Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands
The sub-Antarctic is one of the most data-sparse regions on earth. A number of glaciated Antarctic and sub-Antarctic islands have the potential to provide unique ice core records of past climate, atmospheric circulation, and sea ice. However, very little is known about the glaciology of these remote...
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Copernicus Publications
2021
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fttriple:oai:gotriple.eu:oai:doaj.org/article:1fc00b9e72614d6f9122c986b5e40bfb 2023-05-15T13:53:58+02:00 Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands E. R. Thomas G. Gacitúa J. B. Pedro A. C. Faith King B. Markle M. Potocki D. E. Moser 2021-03-01 https://doi.org/10.5194/tc-15-1173-2021 https://tc.copernicus.org/articles/15/1173/2021/tc-15-1173-2021.pdf https://doaj.org/article/1fc00b9e72614d6f9122c986b5e40bfb en eng Copernicus Publications doi:10.5194/tc-15-1173-2021 1994-0416 1994-0424 https://tc.copernicus.org/articles/15/1173/2021/tc-15-1173-2021.pdf https://doaj.org/article/1fc00b9e72614d6f9122c986b5e40bfb undefined The Cryosphere, Vol 15, Pp 1173-1186 (2021) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/tc-15-1173-2021 2023-01-22T19:25:30Z The sub-Antarctic is one of the most data-sparse regions on earth. A number of glaciated Antarctic and sub-Antarctic islands have the potential to provide unique ice core records of past climate, atmospheric circulation, and sea ice. However, very little is known about the glaciology of these remote islands or their vulnerability to warming atmospheric temperature. Here we present melt histories and density profiles from shallow ice (firn) cores (14 to 24 m) drilled on three sub-Antarctic islands and two Antarctic coastal domes. Additionally, complementary ground-penetrating radar (GPR) data were collected to further characterize each site and assess the spatial distribution of the observed melt layers. This study includes the first ever firn cores from Bouvet Island (54∘25′19′′ S, 03∘23′27′′ E) in the South Atlantic, from Peter I Island (68∘51′05′′ S, 90∘30′35′′ W) in the Bellingshausen Sea, and from Young Island (66∘31′44′′ S, 162∘33′21′′ E) in the Ross Sea sector's Balleny island chain. Despite their sub-Antarctic location, surface melt is low at most sites (melt layers account for ∼ 10 % of total core), with undisturbed ice layers in the upper ∼ 40 m, suggesting minimal impact of meltwater percolation. The exception is Young Island, where melt layers account for 47 % of the firn core. Surface snow densities range from 0.47 to 0.52 kg m−3, with close-off depths ranging from 21 to 51 m. Based on the measured density, we estimate that the bottom ages of a 100 m ice core drilled on Peter 1 Island would reach ∼ 1856 CE and ∼ 1874 CE at Young Island. Article in Journal/Newspaper Antarc* Antarctic Bellingshausen Sea Bouvet Island ice core Peter I Island Ross Sea Sea ice The Cryosphere Young Island Unknown Antarctic Ross Sea Bellingshausen Sea Bouvet ENVELOPE(3.358,3.358,-54.422,-54.422) Bouvet Island ENVELOPE(3.358,3.358,-54.422,-54.422) Young Island ENVELOPE(162.400,162.400,-66.417,-66.417) Peter I Island ENVELOPE(-90.583,-90.583,-68.783,-68.783) The Cryosphere 15 2 1173 1186 |
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geo envir E. R. Thomas G. Gacitúa J. B. Pedro A. C. Faith King B. Markle M. Potocki D. E. Moser Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
topic_facet |
geo envir |
description |
The sub-Antarctic is one of the most data-sparse regions on earth. A number of glaciated Antarctic and sub-Antarctic islands have the potential to provide unique ice core records of past climate, atmospheric circulation, and sea ice. However, very little is known about the glaciology of these remote islands or their vulnerability to warming atmospheric temperature. Here we present melt histories and density profiles from shallow ice (firn) cores (14 to 24 m) drilled on three sub-Antarctic islands and two Antarctic coastal domes. Additionally, complementary ground-penetrating radar (GPR) data were collected to further characterize each site and assess the spatial distribution of the observed melt layers. This study includes the first ever firn cores from Bouvet Island (54∘25′19′′ S, 03∘23′27′′ E) in the South Atlantic, from Peter I Island (68∘51′05′′ S, 90∘30′35′′ W) in the Bellingshausen Sea, and from Young Island (66∘31′44′′ S, 162∘33′21′′ E) in the Ross Sea sector's Balleny island chain. Despite their sub-Antarctic location, surface melt is low at most sites (melt layers account for ∼ 10 % of total core), with undisturbed ice layers in the upper ∼ 40 m, suggesting minimal impact of meltwater percolation. The exception is Young Island, where melt layers account for 47 % of the firn core. Surface snow densities range from 0.47 to 0.52 kg m−3, with close-off depths ranging from 21 to 51 m. Based on the measured density, we estimate that the bottom ages of a 100 m ice core drilled on Peter 1 Island would reach ∼ 1856 CE and ∼ 1874 CE at Young Island. |
format |
Article in Journal/Newspaper |
author |
E. R. Thomas G. Gacitúa J. B. Pedro A. C. Faith King B. Markle M. Potocki D. E. Moser |
author_facet |
E. R. Thomas G. Gacitúa J. B. Pedro A. C. Faith King B. Markle M. Potocki D. E. Moser |
author_sort |
E. R. Thomas |
title |
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
title_short |
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
title_full |
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
title_fullStr |
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
title_full_unstemmed |
Physical properties of shallow ice cores from Antarctic and sub-Antarctic islands |
title_sort |
physical properties of shallow ice cores from antarctic and sub-antarctic islands |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-1173-2021 https://tc.copernicus.org/articles/15/1173/2021/tc-15-1173-2021.pdf https://doaj.org/article/1fc00b9e72614d6f9122c986b5e40bfb |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(162.400,162.400,-66.417,-66.417) ENVELOPE(-90.583,-90.583,-68.783,-68.783) |
geographic |
Antarctic Ross Sea Bellingshausen Sea Bouvet Bouvet Island Young Island Peter I Island |
geographic_facet |
Antarctic Ross Sea Bellingshausen Sea Bouvet Bouvet Island Young Island Peter I Island |
genre |
Antarc* Antarctic Bellingshausen Sea Bouvet Island ice core Peter I Island Ross Sea Sea ice The Cryosphere Young Island |
genre_facet |
Antarc* Antarctic Bellingshausen Sea Bouvet Island ice core Peter I Island Ross Sea Sea ice The Cryosphere Young Island |
op_source |
The Cryosphere, Vol 15, Pp 1173-1186 (2021) |
op_relation |
doi:10.5194/tc-15-1173-2021 1994-0416 1994-0424 https://tc.copernicus.org/articles/15/1173/2021/tc-15-1173-2021.pdf https://doaj.org/article/1fc00b9e72614d6f9122c986b5e40bfb |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-15-1173-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
2 |
container_start_page |
1173 |
op_container_end_page |
1186 |
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