An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula
In recent decades, rapid ice shelf disintegration along the Antarctic Peninsula has had a global impact through enhancing outlet glacier flow and hence sea level rise and the freshening of Antarctic Bottom Water. Ice shelf thinning due to basal melting results from the circulation of relatively warm...
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Copernicus Publications
2020
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Online Access: | https://doi.org/10.5194/essd-12-887-2020 https://www.earth-syst-sci-data.net/12/887/2020/essd-12-887-2020.pdf https://doaj.org/article/99478d3ed4a74dce93be9c3a41615088 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:99478d3ed4a74dce93be9c3a41615088 2023-05-15T13:57:25+02:00 An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula A. Brisbourne B. Kulessa T. Hudson L. Harrison P. Holland A. Luckman S. Bevan D. Ashmore B. Hubbard E. Pearce J. White A. Booth K. Nicholls A. Smith 2020-04-01 https://doi.org/10.5194/essd-12-887-2020 https://www.earth-syst-sci-data.net/12/887/2020/essd-12-887-2020.pdf https://doaj.org/article/99478d3ed4a74dce93be9c3a41615088 en eng Copernicus Publications doi:10.5194/essd-12-887-2020 1866-3508 1866-3516 https://www.earth-syst-sci-data.net/12/887/2020/essd-12-887-2020.pdf https://doaj.org/article/99478d3ed4a74dce93be9c3a41615088 undefined Earth System Science Data, Vol 12, Pp 887-896 (2020) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.5194/essd-12-887-2020 2023-01-22T18:35:32Z In recent decades, rapid ice shelf disintegration along the Antarctic Peninsula has had a global impact through enhancing outlet glacier flow and hence sea level rise and the freshening of Antarctic Bottom Water. Ice shelf thinning due to basal melting results from the circulation of relatively warm water in the underlying ocean cavity. However, the effect of sub-shelf circulation on future ice shelf stability cannot be predicted accurately with computer simulations if the geometry of the ice shelf cavity is unknown. To address this deficit for Larsen C Ice Shelf, West Antarctica, we integrate new water column thickness measurements from recent seismic campaigns with existing observations. We present these new data here along with an updated bathymetry grid of the ocean cavity. Key findings include a relatively deep seabed to the southeast of the Kenyon Peninsula, along the grounding line and around the key ice shelf pinning-point of Bawden Ice Rise. In addition, we can confirm that the cavity's southern trough stretches from Mobiloil Inlet to the open ocean. These areas of deep seabed will influence ocean circulation and tidal mixing and will therefore affect the basal-melt distribution. These results will help constrain models of ice shelf cavity circulation with the aim of improving our understanding of sub-shelf processes and their potential influence on ice shelf stability. The datasets are comprised of all the new point measurements of seabed depth. We present the new depth measurements here, as well as a compilation of previously published measurements. To demonstrate the improvements to the sub-shelf bathymetry map that these new data provide we include a gridded data product in the Supplement of this paper, derived using the additional measurements of both offshore seabed depth and the thickness of grounded ice. The underlying seismic datasets that were used to determine bed depth and ice thickness are available at https://doi.org/10.5285/315740B1-A7B9-4CF0-9521-86F046E33E9A (Brisbourne et al., 2019), ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf West Antarctica Unknown Antarctic Antarctic Peninsula Bawden Ice Rise ENVELOPE(-60.155,-60.155,-66.858,-66.858) Kenyon ENVELOPE(-174.867,-174.867,-85.167,-85.167) Kenyon peninsula ENVELOPE(-63.550,-63.550,-68.450,-68.450) Mobiloil ENVELOPE(-64.500,-64.500,-68.583,-68.583) Mobiloil Inlet ENVELOPE(-65.000,-65.000,-68.500,-68.500) The Antarctic West Antarctica Earth System Science Data 12 2 887 896 |
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English |
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geo envir |
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geo envir A. Brisbourne B. Kulessa T. Hudson L. Harrison P. Holland A. Luckman S. Bevan D. Ashmore B. Hubbard E. Pearce J. White A. Booth K. Nicholls A. Smith An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
