Water masses distribution offshore the Sabrina Coast (East Antarctica)
Current glacier melt rates in West Antarctica substantially exceed those around the East Antarctic margin. The exception is Wilkes Land, where for example Totten Glacier underwent significant retreat between 2000 and 2012, underlining its sensitivity to climate change. This process is strongly influ...
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Copernicus Publications
2022
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fttriple:oai:gotriple.eu:oai:doaj.org/article:277781524fe9429c8d95a581998fcd06 2023-05-15T14:04:32+02:00 Water masses distribution offshore the Sabrina Coast (East Antarctica) M. Bensi V. Kovačević F. Donda P. E. O'Brien L. Armbrecht L. K. Armand 2022-01-01 https://doi.org/10.5194/essd-14-65-2022 https://essd.copernicus.org/articles/14/65/2022/essd-14-65-2022.pdf https://doaj.org/article/277781524fe9429c8d95a581998fcd06 en eng Copernicus Publications doi:10.5194/essd-14-65-2022 1866-3508 1866-3516 https://essd.copernicus.org/articles/14/65/2022/essd-14-65-2022.pdf https://doaj.org/article/277781524fe9429c8d95a581998fcd06 undefined Earth System Science Data, Vol 14, Pp 65-78 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/essd-14-65-2022 2023-01-22T19:00:14Z Current glacier melt rates in West Antarctica substantially exceed those around the East Antarctic margin. The exception is Wilkes Land, where for example Totten Glacier underwent significant retreat between 2000 and 2012, underlining its sensitivity to climate change. This process is strongly influenced by ocean dynamics, which in turn changes in accordance with the evolution of the ice caps. Here, we present new oceanographic data (temperature, salinity, and dissolved oxygen) collected during austral summer 2017 offshore the Sabrina Coast (East Antarctica) from the continental shelf break to ca 3000 m depth. This area is characterized by very few oceanographic in situ observations. The main water masses of the study area, identified by analysing thermohaline properties, are the Antarctic Surface Water with potential temperature θ>-1.5 ∘C and salinity S<34.2 (σθ<27.55 kg m−3), the Winter Water with -1.92<θ<-1.75 ∘C and 34.0<S<34.5 (potential density, 27.55<σθ<27.7 kg m−3), the modified Circumpolar Deep Water with θ>0 ∘C and S>34.5 (σθ>27.7 kg m−3), and Antarctic Bottom Water with -0.50<θ<0 ∘C and 34.6328.30 kg m−3). The latter is a mixture of dense waters from the Ross Sea and Adélie Land continental shelves. Such waters are influenced by the mixing processes they undergo as they move westward along the Antarctic margin, also interacting with the warmer Circumpolar Deep Water. The spatial distribution of water masses offshore the Sabrina Coast also appears to be strongly linked with the complex morpho-bathymetry of the slope and rise area, supporting the hypothesis that downslope processes contribute to shaping the architecture of the distal portion of the continental margin. Oceanographic data presented here can be downloaded from https://doi.org/10.25919/yyex-t381 (CSIRO; Van Graas, 2021). Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ross Sea Totten Glacier West Antarctica Wilkes Land Unknown Antarctic Austral East Antarctica Ross Sea Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) The Antarctic Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) West Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Earth System Science Data 14 1 65 78 |
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English |
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geo envir |
spellingShingle |
geo envir M. Bensi V. Kovačević F. Donda P. E. O'Brien L. Armbrecht L. K. Armand Water masses distribution offshore the Sabrina Coast (East Antarctica) |
topic_facet |
geo envir |
description |
Current glacier melt rates in West Antarctica substantially exceed those around the East Antarctic margin. The exception is Wilkes Land, where for example Totten Glacier underwent significant retreat between 2000 and 2012, underlining its sensitivity to climate change. This process is strongly influenced by ocean dynamics, which in turn changes in accordance with the evolution of the ice caps. Here, we present new oceanographic data (temperature, salinity, and dissolved oxygen) collected during austral summer 2017 offshore the Sabrina Coast (East Antarctica) from the continental shelf break to ca 3000 m depth. This area is characterized by very few oceanographic in situ observations. The main water masses of the study area, identified by analysing thermohaline properties, are the Antarctic Surface Water with potential temperature θ>-1.5 ∘C and salinity S<34.2 (σθ<27.55 kg m−3), the Winter Water with -1.92<θ<-1.75 ∘C and 34.0<S<34.5 (potential density, 27.55<σθ<27.7 kg m−3), the modified Circumpolar Deep Water with θ>0 ∘C and S>34.5 (σθ>27.7 kg m−3), and Antarctic Bottom Water with -0.50<θ<0 ∘C and 34.6328.30 kg m−3). The latter is a mixture of dense waters from the Ross Sea and Adélie Land continental shelves. Such waters are influenced by the mixing processes they undergo as they move westward along the Antarctic margin, also interacting with the warmer Circumpolar Deep Water. The spatial distribution of water masses offshore the Sabrina Coast also appears to be strongly linked with the complex morpho-bathymetry of the slope and rise area, supporting the hypothesis that downslope processes contribute to shaping the architecture of the distal portion of the continental margin. Oceanographic data presented here can be downloaded from https://doi.org/10.25919/yyex-t381 (CSIRO; Van Graas, 2021). |
format |
Article in Journal/Newspaper |
author |
M. Bensi V. Kovačević F. Donda P. E. O'Brien L. Armbrecht L. K. Armand |
author_facet |
M. Bensi V. Kovačević F. Donda P. E. O'Brien L. Armbrecht L. K. Armand |
author_sort |
M. Bensi |
title |
Water masses distribution offshore the Sabrina Coast (East Antarctica) |
title_short |
Water masses distribution offshore the Sabrina Coast (East Antarctica) |
title_full |
Water masses distribution offshore the Sabrina Coast (East Antarctica) |
title_fullStr |
Water masses distribution offshore the Sabrina Coast (East Antarctica) |
title_full_unstemmed |
Water masses distribution offshore the Sabrina Coast (East Antarctica) |
title_sort |
water masses distribution offshore the sabrina coast (east antarctica) |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/essd-14-65-2022 https://essd.copernicus.org/articles/14/65/2022/essd-14-65-2022.pdf https://doaj.org/article/277781524fe9429c8d95a581998fcd06 |
long_lat |
ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Austral East Antarctica Ross Sea Sabrina Coast The Antarctic Totten Glacier West Antarctica Wilkes Land |
geographic_facet |
Antarctic Austral East Antarctica Ross Sea Sabrina Coast The Antarctic Totten Glacier West Antarctica Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea Totten Glacier West Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea Totten Glacier West Antarctica Wilkes Land |
op_source |
Earth System Science Data, Vol 14, Pp 65-78 (2022) |
op_relation |
doi:10.5194/essd-14-65-2022 1866-3508 1866-3516 https://essd.copernicus.org/articles/14/65/2022/essd-14-65-2022.pdf https://doaj.org/article/277781524fe9429c8d95a581998fcd06 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/essd-14-65-2022 |
container_title |
Earth System Science Data |
container_volume |
14 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
78 |
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1766275702132310016 |