Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4
An increasing number of Southern Ocean models now include Antarctic ice-shelf cavities, and simulate thermodynamics at the ice-shelf/ocean interface. This adds another level of complexity to Southern Ocean simulations, as ice shelves interact directly with the ocean and indirectly with sea ice. Here...
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Online Access: | https://doi.org/10.5194/gmd-11-1257-2018 https://doaj.org/article/a64ae4d3b08c4a9bace2a1a2ba87d948 |
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ftdoajarticles:oai:doaj.org/article:a64ae4d3b08c4a9bace2a1a2ba87d948 2023-05-15T13:38:39+02:00 Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 K. A. Naughten K. J. Meissner B. K. Galton-Fenzi M. H. England R. Timmermann H. H. Hellmer T. Hattermann J. B. Debernard 2018-04-01T00:00:00Z https://doi.org/10.5194/gmd-11-1257-2018 https://doaj.org/article/a64ae4d3b08c4a9bace2a1a2ba87d948 EN eng Copernicus Publications https://www.geosci-model-dev.net/11/1257/2018/gmd-11-1257-2018.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-11-1257-2018 1991-959X 1991-9603 https://doaj.org/article/a64ae4d3b08c4a9bace2a1a2ba87d948 Geoscientific Model Development, Vol 11, Pp 1257-1292 (2018) Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/gmd-11-1257-2018 2022-12-31T16:25:06Z An increasing number of Southern Ocean models now include Antarctic ice-shelf cavities, and simulate thermodynamics at the ice-shelf/ocean interface. This adds another level of complexity to Southern Ocean simulations, as ice shelves interact directly with the ocean and indirectly with sea ice. Here, we present the first model intercomparison and evaluation of present-day ocean/sea-ice/ice-shelf interactions, as simulated by two models: a circumpolar Antarctic configuration of MetROMS (ROMS: Regional Ocean Modelling System coupled to CICE: Community Ice CodE) and the global model FESOM (Finite Element Sea-ice Ocean Model), where the latter is run at two different levels of horizontal resolution. From a circumpolar Antarctic perspective, we compare and evaluate simulated ice-shelf basal melting and sub-ice-shelf circulation, as well as sea-ice properties and Southern Ocean water mass characteristics as they influence the sub-ice-shelf processes. Despite their differing numerical methods, the two models produce broadly similar results and share similar biases in many cases. Both models reproduce many key features of observations but struggle to reproduce others, such as the high melt rates observed in the small warm-cavity ice shelves of the Amundsen and Bellingshausen seas. Several differences in model design show a particular influence on the simulations. For example, FESOM's greater topographic smoothing can alter the geometry of some ice-shelf cavities enough to affect their melt rates; this improves at higher resolution, since less smoothing is required. In the interior Southern Ocean, the vertical coordinate system affects the degree of water mass erosion due to spurious diapycnal mixing, with MetROMS' terrain-following coordinate leading to more erosion than FESOM's z coordinate. Finally, increased horizontal resolution in FESOM leads to higher basal melt rates for small ice shelves, through a combination of stronger circulation and small-scale intrusions of warm water from offshore. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Geoscientific Model Development 11 4 1257 1292 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 K. A. Naughten K. J. Meissner B. K. Galton-Fenzi M. H. England R. Timmermann H. H. Hellmer T. Hattermann J. B. Debernard Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
topic_facet |
Geology QE1-996.5 |
description |
An increasing number of Southern Ocean models now include Antarctic ice-shelf cavities, and simulate thermodynamics at the ice-shelf/ocean interface. This adds another level of complexity to Southern Ocean simulations, as ice shelves interact directly with the ocean and indirectly with sea ice. Here, we present the first model intercomparison and evaluation of present-day ocean/sea-ice/ice-shelf interactions, as simulated by two models: a circumpolar Antarctic configuration of MetROMS (ROMS: Regional Ocean Modelling System coupled to CICE: Community Ice CodE) and the global model FESOM (Finite Element Sea-ice Ocean Model), where the latter is run at two different levels of horizontal resolution. From a circumpolar Antarctic perspective, we compare and evaluate simulated ice-shelf basal melting and sub-ice-shelf circulation, as well as sea-ice properties and Southern Ocean water mass characteristics as they influence the sub-ice-shelf processes. Despite their differing numerical methods, the two models produce broadly similar results and share similar biases in many cases. Both models reproduce many key features of observations but struggle to reproduce others, such as the high melt rates observed in the small warm-cavity ice shelves of the Amundsen and Bellingshausen seas. Several differences in model design show a particular influence on the simulations. For example, FESOM's greater topographic smoothing can alter the geometry of some ice-shelf cavities enough to affect their melt rates; this improves at higher resolution, since less smoothing is required. In the interior Southern Ocean, the vertical coordinate system affects the degree of water mass erosion due to spurious diapycnal mixing, with MetROMS' terrain-following coordinate leading to more erosion than FESOM's z coordinate. Finally, increased horizontal resolution in FESOM leads to higher basal melt rates for small ice shelves, through a combination of stronger circulation and small-scale intrusions of warm water from offshore. |
format |
Article in Journal/Newspaper |
author |
K. A. Naughten K. J. Meissner B. K. Galton-Fenzi M. H. England R. Timmermann H. H. Hellmer T. Hattermann J. B. Debernard |
author_facet |
K. A. Naughten K. J. Meissner B. K. Galton-Fenzi M. H. England R. Timmermann H. H. Hellmer T. Hattermann J. B. Debernard |
author_sort |
K. A. Naughten |
title |
Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
title_short |
Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
title_full |
Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
title_fullStr |
Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
title_full_unstemmed |
Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4 |
title_sort |
intercomparison of antarctic ice-shelf, ocean, and sea-ice interactions simulated by metroms-iceshelf and fesom 1.4 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-11-1257-2018 https://doaj.org/article/a64ae4d3b08c4a9bace2a1a2ba87d948 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean |
op_source |
Geoscientific Model Development, Vol 11, Pp 1257-1292 (2018) |
op_relation |
https://www.geosci-model-dev.net/11/1257/2018/gmd-11-1257-2018.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-11-1257-2018 1991-959X 1991-9603 https://doaj.org/article/a64ae4d3b08c4a9bace2a1a2ba87d948 |
op_doi |
https://doi.org/10.5194/gmd-11-1257-2018 |
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Geoscientific Model Development |
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11 |
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4 |
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1257 |
op_container_end_page |
1292 |
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1766109154051620864 |