Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions
Laminated sediments are unique archives of palaeoenvironmental and palaeoceanographic conditions, recording changes on seasonal and interannual timescales. Diatom-rich laminated marine sediments are examined from Dumont d’Urville Trough, East Antarctic Margin, to determine changes in environmental c...
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crsagepubl:10.1177/0959683611434223 2024-10-13T14:02:51+00:00 Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions Maddison, Eleanor J Pike, Jennifer Dunbar, Robert 2012 http://dx.doi.org/10.1177/0959683611434223 https://journals.sagepub.com/doi/pdf/10.1177/0959683611434223 https://journals.sagepub.com/doi/full-xml/10.1177/0959683611434223 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 22, issue 8, page 857-875 ISSN 0959-6836 1477-0911 journal-article 2012 crsagepubl https://doi.org/10.1177/0959683611434223 2024-09-24T04:15:01Z Laminated sediments are unique archives of palaeoenvironmental and palaeoceanographic conditions, recording changes on seasonal and interannual timescales. Diatom-rich laminated marine sediments are examined from Dumont d’Urville Trough, East Antarctic Margin, to determine changes in environmental conditions on the continental shelf from 1136 to 3122 cal. yr BP. Scanning electron microscope backscattered electron imagery (BSEI) and secondary electron imagery are used to analyse diatom assemblages from laminations and to determine interlamina relationships. Diatom observations are quantified with conventional assemblage counts. Laminae are primarily classified according to visually dominant species identified in BSEI and, secondarily, by terrigenous content. Nine lamina types are identified and are characterized by: Hyalochaete Chaetoceros spp. resting spores (CRS); CRS and Fragilariopsis spp.; Fragilariopsis spp.; Corethron pennatum and Rhizosolenia spp.; C. pennatum; Rhizosolenia spp.; mixed diatom assemblage; Stellarima microtrias resting spores (RS), Porosira glacialis RS and Coscinodiscus bouvet; and P. glacialis RS. Formation of each lamina type is controlled by seasonal changes in sea ice cover, nutrient levels and water column stability. Quantitative diatom assemblage analysis revealed that each lamina type is dominated by CRS and Fragilariopsis sea ice taxa, indicating that sea ice cover was extensive and persistent in the late Holocene. However the lamina types indicate that the sea ice regime was not consistent throughout this period, notably that a relatively warmer period, ~3100 to 2500 cal. yr BP, was followed by cooling which resulted in an increase in year round sea ice by ~1100 cal. yr BP. Article in Journal/Newspaper Antarc* Antarctic Sea ice SAGE Publications Antarctic Bouvet ENVELOPE(3.358,3.358,-54.422,-54.422) Dumont d’Urville ENVELOPE(140.000,140.000,-66.667,-66.667) The Holocene 22 8 857 875 |
institution |
Open Polar |
collection |
SAGE Publications |
op_collection_id |
crsagepubl |
language |
English |
description |
Laminated sediments are unique archives of palaeoenvironmental and palaeoceanographic conditions, recording changes on seasonal and interannual timescales. Diatom-rich laminated marine sediments are examined from Dumont d’Urville Trough, East Antarctic Margin, to determine changes in environmental conditions on the continental shelf from 1136 to 3122 cal. yr BP. Scanning electron microscope backscattered electron imagery (BSEI) and secondary electron imagery are used to analyse diatom assemblages from laminations and to determine interlamina relationships. Diatom observations are quantified with conventional assemblage counts. Laminae are primarily classified according to visually dominant species identified in BSEI and, secondarily, by terrigenous content. Nine lamina types are identified and are characterized by: Hyalochaete Chaetoceros spp. resting spores (CRS); CRS and Fragilariopsis spp.; Fragilariopsis spp.; Corethron pennatum and Rhizosolenia spp.; C. pennatum; Rhizosolenia spp.; mixed diatom assemblage; Stellarima microtrias resting spores (RS), Porosira glacialis RS and Coscinodiscus bouvet; and P. glacialis RS. Formation of each lamina type is controlled by seasonal changes in sea ice cover, nutrient levels and water column stability. Quantitative diatom assemblage analysis revealed that each lamina type is dominated by CRS and Fragilariopsis sea ice taxa, indicating that sea ice cover was extensive and persistent in the late Holocene. However the lamina types indicate that the sea ice regime was not consistent throughout this period, notably that a relatively warmer period, ~3100 to 2500 cal. yr BP, was followed by cooling which resulted in an increase in year round sea ice by ~1100 cal. yr BP. |
format |
Article in Journal/Newspaper |
author |
Maddison, Eleanor J Pike, Jennifer Dunbar, Robert |
spellingShingle |
Maddison, Eleanor J Pike, Jennifer Dunbar, Robert Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
author_facet |
Maddison, Eleanor J Pike, Jennifer Dunbar, Robert |
author_sort |
Maddison, Eleanor J |
title |
Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
title_short |
Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
title_full |
Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
title_fullStr |
Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
title_full_unstemmed |
Seasonally laminated diatom-rich sediments from Dumont d’Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions |
title_sort |
seasonally laminated diatom-rich sediments from dumont d’urville trough, east antarctic margin: late-holocene neoglacial sea-ice conditions |
publisher |
SAGE Publications |
publishDate |
2012 |
url |
http://dx.doi.org/10.1177/0959683611434223 https://journals.sagepub.com/doi/pdf/10.1177/0959683611434223 https://journals.sagepub.com/doi/full-xml/10.1177/0959683611434223 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(140.000,140.000,-66.667,-66.667) |
geographic |
Antarctic Bouvet Dumont d’Urville |
geographic_facet |
Antarctic Bouvet Dumont d’Urville |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
The Holocene volume 22, issue 8, page 857-875 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683611434223 |
container_title |
The Holocene |
container_volume |
22 |
container_issue |
8 |
container_start_page |
857 |
op_container_end_page |
875 |
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1812819303759609856 |