Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica
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 ligh...
Published in: | Journal of Geophysical Research |
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Language: | English |
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American Geophysical Union
2004
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Online Access: | https://hdl.handle.net/1956/372 https://doi.org/10.1029/2003jc002149 |
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ftunivbergen:oai:bora.uib.no:1956/372 2023-05-15T13:50:39+02:00 Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica Nicholls, Keith W. Østerhus, Svein 2004-04-20 38782 bytes 137 bytes 1151035 bytes text/plain application/pdf https://hdl.handle.net/1956/372 https://doi.org/10.1029/2003jc002149 eng eng American Geophysical Union urn:issn:0148-0227 https://hdl.handle.net/1956/372 https://doi.org/10.1029/2003jc002149 cristin:420748 Copyright 2004 the American Geophysical Union C04014 Journal of Geophysical Research 109 Peer reviewed Journal article 2004 ftunivbergen https://doi.org/10.1029/2003jc002149 2023-03-14T17:39:27Z 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. publishedVersion Article in Journal/Newspaper Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Austral Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Weddell Weddell Sea Journal of Geophysical Research 109 C4 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Nicholls, Keith W. Østerhus, Svein |
spellingShingle |
Nicholls, Keith W. Østerhus, Svein Interannual variability and ventilation timescales in the ocean cavity beneath Filchner-Ronne Ice Shelf, Antarctica |
author_facet |
Nicholls, Keith W. Østerhus, Svein |
author_sort |
Nicholls, Keith 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 |
https://hdl.handle.net/1956/372 https://doi.org/10.1029/2003jc002149 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Austral Berkner Island Ronne Ice Shelf Weddell Weddell Sea |
geographic_facet |
Austral Berkner Island Ronne Ice Shelf Weddell Weddell Sea |
genre |
Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctica Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
op_source |
C04014 Journal of Geophysical Research 109 |
op_relation |
urn:issn:0148-0227 https://hdl.handle.net/1956/372 https://doi.org/10.1029/2003jc002149 cristin:420748 |
op_rights |
Copyright 2004 the American Geophysical Union |
op_doi |
https://doi.org/10.1029/2003jc002149 |
container_title |
Journal of Geophysical Research |
container_volume |
109 |
container_issue |
C4 |
_version_ |
1766253815807344640 |