Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation
[1] Marine ice is an important factor in ice shelf stability. An extensive marine ice layer is present under the Amery Ice Shelf (AIS), East Antarctica. This paper documents observations on the seasonal variability of the AIS-ocean interaction beneath the marine ice layer. We focus on data collected...
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ftunivtasecite:oai:ecite.utas.edu.au:100630 2023-05-15T13:22:03+02:00 Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation Herraiz Borreguero, L Allison, I Craven, M Nicholls, KW Rosenberg, MA 2013 application/pdf https://doi.org/10.1002/2013JC009158 http://ecite.utas.edu.au/100630 en eng Wiley-Blackwell Publishing, Inc. http://ecite.utas.edu.au/100630/2/100630 final.pdf http://dx.doi.org/10.1002/2013JC009158 Herraiz Borreguero, L and Allison, I and Craven, M and Nicholls, KW and Rosenberg, MA, Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation, Journal of Geophysical Research: Oceans, 118, (12) pp. 7117-7131. ISSN 2169-9275 (2013) [Refereed Article] http://ecite.utas.edu.au/100630 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.1002/2013JC009158 2019-12-13T22:02:28Z [1] Marine ice is an important factor in ice shelf stability. An extensive marine ice layer is present under the Amery Ice Shelf (AIS), East Antarctica. This paper documents observations on the seasonal variability of the AIS-ocean interaction beneath the marine ice layer. We focus on data collected during 2002 through a borehole at AM01, 100 km from the ice shelf calving front, and use additional data from two other boreholes to complement the study. At AM01, the top ∼20 m of the water column is super-cooled almost year round, protecting the marine ice layer and promoting frazil ice formation. The mixed layer thickness varies from ∼50 m in February to at least 160 m by June, as the water column cools and freshens. High Salinity Shelf Water (HSSW) abruptly arrives at AM01 in JuneAugust as an eddy-like flow. We suggest that the flow characteristics are a result of baroclinic instabilities. In addition, the inflow of HSSW results in a steepening of the isopycnals that enhances the upwelling of Ice Shelf Water. This study documents, for the first time, a seasonal signal in the formation of marine ice under the AIS. Our results highlight the vulnerability of the marine ice layer to ocean variability with potential consequences for the overall ice shelf mass balance. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf eCite UTAS (University of Tasmania) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) East Antarctica Journal of Geophysical Research: Oceans 118 12 7117 7131 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Herraiz Borreguero, L Allison, I Craven, M Nicholls, KW Rosenberg, MA Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
[1] Marine ice is an important factor in ice shelf stability. An extensive marine ice layer is present under the Amery Ice Shelf (AIS), East Antarctica. This paper documents observations on the seasonal variability of the AIS-ocean interaction beneath the marine ice layer. We focus on data collected during 2002 through a borehole at AM01, 100 km from the ice shelf calving front, and use additional data from two other boreholes to complement the study. At AM01, the top ∼20 m of the water column is super-cooled almost year round, protecting the marine ice layer and promoting frazil ice formation. The mixed layer thickness varies from ∼50 m in February to at least 160 m by June, as the water column cools and freshens. High Salinity Shelf Water (HSSW) abruptly arrives at AM01 in JuneAugust as an eddy-like flow. We suggest that the flow characteristics are a result of baroclinic instabilities. In addition, the inflow of HSSW results in a steepening of the isopycnals that enhances the upwelling of Ice Shelf Water. This study documents, for the first time, a seasonal signal in the formation of marine ice under the AIS. Our results highlight the vulnerability of the marine ice layer to ocean variability with potential consequences for the overall ice shelf mass balance. |
format |
Article in Journal/Newspaper |
author |
Herraiz Borreguero, L Allison, I Craven, M Nicholls, KW Rosenberg, MA |
author_facet |
Herraiz Borreguero, L Allison, I Craven, M Nicholls, KW Rosenberg, MA |
author_sort |
Herraiz Borreguero, L |
title |
Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
title_short |
Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
title_full |
Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
title_fullStr |
Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
title_full_unstemmed |
Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation |
title_sort |
ice shelf/ocean interactions under the amery ice shelf: seasonal variability and its effect on marine ice formation |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2013 |
url |
https://doi.org/10.1002/2013JC009158 http://ecite.utas.edu.au/100630 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf East Antarctica |
geographic_facet |
Amery Amery Ice Shelf East Antarctica |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
op_relation |
http://ecite.utas.edu.au/100630/2/100630 final.pdf http://dx.doi.org/10.1002/2013JC009158 Herraiz Borreguero, L and Allison, I and Craven, M and Nicholls, KW and Rosenberg, MA, Ice shelf/ocean interactions under the Amery Ice Shelf: seasonal variability and its effect on marine ice formation, Journal of Geophysical Research: Oceans, 118, (12) pp. 7117-7131. ISSN 2169-9275 (2013) [Refereed Article] http://ecite.utas.edu.au/100630 |
op_doi |
https://doi.org/10.1002/2013JC009158 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
12 |
container_start_page |
7117 |
op_container_end_page |
7131 |
_version_ |
1766363042020327424 |