Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation
A recent ocean modelling study indicates that possible changes in circulation may bring warm deep-ocean water into direct contact with the grounding lines of the Filchner–Ronne ice streams, suggesting the potential for future ice losses from this sector equivalent to ~0.3 m of sea-level rise. Signif...
Published in: | The Cryosphere |
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Online Access: | https://doi.org/10.5194/tc-8-2119-2014 https://tc.copernicus.org/articles/8/2119/2014/ |
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ftcopernicus:oai:publications.copernicus.org:tc21236 2023-05-15T16:08:52+02:00 Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation Wright, A. P. Le Brocq, A. M. Cornford, S. L. Bingham, R. G. Corr, H. F. J. Ferraccioli, F. Jordan, T. A. Payne, A. J. Rippin, D. M. Ross, N. Siegert, M. J. 2018-09-27 application/pdf https://doi.org/10.5194/tc-8-2119-2014 https://tc.copernicus.org/articles/8/2119/2014/ eng eng doi:10.5194/tc-8-2119-2014 https://tc.copernicus.org/articles/8/2119/2014/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-8-2119-2014 2020-07-20T16:24:51Z A recent ocean modelling study indicates that possible changes in circulation may bring warm deep-ocean water into direct contact with the grounding lines of the Filchner–Ronne ice streams, suggesting the potential for future ice losses from this sector equivalent to ~0.3 m of sea-level rise. Significant advancements have been made in our knowledge of both the basal topography and ice velocity in the Weddell Sea sector, and the ability to accurately model marine ice sheet dynamics, thus enabling an assessment to be made of the relative sensitivities of the diverse collection of ice streams feeding the Filchner–Ronne Ice Shelf. Here we use the BISICLES ice sheet model, which employs adaptive-mesh refinement to resolve grounding line dynamics, to carry out such an assessment. The impact of realistic perturbations to the surface and sub-shelf mass balance forcing fields from our 2000-year "reference" model run indicate that both the Institute and Möller ice streams are highly sensitive to changes in basal melting either near to their respective grounding lines, or in the region of the ice rises within the Filchner–Ronne Ice Shelf. These same perturbations have little impact, however, on the Rutford, Carlson or Foundation ice streams, while the Evans Ice Stream is found to enter a phase of unstable retreat only after melt at its grounding line has increased by 50% of likely present-day values. Text Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea Copernicus Publications: E-Journals Evans Ice Stream ENVELOPE(-78.000,-78.000,-76.000,-76.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Weddell Weddell Sea The Cryosphere 8 6 2119 2134 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
A recent ocean modelling study indicates that possible changes in circulation may bring warm deep-ocean water into direct contact with the grounding lines of the Filchner–Ronne ice streams, suggesting the potential for future ice losses from this sector equivalent to ~0.3 m of sea-level rise. Significant advancements have been made in our knowledge of both the basal topography and ice velocity in the Weddell Sea sector, and the ability to accurately model marine ice sheet dynamics, thus enabling an assessment to be made of the relative sensitivities of the diverse collection of ice streams feeding the Filchner–Ronne Ice Shelf. Here we use the BISICLES ice sheet model, which employs adaptive-mesh refinement to resolve grounding line dynamics, to carry out such an assessment. The impact of realistic perturbations to the surface and sub-shelf mass balance forcing fields from our 2000-year "reference" model run indicate that both the Institute and Möller ice streams are highly sensitive to changes in basal melting either near to their respective grounding lines, or in the region of the ice rises within the Filchner–Ronne Ice Shelf. These same perturbations have little impact, however, on the Rutford, Carlson or Foundation ice streams, while the Evans Ice Stream is found to enter a phase of unstable retreat only after melt at its grounding line has increased by 50% of likely present-day values. |
format |
Text |
author |
Wright, A. P. Le Brocq, A. M. Cornford, S. L. Bingham, R. G. Corr, H. F. J. Ferraccioli, F. Jordan, T. A. Payne, A. J. Rippin, D. M. Ross, N. Siegert, M. J. |
spellingShingle |
Wright, A. P. Le Brocq, A. M. Cornford, S. L. Bingham, R. G. Corr, H. F. J. Ferraccioli, F. Jordan, T. A. Payne, A. J. Rippin, D. M. Ross, N. Siegert, M. J. Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
author_facet |
Wright, A. P. Le Brocq, A. M. Cornford, S. L. Bingham, R. G. Corr, H. F. J. Ferraccioli, F. Jordan, T. A. Payne, A. J. Rippin, D. M. Ross, N. Siegert, M. J. |
author_sort |
Wright, A. P. |
title |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
title_short |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
title_full |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
title_fullStr |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
title_full_unstemmed |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
title_sort |
sensitivity of the weddell sea sector ice streams to sub-shelf melting and surface accumulation |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-8-2119-2014 https://tc.copernicus.org/articles/8/2119/2014/ |
long_lat |
ENVELOPE(-78.000,-78.000,-76.000,-76.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-85.300,-85.300,-78.600,-78.600) |
geographic |
Evans Ice Stream Ronne Ice Shelf Rutford Weddell Weddell Sea |
geographic_facet |
Evans Ice Stream Ronne Ice Shelf Rutford Weddell Weddell Sea |
genre |
Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Evans Ice Stream Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-8-2119-2014 https://tc.copernicus.org/articles/8/2119/2014/ |
op_doi |
https://doi.org/10.5194/tc-8-2119-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
6 |
container_start_page |
2119 |
op_container_end_page |
2134 |
_version_ |
1766404898142814208 |