topic_facet |
geo envir |
description |
In recent decades, rapid ice shelf disintegration along the Antarctic Peninsula has had a global impact through enhancing outlet glacier flow and hence sea level rise and the freshening of Antarctic Bottom Water. Ice shelf thinning due to basal melting results from the circulation of relatively warm water in the underlying ocean cavity. However, the effect of sub-shelf circulation on future ice shelf stability cannot be predicted accurately with computer simulations if the geometry of the ice shelf cavity is unknown. To address this deficit for Larsen C Ice Shelf, West Antarctica, we integrate new water column thickness measurements from recent seismic campaigns with existing observations. We present these new data here along with an updated bathymetry grid of the ocean cavity. Key findings include a relatively deep seabed to the southeast of the Kenyon Peninsula, along the grounding line and around the key ice shelf pinning-point of Bawden Ice Rise. In addition, we can confirm that the cavity's southern trough stretches from Mobiloil Inlet to the open ocean. These areas of deep seabed will influence ocean circulation and tidal mixing and will therefore affect the basal-melt distribution. These results will help constrain models of ice shelf cavity circulation with the aim of improving our understanding of sub-shelf processes and their potential influence on ice shelf stability. The datasets are comprised of all the new point measurements of seabed depth. We present the new depth measurements here, as well as a compilation of previously published measurements. To demonstrate the improvements to the sub-shelf bathymetry map that these new data provide we include a gridded data product in the Supplement of this paper, derived using the additional measurements of both offshore seabed depth and the thickness of grounded ice. The underlying seismic datasets that were used to determine bed depth and ice thickness are available at https://doi.org/10.5285/315740B1-A7B9-4CF0-9521-86F046E33E9A (Brisbourne et al., 2019), ... |
format |
Article in Journal/Newspaper |
author |
A. Brisbourne B. Kulessa T. Hudson L. Harrison P. Holland A. Luckman S. Bevan D. Ashmore B. Hubbard E. Pearce J. White A. Booth K. Nicholls A. Smith |
author_facet |
A. Brisbourne B. Kulessa T. Hudson L. Harrison P. Holland A. Luckman S. Bevan D. Ashmore B. Hubbard E. Pearce J. White A. Booth K. Nicholls A. Smith |
author_sort |
A. Brisbourne |
title |
An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
title_short |
An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
title_full |
An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
title_fullStr |
An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
title_full_unstemmed |
An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula |
title_sort |
updated seabed bathymetry beneath larsen c ice shelf, antarctic peninsula |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/essd-12-887-2020 https://www.earth-syst-sci-data.net/12/887/2020/essd-12-887-2020.pdf https://doaj.org/article/99478d3ed4a74dce93be9c3a41615088 |
long_lat |
ENVELOPE(-60.155,-60.155,-66.858,-66.858) ENVELOPE(-174.867,-174.867,-85.167,-85.167) ENVELOPE(-63.550,-63.550,-68.450,-68.450) ENVELOPE(-64.500,-64.500,-68.583,-68.583) ENVELOPE(-65.000,-65.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Bawden Ice Rise Kenyon Kenyon peninsula Mobiloil Mobiloil Inlet The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Bawden Ice Rise Kenyon Kenyon peninsula Mobiloil Mobiloil Inlet The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf West Antarctica |
op_source |
Earth System Science Data, Vol 12, Pp 887-896 (2020) |
op_relation |
doi:10.5194/essd-12-887-2020 1866-3508 1866-3516 https://www.earth-syst-sci-data.net/12/887/2020/essd-12-887-2020.pdf https://doaj.org/article/99478d3ed4a74dce93be9c3a41615088 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/essd-12-887-2020 |
container_title |
Earth System Science Data |
container_volume |
12 |
container_issue |
2 |
container_start_page |
887 |
op_container_end_page |
896 |
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