Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits
Antarctic sea ice is a critical component of the climate system affecting a range of physical and biogeochemical feedbacks and supporting unique ecosystems. During the last glacial stage, Antarctic sea ice was more extensive than today, but uncertainties in geological (marine sediments), glaciologic...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/cp-18-381-2022 https://cp.copernicus.org/articles/18/381/2022/cp-18-381-2022.pdf https://doaj.org/article/3f878391848842cc8e1e1dace712a02e |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:3f878391848842cc8e1e1dace712a02e 2023-05-15T13:56:01+02:00 Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits E. L. McClymont M. J. Bentley D. A. Hodgson C. L. Spencer-Jones T. Wardley M. D. West I. W. Croudace S. Berg D. R. Gröcke G. Kuhn S. S. R. Jamieson L. Sime R. A. Phillips 2022-03-01 https://doi.org/10.5194/cp-18-381-2022 https://cp.copernicus.org/articles/18/381/2022/cp-18-381-2022.pdf https://doaj.org/article/3f878391848842cc8e1e1dace712a02e en eng Copernicus Publications doi:10.5194/cp-18-381-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/381/2022/cp-18-381-2022.pdf https://doaj.org/article/3f878391848842cc8e1e1dace712a02e undefined Climate of the Past, Vol 18, Pp 381-403 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/cp-18-381-2022 2023-01-22T19:12:42Z Antarctic sea ice is a critical component of the climate system affecting a range of physical and biogeochemical feedbacks and supporting unique ecosystems. During the last glacial stage, Antarctic sea ice was more extensive than today, but uncertainties in geological (marine sediments), glaciological (ice core), and climate model reconstructions of past sea-ice extent continue to limit our understanding of its role in the Earth system. Here, we present a novel archive of past sea-ice environments from regurgitated stomach oils of snow petrels (Pagodroma nivea) preserved at nesting sites in Dronning Maud Land, Antarctica. We show that by combining information from fatty acid distributions and their stable carbon isotope ratios with measurements of bulk carbon and nitrogen stable isotopes and trace metal data, it is possible to reconstruct changing snow petrel diet within Marine Isotope Stage 2 (ca. 24.3–30.3 cal kyr BP). We show that, as today, a mixed diet of krill and fish characterizes much of the record. However, between 27.4 and 28.7 cal kyr BP signals of krill almost disappear. By linking dietary signals in the stomach-oil deposits to modern feeding habits and foraging ranges, we infer the use by snow petrels of open-water habitats (“polynyas”) in the sea ice during our interval of study. The periods when consumption of krill was reduced are interpreted to correspond to the opening of polynyas over the continental shelf, which became the preferred foraging habitat. Our results show that extensive, thick, and multiyear sea ice was not always present close to the continent during the last glacial stage and highlight the potential of stomach-oil deposits as a palaeoenvironmental archive of Southern Ocean conditions. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land ice core Sea ice Snow Petrel Snow Petrels Southern Ocean Unknown Antarctic Dronning Maud Land Nivea ENVELOPE(-45.479,-45.479,-60.580,-60.580) Southern Ocean The Antarctic Climate of the Past 18 2 381 403 |
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Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir E. L. McClymont M. J. Bentley D. A. Hodgson C. L. Spencer-Jones T. Wardley M. D. West I. W. Croudace S. Berg D. R. Gröcke G. Kuhn S. S. R. Jamieson L. Sime R. A. Phillips Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
topic_facet |
geo envir |
description |
Antarctic sea ice is a critical component of the climate system affecting a range of physical and biogeochemical feedbacks and supporting unique ecosystems. During the last glacial stage, Antarctic sea ice was more extensive than today, but uncertainties in geological (marine sediments), glaciological (ice core), and climate model reconstructions of past sea-ice extent continue to limit our understanding of its role in the Earth system. Here, we present a novel archive of past sea-ice environments from regurgitated stomach oils of snow petrels (Pagodroma nivea) preserved at nesting sites in Dronning Maud Land, Antarctica. We show that by combining information from fatty acid distributions and their stable carbon isotope ratios with measurements of bulk carbon and nitrogen stable isotopes and trace metal data, it is possible to reconstruct changing snow petrel diet within Marine Isotope Stage 2 (ca. 24.3–30.3 cal kyr BP). We show that, as today, a mixed diet of krill and fish characterizes much of the record. However, between 27.4 and 28.7 cal kyr BP signals of krill almost disappear. By linking dietary signals in the stomach-oil deposits to modern feeding habits and foraging ranges, we infer the use by snow petrels of open-water habitats (“polynyas”) in the sea ice during our interval of study. The periods when consumption of krill was reduced are interpreted to correspond to the opening of polynyas over the continental shelf, which became the preferred foraging habitat. Our results show that extensive, thick, and multiyear sea ice was not always present close to the continent during the last glacial stage and highlight the potential of stomach-oil deposits as a palaeoenvironmental archive of Southern Ocean conditions. |
format |
Article in Journal/Newspaper |
author |
E. L. McClymont M. J. Bentley D. A. Hodgson C. L. Spencer-Jones T. Wardley M. D. West I. W. Croudace S. Berg D. R. Gröcke G. Kuhn S. S. R. Jamieson L. Sime R. A. Phillips |
author_facet |
E. L. McClymont M. J. Bentley D. A. Hodgson C. L. Spencer-Jones T. Wardley M. D. West I. W. Croudace S. Berg D. R. Gröcke G. Kuhn S. S. R. Jamieson L. Sime R. A. Phillips |
author_sort |
E. L. McClymont |
title |
Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
title_short |
Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
title_full |
Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
title_fullStr |
Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
title_full_unstemmed |
Summer sea-ice variability on the Antarctic margin during the last glacial period reconstructed from snow petrel (Pagodroma nivea) stomach-oil deposits |
title_sort |
summer sea-ice variability on the antarctic margin during the last glacial period reconstructed from snow petrel (pagodroma nivea) stomach-oil deposits |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-381-2022 https://cp.copernicus.org/articles/18/381/2022/cp-18-381-2022.pdf https://doaj.org/article/3f878391848842cc8e1e1dace712a02e |
long_lat |
ENVELOPE(-45.479,-45.479,-60.580,-60.580) |
geographic |
Antarctic Dronning Maud Land Nivea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Dronning Maud Land Nivea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Sea ice Snow Petrel Snow Petrels Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land ice core Sea ice Snow Petrel Snow Petrels Southern Ocean |
op_source |
Climate of the Past, Vol 18, Pp 381-403 (2022) |
op_relation |
doi:10.5194/cp-18-381-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/381/2022/cp-18-381-2022.pdf https://doaj.org/article/3f878391848842cc8e1e1dace712a02e |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-18-381-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
2 |
container_start_page |
381 |
op_container_end_page |
403 |
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1766263241565011968 |