0002-2188-4509 Østerhus, S. 2004 Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica. Journal of Geophysical Research, 109 (C4), C04014. 9, pp. https://doi.org/10.1029/2003JC002149 <https://doi.org/10.1029/2003JC002149> Marine Sciences Glaciology Publication - Article PeerReviewed 2004 ftnerc https://doi.org/10.1029/2003JC002149 2023-02-04T19:27:55Z [1] 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. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea Natural Environment Research Council: NERC Open Research Archive Weddell Sea Austral Weddell Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Journal of Geophysical Research 109 C4 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Glaciology |
spellingShingle |
Marine Sciences Glaciology Nicholls, K.W. Østerhus, S. Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
topic_facet |
Marine Sciences Glaciology |
description |
[1] 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. |
format |
Article in Journal/Newspaper |
author |
Nicholls, K.W. Østerhus, S. |
author_facet |
Nicholls, K.W. Østerhus, S. |
author_sort |
Nicholls, K.W. |
title |
Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
title_short |
Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
title_full |
Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
title_fullStr |
Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
title_full_unstemmed |
Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
title_sort |
interannual variability and ventilation timescales in the ocean cavity beneath filchner-ronne ice shelf, antarctica |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12319/ http://www.agu.org/journals/jc/jc0404/2003JC002149/index.html |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-48.117,-48.117,-79.333,-79.333) |
geographic |
Weddell Sea Austral Weddell Ronne Ice Shelf Berkner Island |
geographic_facet |
Weddell Sea Austral Weddell Ronne Ice Shelf Berkner Island |
genre |
Antarc* Antarctica Antarctica Journal Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctica Antarctica Journal Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
op_relation |
Nicholls, K.W. orcid:0000-0002-2188-4509 Østerhus, S. 2004 Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica. Journal of Geophysical Research, 109 (C4), C04014. 9, pp. https://doi.org/10.1029/2003JC002149 <https://doi.org/10.1029/2003JC002149> |
op_doi |
https://doi.org/10.1029/2003JC002149 |
container_title |
Journal of Geophysical Research |
container_volume |
109 |
container_issue |
C4 |
_version_ |
1766215028993687552 |