Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet
The subantarctic island of South Georgia provides terrestrial and coastal marine records of climate variability, which are crucial for the understanding of the drivers of Holocene climate changes in the subantarctic region. Here we investigate a sediment core (Co1305) from a coastal inlet on South G...
Published in: | Quaternary Research |
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2019
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Online Access: | https://researchprofiles.canberra.edu.au/en/publications/27d6e46e-f7f7-443b-a9a1-ce3293818cc1 https://doi.org/10.1017/qua.2018.85 http://www.scopus.com/inward/record.url?scp=85064966338&partnerID=8YFLogxK http://www.mendeley.com/research/holocene-glacier-fluctuations-environmental-changes-subantarctic-south-georgia-inferred-sediment-rec |
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ftcanberrauncris:oai:pure.atira.dk:publications/27d6e46e-f7f7-443b-a9a1-ce3293818cc1 2023-05-15T13:38:46+02:00 Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet Berg, Sonja White, Duanne A. Jivcov, Sandra Melles, Martin Leng, Melanie J. Rethemeyer, Janet Allen, Claire Perren, Bianca Bennike, Ole Viehberg, Finn 2019-01 https://researchprofiles.canberra.edu.au/en/publications/27d6e46e-f7f7-443b-a9a1-ce3293818cc1 https://doi.org/10.1017/qua.2018.85 http://www.scopus.com/inward/record.url?scp=85064966338&partnerID=8YFLogxK http://www.mendeley.com/research/holocene-glacier-fluctuations-environmental-changes-subantarctic-south-georgia-inferred-sediment-rec eng eng info:eu-repo/semantics/closedAccess Berg , S , White , D A , Jivcov , S , Melles , M , Leng , M J , Rethemeyer , J , Allen , C , Perren , B , Bennike , O & Viehberg , F 2019 , ' Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet ' , Quaternary Research (United States) , vol. 91 , no. 1 , pp. 132-148 . https://doi.org/10.1017/qua.2018.85 article 2019 ftcanberrauncris https://doi.org/10.1017/qua.2018.85 2022-10-31T06:47:04Z The subantarctic island of South Georgia provides terrestrial and coastal marine records of climate variability, which are crucial for the understanding of the drivers of Holocene climate changes in the subantarctic region. Here we investigate a sediment core (Co1305) from a coastal inlet on South Georgia using elemental, lipid biomarker, diatom, and stable isotope data to infer changes in environmental conditions and to constrain the timing of late-glacial and Holocene glacier fluctuations. Because of the scarcity of terrestrial macrofossils and the presence of redeposited and relict organic matter in the sediments, age control for the record was obtained by compound-specific radiocarbon dating of mostly marine-derived n-C 16 fatty acids. A basal till layer recovered in Little Jason Lagoon was likely deposited during an advance of local glaciers during the Antarctic cold reversal. After glacier retreat, an oligotrophic lake occupied the site, which transitioned to a marine inlet around 8.0±0.9 ka because of relative sea-level rise. From 7.0±0.6 to 4.0±0.4 ka, reduced vegetation coverage in the catchment, as well as high siliciclastic input and deposition of ice-rafted debris, indicates glacier advances in the terrestrial catchment and likely in the adjacent fjord. A second, less extensive period of glacier advances occurred in the late Holocene, after 1.8±0.3 ka. Article in Journal/Newspaper Antarc* Antarctic University of Canberra Research Portal Antarctic The Antarctic Little Jason ENVELOPE(-36.600,-36.600,-54.183,-54.183) Little Jason Lagoon ENVELOPE(-36.600,-36.600,-54.183,-54.183) Quaternary Research 91 1 132 148 |
institution |
Open Polar |
collection |
University of Canberra Research Portal |
op_collection_id |
ftcanberrauncris |
language |
English |
description |
The subantarctic island of South Georgia provides terrestrial and coastal marine records of climate variability, which are crucial for the understanding of the drivers of Holocene climate changes in the subantarctic region. Here we investigate a sediment core (Co1305) from a coastal inlet on South Georgia using elemental, lipid biomarker, diatom, and stable isotope data to infer changes in environmental conditions and to constrain the timing of late-glacial and Holocene glacier fluctuations. Because of the scarcity of terrestrial macrofossils and the presence of redeposited and relict organic matter in the sediments, age control for the record was obtained by compound-specific radiocarbon dating of mostly marine-derived n-C 16 fatty acids. A basal till layer recovered in Little Jason Lagoon was likely deposited during an advance of local glaciers during the Antarctic cold reversal. After glacier retreat, an oligotrophic lake occupied the site, which transitioned to a marine inlet around 8.0±0.9 ka because of relative sea-level rise. From 7.0±0.6 to 4.0±0.4 ka, reduced vegetation coverage in the catchment, as well as high siliciclastic input and deposition of ice-rafted debris, indicates glacier advances in the terrestrial catchment and likely in the adjacent fjord. A second, less extensive period of glacier advances occurred in the late Holocene, after 1.8±0.3 ka. |
format |
Article in Journal/Newspaper |
author |
Berg, Sonja White, Duanne A. Jivcov, Sandra Melles, Martin Leng, Melanie J. Rethemeyer, Janet Allen, Claire Perren, Bianca Bennike, Ole Viehberg, Finn |
spellingShingle |
Berg, Sonja White, Duanne A. Jivcov, Sandra Melles, Martin Leng, Melanie J. Rethemeyer, Janet Allen, Claire Perren, Bianca Bennike, Ole Viehberg, Finn Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
author_facet |
Berg, Sonja White, Duanne A. Jivcov, Sandra Melles, Martin Leng, Melanie J. Rethemeyer, Janet Allen, Claire Perren, Bianca Bennike, Ole Viehberg, Finn |
author_sort |
Berg, Sonja |
title |
Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
title_short |
Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
title_full |
Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
title_fullStr |
Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
title_full_unstemmed |
Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet |
title_sort |
holocene glacier fluctuations and environmental changes in subantarctic south georgia inferred from a sediment record from a coastal inlet |
publishDate |
2019 |
url |
https://researchprofiles.canberra.edu.au/en/publications/27d6e46e-f7f7-443b-a9a1-ce3293818cc1 https://doi.org/10.1017/qua.2018.85 http://www.scopus.com/inward/record.url?scp=85064966338&partnerID=8YFLogxK http://www.mendeley.com/research/holocene-glacier-fluctuations-environmental-changes-subantarctic-south-georgia-inferred-sediment-rec |
long_lat |
ENVELOPE(-36.600,-36.600,-54.183,-54.183) ENVELOPE(-36.600,-36.600,-54.183,-54.183) |
geographic |
Antarctic The Antarctic Little Jason Little Jason Lagoon |
geographic_facet |
Antarctic The Antarctic Little Jason Little Jason Lagoon |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Berg , S , White , D A , Jivcov , S , Melles , M , Leng , M J , Rethemeyer , J , Allen , C , Perren , B , Bennike , O & Viehberg , F 2019 , ' Holocene glacier fluctuations and environmental changes in subantarctic South Georgia inferred from a sediment record from a coastal inlet ' , Quaternary Research (United States) , vol. 91 , no. 1 , pp. 132-148 . https://doi.org/10.1017/qua.2018.85 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1017/qua.2018.85 |
container_title |
Quaternary Research |
container_volume |
91 |
container_issue |
1 |
container_start_page |
132 |
op_container_end_page |
148 |
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1766110984888385536 |