Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597
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 environmen...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.806336 2023-05-15T13:42:10+02:00 Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 Maddison, Eleanor J Pike, Jennifer Dunbar, Robert G MEDIAN LATITUDE: -66.412514 * MEDIAN LONGITUDE: 140.420833 * SOUTH-BOUND LATITUDE: -66.414420 * WEST-BOUND LONGITUDE: 140.419400 * NORTH-BOUND LATITUDE: -66.412300 * EAST-BOUND LONGITUDE: 140.421000 * DATE/TIME START: 2001-01-01T00:00:00 * DATE/TIME END: 2003-02-05T13:04:00 2012-01-31 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.806336 https://doi.org/10.1594/PANGAEA.806336 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.806336 https://doi.org/10.1594/PANGAEA.806336 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Maddison, Eleanor J; Pike, Jennifer; Dunbar, Robert G (2012): Seasonally laminated diatom-rich sediments from Dumont d'Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions. The Holocene, 22(8), 857-875, https://doi.org/10.1177/0959683611434223 International Polar Year (2007-2008) IPY Dataset 2012 ftpangaea https://doi.org/10.1594/PANGAEA.806336 https://doi.org/10.1177/0959683611434223 2023-01-20T07:32:53Z 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. Dataset Antarc* Antarctic International Polar Year IPY Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Bouvet ENVELOPE(3.358,3.358,-54.422,-54.422) Dumont d'Urville Trough ENVELOPE(136.000,136.000,-65.500,-65.500) ENVELOPE(140.419400,140.421000,-66.412300,-66.414420) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
International Polar Year (2007-2008) IPY |
spellingShingle |
International Polar Year (2007-2008) IPY Maddison, Eleanor J Pike, Jennifer Dunbar, Robert G Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
topic_facet |
International Polar Year (2007-2008) IPY |
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 |
Dataset |
author |
Maddison, Eleanor J Pike, Jennifer Dunbar, Robert G |
author_facet |
Maddison, Eleanor J Pike, Jennifer Dunbar, Robert G |
author_sort |
Maddison, Eleanor J |
title |
Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
title_short |
Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
title_full |
Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
title_fullStr |
Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
title_full_unstemmed |
Radiocarbon ages, diatom abundance and laminae description of sediment core MD03-2597 |
title_sort |
radiocarbon ages, diatom abundance and laminae description of sediment core md03-2597 |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.806336 https://doi.org/10.1594/PANGAEA.806336 |
op_coverage |
MEDIAN LATITUDE: -66.412514 * MEDIAN LONGITUDE: 140.420833 * SOUTH-BOUND LATITUDE: -66.414420 * WEST-BOUND LONGITUDE: 140.419400 * NORTH-BOUND LATITUDE: -66.412300 * EAST-BOUND LONGITUDE: 140.421000 * DATE/TIME START: 2001-01-01T00:00:00 * DATE/TIME END: 2003-02-05T13:04:00 |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(136.000,136.000,-65.500,-65.500) ENVELOPE(140.419400,140.421000,-66.412300,-66.414420) |
geographic |
Antarctic Dumont d'Urville Dumont-d'Urville Bouvet Dumont d'Urville Trough |
geographic_facet |
Antarctic Dumont d'Urville Dumont-d'Urville Bouvet Dumont d'Urville Trough |
genre |
Antarc* Antarctic International Polar Year IPY Sea ice |
genre_facet |
Antarc* Antarctic International Polar Year IPY Sea ice |
op_source |
Supplement to: Maddison, Eleanor J; Pike, Jennifer; Dunbar, Robert G (2012): Seasonally laminated diatom-rich sediments from Dumont d'Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions. The Holocene, 22(8), 857-875, https://doi.org/10.1177/0959683611434223 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.806336 https://doi.org/10.1594/PANGAEA.806336 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.806336 https://doi.org/10.1177/0959683611434223 |
_version_ |
1766164381452730368 |