Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6
Ice-shelf-ocean interactions are a major source of freshwater on the Antarctic continental shelf and have a strong impact on ocean properties, ocean circulation and sea ice. However, climate models based on the ocean-sea ice model NEMO (Nucleus for European Modelling of the Ocean) currently do not i...
Published in: | Geoscientific Model Development |
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European Geosciences Union
2017
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/42522/ https://doi.org/10.5194/gmd-10-2849-2017 https://nrl.northumbria.ac.uk/id/eprint/42522/1/Explicit%20representation%20and%20parametrised%20impacts%20of%20under%20ice%20shelf%20seas%20in%20the%20z%E2%88%97-%20coordinate%20ocean%20model%20NEMO%203.6.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:42522 2023-05-15T13:44:52+02:00 Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 Mathiot, Pierre Jenkins, Adrian Harris, Christopher Madec, Gurvan 2017-07-26 text https://nrl.northumbria.ac.uk/id/eprint/42522/ https://doi.org/10.5194/gmd-10-2849-2017 https://nrl.northumbria.ac.uk/id/eprint/42522/1/Explicit%20representation%20and%20parametrised%20impacts%20of%20under%20ice%20shelf%20seas%20in%20the%20z%E2%88%97-%20coordinate%20ocean%20model%20NEMO%203.6.pdf en eng European Geosciences Union https://nrl.northumbria.ac.uk/id/eprint/42522/1/Explicit%20representation%20and%20parametrised%20impacts%20of%20under%20ice%20shelf%20seas%20in%20the%20z%E2%88%97-%20coordinate%20ocean%20model%20NEMO%203.6.pdf Mathiot, Pierre, Jenkins, Adrian, Harris, Christopher and Madec, Gurvan (2017) Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6. Geoscientific Model Development, 10 (7). pp. 2849-2874. ISSN 1991-9603 cc_by CC-BY F700 Ocean Sciences Article PeerReviewed 2017 ftunivnorthumb https://doi.org/10.5194/gmd-10-2849-2017 2022-09-25T06:11:41Z Ice-shelf-ocean interactions are a major source of freshwater on the Antarctic continental shelf and have a strong impact on ocean properties, ocean circulation and sea ice. However, climate models based on the ocean-sea ice model NEMO (Nucleus for European Modelling of the Ocean) currently do not include these interactions in any detail. The capability of explicitly simulating the circulation beneath ice shelves is introduced in the non-linear free surface model NEMO. Its implementation into the NEMO framework and its assessment in an idealised and realistic circum-Antarctic configuration is described in this study. Compared with the current prescription of ice shelf melting (i.e. at the surface), inclusion of open sub-ice-shelf cavities leads to a decrease in sea ice thickness along the coast, a weakening of the ocean stratification on the shelf, a decrease in salinity of high-salinity shelf water on the Ross and Weddell sea shelves and an increase in the strength of the gyres that circulate within the over-deepened basins on the West Antarctic continental shelf. Mimicking the overturning circulation under the ice shelves by introducing a prescribed meltwater flux over the depth range of the ice shelf base, rather than at the surface, is also assessed. It yields similar improvements in the simulated ocean properties and circulation over the Antarctic continental shelf to those from the explicit ice shelf cavity representation. With the ice shelf cavities opened, the widely used "three equation" ice shelf melting formulation, which enables an interactive computation of melting, is tested. Comparison with observational estimates of ice shelf melting indicates realistic results for most ice shelves. However, melting rates for the Amery, Getz and George VI ice shelves are considerably overestimated. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Weddell Sea Northumbria University, Newcastle: Northumbria Research Link (NRL) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Antarctic Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) The Antarctic Weddell Weddell Sea Geoscientific Model Development 10 7 2849 2874 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F700 Ocean Sciences |
spellingShingle |
F700 Ocean Sciences Mathiot, Pierre Jenkins, Adrian Harris, Christopher Madec, Gurvan Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
topic_facet |
F700 Ocean Sciences |
description |
Ice-shelf-ocean interactions are a major source of freshwater on the Antarctic continental shelf and have a strong impact on ocean properties, ocean circulation and sea ice. However, climate models based on the ocean-sea ice model NEMO (Nucleus for European Modelling of the Ocean) currently do not include these interactions in any detail. The capability of explicitly simulating the circulation beneath ice shelves is introduced in the non-linear free surface model NEMO. Its implementation into the NEMO framework and its assessment in an idealised and realistic circum-Antarctic configuration is described in this study. Compared with the current prescription of ice shelf melting (i.e. at the surface), inclusion of open sub-ice-shelf cavities leads to a decrease in sea ice thickness along the coast, a weakening of the ocean stratification on the shelf, a decrease in salinity of high-salinity shelf water on the Ross and Weddell sea shelves and an increase in the strength of the gyres that circulate within the over-deepened basins on the West Antarctic continental shelf. Mimicking the overturning circulation under the ice shelves by introducing a prescribed meltwater flux over the depth range of the ice shelf base, rather than at the surface, is also assessed. It yields similar improvements in the simulated ocean properties and circulation over the Antarctic continental shelf to those from the explicit ice shelf cavity representation. With the ice shelf cavities opened, the widely used "three equation" ice shelf melting formulation, which enables an interactive computation of melting, is tested. Comparison with observational estimates of ice shelf melting indicates realistic results for most ice shelves. However, melting rates for the Amery, Getz and George VI ice shelves are considerably overestimated. |
format |
Article in Journal/Newspaper |
author |
Mathiot, Pierre Jenkins, Adrian Harris, Christopher Madec, Gurvan |
author_facet |
Mathiot, Pierre Jenkins, Adrian Harris, Christopher Madec, Gurvan |
author_sort |
Mathiot, Pierre |
title |
Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
title_short |
Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
title_full |
Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
title_fullStr |
Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
title_full_unstemmed |
Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6 |
title_sort |
explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model nemo 3.6 |
publisher |
European Geosciences Union |
publishDate |
2017 |
url |
https://nrl.northumbria.ac.uk/id/eprint/42522/ https://doi.org/10.5194/gmd-10-2849-2017 https://nrl.northumbria.ac.uk/id/eprint/42522/1/Explicit%20representation%20and%20parametrised%20impacts%20of%20under%20ice%20shelf%20seas%20in%20the%20z%E2%88%97-%20coordinate%20ocean%20model%20NEMO%203.6.pdf |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(-145.217,-145.217,-76.550,-76.550) |
geographic |
Amery Antarctic Getz The Antarctic Weddell Weddell Sea |
geographic_facet |
Amery Antarctic Getz The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Weddell Sea |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/42522/1/Explicit%20representation%20and%20parametrised%20impacts%20of%20under%20ice%20shelf%20seas%20in%20the%20z%E2%88%97-%20coordinate%20ocean%20model%20NEMO%203.6.pdf Mathiot, Pierre, Jenkins, Adrian, Harris, Christopher and Madec, Gurvan (2017) Explicit representation and parametrised impacts of under ice shelf seas in the z∗ coordinate ocean model NEMO 3.6. Geoscientific Model Development, 10 (7). pp. 2849-2874. ISSN 1991-9603 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/gmd-10-2849-2017 |
container_title |
Geoscientific Model Development |
container_volume |
10 |
container_issue |
7 |
container_start_page |
2849 |
op_container_end_page |
2874 |
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1766207778782707712 |