Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia
The study of radiolarian assemblages from Core MD 962086 provides new information on the variability in the upwelling intensity and origin of upwelled water masses over the past 350 ky in one of the major filamentous regions of the Benguela Upwelling System (BUS), located off Lüderitz, Namibia. The...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.714867 2024-09-15T17:41:05+00:00 Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia Jacot des Combes, Hélène Abelmann, Andrea LATITUDE: -25.813330 * LONGITUDE: 12.128330 * DATE/TIME START: 1996-10-05T00:00:00 * DATE/TIME END: 1996-10-05T00:00:00 2007 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.714867 https://doi.org/10.1594/PANGAEA.714867 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.714867 https://doi.org/10.1594/PANGAEA.714867 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Jacot des Combes, Hélène; Abelmann, Andrea (2007): A 350-ky radiolarian record off Lüderitz, Namibia - evidence for changes in the upwelling regime. Marine Micropaleontology, 62(3), 194-210, https://doi.org/10.1016/j.marmicro.2006.08.004 AWI_Paleo CALYPSO Calypso Corer IMAGES IMAGES II International Marine Global Change Study Lüderitz Transect Marion Dufresne (1995) MD105 MD962086 MD96-2086 Paleoenvironmental Reconstructions from Marine Sediments @ AWI Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 dataset publication series 2007 ftpangaea https://doi.org/10.1594/PANGAEA.71486710.1016/j.marmicro.2006.08.004 2024-07-24T02:31:20Z The study of radiolarian assemblages from Core MD 962086 provides new information on the variability in the upwelling intensity and origin of upwelled water masses over the past 350 ky in one of the major filamentous regions of the Benguela Upwelling System (BUS), located off Lüderitz, Namibia. The use of key radiolarian species to trace the source of upwelled waters, and the use of a radiolarian-based upwelling index (URI) to reconstruct the upwelling intensity represent the first use of radiolarians for paleoceanographic reconstructions in the BUS. These radiolarian-based proxies indicate strongest upwelling during Marine Isotope Stages (MIS) 3, 5, and 8, which compares well with other studies. While during MIS 3 and 8, the radiolarian-based proxies indicate the influx of waters of Southern Ocean origin, they also point to the increased influence of tropical waters during the lower portion of MIS 5. During MIS 2, 4 and 6 the radiolarian assemblages indicate generally lower upwelling intensities, although this signal is complicated by the increased occurrence of organic carbon in the sediments during these intervals. During MIS 2 there appears to be less of an input of Southern Ocean waters to the BUS, although during the also glacial MIS 4 and 6, there is evidence for an increased influence of cold Antarctic waters. The comparison of the results from Core MD 962086 with other studies in the BUS area indicates a non-uniform pattern of upwelling intensity and advection of cold, southern waters into this system during MIS 2. Weaker upwelling signaled by the radiolarian-based proxy in MIS 4 is in contrast to other studies that indicate higher productivity during this time period. In general, the data show that there is a strong spatiotemporal complexity in upwelling intensity in the BUS and that the advection of water into it is not strongly tied to glacial–interglacial variations in climate. Other/Unknown Material Antarc* Antarctic Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(12.128330,12.128330,-25.813330,-25.813330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo CALYPSO Calypso Corer IMAGES IMAGES II International Marine Global Change Study Lüderitz Transect Marion Dufresne (1995) MD105 MD962086 MD96-2086 Paleoenvironmental Reconstructions from Marine Sediments @ AWI Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 |
spellingShingle |
AWI_Paleo CALYPSO Calypso Corer IMAGES IMAGES II International Marine Global Change Study Lüderitz Transect Marion Dufresne (1995) MD105 MD962086 MD96-2086 Paleoenvironmental Reconstructions from Marine Sediments @ AWI Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 Jacot des Combes, Hélène Abelmann, Andrea Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
topic_facet |
AWI_Paleo CALYPSO Calypso Corer IMAGES IMAGES II International Marine Global Change Study Lüderitz Transect Marion Dufresne (1995) MD105 MD962086 MD96-2086 Paleoenvironmental Reconstructions from Marine Sediments @ AWI Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 |
description |
The study of radiolarian assemblages from Core MD 962086 provides new information on the variability in the upwelling intensity and origin of upwelled water masses over the past 350 ky in one of the major filamentous regions of the Benguela Upwelling System (BUS), located off Lüderitz, Namibia. The use of key radiolarian species to trace the source of upwelled waters, and the use of a radiolarian-based upwelling index (URI) to reconstruct the upwelling intensity represent the first use of radiolarians for paleoceanographic reconstructions in the BUS. These radiolarian-based proxies indicate strongest upwelling during Marine Isotope Stages (MIS) 3, 5, and 8, which compares well with other studies. While during MIS 3 and 8, the radiolarian-based proxies indicate the influx of waters of Southern Ocean origin, they also point to the increased influence of tropical waters during the lower portion of MIS 5. During MIS 2, 4 and 6 the radiolarian assemblages indicate generally lower upwelling intensities, although this signal is complicated by the increased occurrence of organic carbon in the sediments during these intervals. During MIS 2 there appears to be less of an input of Southern Ocean waters to the BUS, although during the also glacial MIS 4 and 6, there is evidence for an increased influence of cold Antarctic waters. The comparison of the results from Core MD 962086 with other studies in the BUS area indicates a non-uniform pattern of upwelling intensity and advection of cold, southern waters into this system during MIS 2. Weaker upwelling signaled by the radiolarian-based proxy in MIS 4 is in contrast to other studies that indicate higher productivity during this time period. In general, the data show that there is a strong spatiotemporal complexity in upwelling intensity in the BUS and that the advection of water into it is not strongly tied to glacial–interglacial variations in climate. |
format |
Other/Unknown Material |
author |
Jacot des Combes, Hélène Abelmann, Andrea |
author_facet |
Jacot des Combes, Hélène Abelmann, Andrea |
author_sort |
Jacot des Combes, Hélène |
title |
Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
title_short |
Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
title_full |
Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
title_fullStr |
Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
title_full_unstemmed |
Radiolarian fauna of sediment core MD96-2089 off Lüderitz, Namibia |
title_sort |
radiolarian fauna of sediment core md96-2089 off lüderitz, namibia |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.714867 https://doi.org/10.1594/PANGAEA.714867 |
op_coverage |
LATITUDE: -25.813330 * LONGITUDE: 12.128330 * DATE/TIME START: 1996-10-05T00:00:00 * DATE/TIME END: 1996-10-05T00:00:00 |
long_lat |
ENVELOPE(12.128330,12.128330,-25.813330,-25.813330) |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Supplement to: Jacot des Combes, Hélène; Abelmann, Andrea (2007): A 350-ky radiolarian record off Lüderitz, Namibia - evidence for changes in the upwelling regime. Marine Micropaleontology, 62(3), 194-210, https://doi.org/10.1016/j.marmicro.2006.08.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.714867 https://doi.org/10.1594/PANGAEA.714867 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71486710.1016/j.marmicro.2006.08.004 |
_version_ |
1810487176048148480 |