Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea
We present biogenic opal flux records from two deep-sea sites in the Scotia Sea (MD07-3133 and MD07-3134) at decadal-scale resolution, covering the last glacial cycle. Besides conventional and time-consuming biogenic opal measuring methods, we introduce new biogenic opal estimation methods derived f...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.789348 2023-05-15T13:42:10+02:00 Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea Sprenk, Daniela Weber, Michael E Kuhn, Gerhard Rosén, Peter Frank, Martin Molina-Kescher, Mario Liebetrau, Volker Röhling, Heinz-Gerd MEDIAN LATITUDE: -58.427400 * MEDIAN LONGITUDE: -42.465400 * SOUTH-BOUND LATITUDE: -59.410800 * WEST-BOUND LONGITUDE: -43.457800 * NORTH-BOUND LATITUDE: -57.444000 * EAST-BOUND LONGITUDE: -41.473000 * DATE/TIME START: 2007-03-05T17:30:00 * DATE/TIME END: 2007-03-06T16:10:00 2013-10-02 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.789348 https://doi.org/10.1594/PANGAEA.789348 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.789348 https://doi.org/10.1594/PANGAEA.789348 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Sprenk, Daniela; Weber, Michael E; Kuhn, Gerhard; Rosén, Peter; Frank, Martin; Molina-Kescher, Mario; Liebetrau, Volker; Röhling, Heinz-Gerd (2013): Southern Ocean bioproductivity during the last glacial cycle - new detection method and decadal-scale insight from the Scotia Sea. Geological Society of London, special issue: Palaeoenvironments and Earth-Surface Processes, 381(1), 245-261, https://doi.org/10.1144/SP381.17 IMAGES International Marine Global Change Study Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.789348 https://doi.org/10.1144/SP381.17 2023-01-20T07:32:44Z We present biogenic opal flux records from two deep-sea sites in the Scotia Sea (MD07-3133 and MD07-3134) at decadal-scale resolution, covering the last glacial cycle. Besides conventional and time-consuming biogenic opal measuring methods, we introduce new biogenic opal estimation methods derived from sediment colour b*, wet bulk density, Si/Ti-count ratio, and Fourier transform infrared spectroscopy (FTIRS). All methods capture the biogenic opal amplitude, however, FTIRS - a novel method for marine sediment - yields the most reliable results. 230Th normalization data show strong differences in sediment focusing with intensified sediment focusing during glacial times. At MD07-3134 230Th normalized biogenic opal fluxes vary between 0.2 and 2.5 g/cm2/kyr. Our biogenic opal flux records indicate bioproductivity changes in the Southern Ocean, strongly influenced by sea ice distribution and also summer sea surface temperature changes. South of the Antarctic Polar Front, lowest bioproductivity occurred during the Last Glacial Maximum when upwelling of mid-depth water was reduced and sea ice cover intensified. Around 17 ka, bioproductivity increased abruptly, corresponding to rising atmospheric CO2 contents and decreasing seasonal sea ice coverage. Dataset Antarc* Antarctic Scotia Sea Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Scotia Sea ENVELOPE(-43.457800,-41.473000,-57.444000,-59.410800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
IMAGES International Marine Global Change Study |
spellingShingle |
IMAGES International Marine Global Change Study Sprenk, Daniela Weber, Michael E Kuhn, Gerhard Rosén, Peter Frank, Martin Molina-Kescher, Mario Liebetrau, Volker Röhling, Heinz-Gerd Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
topic_facet |
IMAGES International Marine Global Change Study |
description |
We present biogenic opal flux records from two deep-sea sites in the Scotia Sea (MD07-3133 and MD07-3134) at decadal-scale resolution, covering the last glacial cycle. Besides conventional and time-consuming biogenic opal measuring methods, we introduce new biogenic opal estimation methods derived from sediment colour b*, wet bulk density, Si/Ti-count ratio, and Fourier transform infrared spectroscopy (FTIRS). All methods capture the biogenic opal amplitude, however, FTIRS - a novel method for marine sediment - yields the most reliable results. 230Th normalization data show strong differences in sediment focusing with intensified sediment focusing during glacial times. At MD07-3134 230Th normalized biogenic opal fluxes vary between 0.2 and 2.5 g/cm2/kyr. Our biogenic opal flux records indicate bioproductivity changes in the Southern Ocean, strongly influenced by sea ice distribution and also summer sea surface temperature changes. South of the Antarctic Polar Front, lowest bioproductivity occurred during the Last Glacial Maximum when upwelling of mid-depth water was reduced and sea ice cover intensified. Around 17 ka, bioproductivity increased abruptly, corresponding to rising atmospheric CO2 contents and decreasing seasonal sea ice coverage. |
format |
Dataset |
author |
Sprenk, Daniela Weber, Michael E Kuhn, Gerhard Rosén, Peter Frank, Martin Molina-Kescher, Mario Liebetrau, Volker Röhling, Heinz-Gerd |
author_facet |
Sprenk, Daniela Weber, Michael E Kuhn, Gerhard Rosén, Peter Frank, Martin Molina-Kescher, Mario Liebetrau, Volker Röhling, Heinz-Gerd |
author_sort |
Sprenk, Daniela |
title |
Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
title_short |
Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
title_full |
Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
title_fullStr |
Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
title_full_unstemmed |
Biogenic opal estimation of deep-sea sediment cores from the Scotia Sea |
title_sort |
biogenic opal estimation of deep-sea sediment cores from the scotia sea |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.789348 https://doi.org/10.1594/PANGAEA.789348 |
op_coverage |
MEDIAN LATITUDE: -58.427400 * MEDIAN LONGITUDE: -42.465400 * SOUTH-BOUND LATITUDE: -59.410800 * WEST-BOUND LONGITUDE: -43.457800 * NORTH-BOUND LATITUDE: -57.444000 * EAST-BOUND LONGITUDE: -41.473000 * DATE/TIME START: 2007-03-05T17:30:00 * DATE/TIME END: 2007-03-06T16:10:00 |
long_lat |
ENVELOPE(-43.457800,-41.473000,-57.444000,-59.410800) |
geographic |
Antarctic Southern Ocean The Antarctic Scotia Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Scotia Sea |
genre |
Antarc* Antarctic Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Scotia Sea Sea ice Southern Ocean |
op_source |
Supplement to: Sprenk, Daniela; Weber, Michael E; Kuhn, Gerhard; Rosén, Peter; Frank, Martin; Molina-Kescher, Mario; Liebetrau, Volker; Röhling, Heinz-Gerd (2013): Southern Ocean bioproductivity during the last glacial cycle - new detection method and decadal-scale insight from the Scotia Sea. Geological Society of London, special issue: Palaeoenvironments and Earth-Surface Processes, 381(1), 245-261, https://doi.org/10.1144/SP381.17 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.789348 https://doi.org/10.1594/PANGAEA.789348 |
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.789348 https://doi.org/10.1144/SP381.17 |
_version_ |
1766164337211211776 |