Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic
We present three new benthic foraminiferal delta13C, delta18O, and total organic carbon time series from the eastern Atlantic sector of the Southern Ocean between 41°S and 47°S. The measured glacial delta13C values belong to the lowest hitherto reported. We demonstrate a coincidence between depleted...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728242 2023-05-15T13:42:09+02:00 Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic Mackensen, Andreas Rudolph, Miriam Kuhn, Gerhard MEDIAN LATITUDE: -44.398052 * MEDIAN LONGITUDE: -6.101665 * SOUTH-BOUND LATITUDE: -46.511660 * WEST-BOUND LONGITUDE: -15.333330 * NORTH-BOUND LATITUDE: -41.275000 * EAST-BOUND LONGITUDE: 35.898330 * DATE/TIME START: 1993-12-22T11:30:00 * DATE/TIME END: 1994-04-05T10:38:00 2001-09-30 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.728242 https://doi.org/10.1594/PANGAEA.728242 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.728242 https://doi.org/10.1594/PANGAEA.728242 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Mackensen, Andreas; Rudolph, Miriam; Kuhn, Gerhard (2001): Late Pleistocene deep-water circulation in the subantarctic eastern Atlantic. Global and Planetary Change, 30(3-4), 197-229, https://doi.org/10.1016/S0921-8181(01)00102-3 ANT-XI/2 AWI_Paleo Gravity corer (Kiel type) KL Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2495-3 PS2498-1 PS2499-5 PS28 PS28/293 PS28/304 PS28/314 SL South Atlantic Dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.728242 https://doi.org/10.1016/S0921-8181(01)00102-3 2023-01-20T07:31:31Z We present three new benthic foraminiferal delta13C, delta18O, and total organic carbon time series from the eastern Atlantic sector of the Southern Ocean between 41°S and 47°S. The measured glacial delta13C values belong to the lowest hitherto reported. We demonstrate a coincidence between depleted late Holocene (LH) delta13C values and positions of sites relative to ocean surface productivity. A correction of +0.3 to +0.4 [per mil VPDB] for a productivity-induced depletion of Last Glacial Maximum (LGM) benthic delta13C values of these cores is suggested. The new data are compiled with published data from 13 sediment cores from the eastern Atlantic Ocean between 19°S and 47°S, and the regional deep and bottom water circulation is reconstructed for LH (4-0 ka) and LGM (22-16 ka) times. This extends earlier eastern Atlantic-wide synoptic reconstructions which suffered from the lack of data south of 20°S. A conceptual model of LGM deep-water circulation is discussed that, after correction of southernmost cores below the Antarctic Circumpolar Current (ACC) for a productivity-induced artifact, suggests a reduced formation of both North Atlantic Deep Water in the northern Atlantic and bottom water in the southwestern Weddell Sea. This reduction was compensated for by the formation of deep water in the zone of extended winter sea-ice coverage at the northern rim of the Weddell Sea, where air-sea gas exchange was reduced. This shift from LGM deep-water formation in the region south of the ACC to Holocene bottom water formation in the southwestern Weddell Sea, can explain lower preformed d13CDIC values of glacial circumantarctic deep water of approximately 0.3 per mil to 0.4 per mil. Our reconstruction brings Atlantic and Southern Ocean d13C and Cd/Ca data into better agreement, but is in conflict, however, with a scenario of an essentially unchanged thermohaline deep circulation on a global scale. Benthic delta18O-derived LGM bottom water temperatures, by 1.9°C and 0.3°C lower than during the LH at deepest southern and ... Dataset Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Weddell Sea Weddell ENVELOPE(-15.333330,35.898330,-41.275000,-46.511660) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-XI/2 AWI_Paleo Gravity corer (Kiel type) KL Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2495-3 PS2498-1 PS2499-5 PS28 PS28/293 PS28/304 PS28/314 SL South Atlantic |
spellingShingle |
ANT-XI/2 AWI_Paleo Gravity corer (Kiel type) KL Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2495-3 PS2498-1 PS2499-5 PS28 PS28/293 PS28/304 PS28/314 SL South Atlantic Mackensen, Andreas Rudolph, Miriam Kuhn, Gerhard Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
topic_facet |
ANT-XI/2 AWI_Paleo Gravity corer (Kiel type) KL Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2495-3 PS2498-1 PS2499-5 PS28 PS28/293 PS28/304 PS28/314 SL South Atlantic |
description |
We present three new benthic foraminiferal delta13C, delta18O, and total organic carbon time series from the eastern Atlantic sector of the Southern Ocean between 41°S and 47°S. The measured glacial delta13C values belong to the lowest hitherto reported. We demonstrate a coincidence between depleted late Holocene (LH) delta13C values and positions of sites relative to ocean surface productivity. A correction of +0.3 to +0.4 [per mil VPDB] for a productivity-induced depletion of Last Glacial Maximum (LGM) benthic delta13C values of these cores is suggested. The new data are compiled with published data from 13 sediment cores from the eastern Atlantic Ocean between 19°S and 47°S, and the regional deep and bottom water circulation is reconstructed for LH (4-0 ka) and LGM (22-16 ka) times. This extends earlier eastern Atlantic-wide synoptic reconstructions which suffered from the lack of data south of 20°S. A conceptual model of LGM deep-water circulation is discussed that, after correction of southernmost cores below the Antarctic Circumpolar Current (ACC) for a productivity-induced artifact, suggests a reduced formation of both North Atlantic Deep Water in the northern Atlantic and bottom water in the southwestern Weddell Sea. This reduction was compensated for by the formation of deep water in the zone of extended winter sea-ice coverage at the northern rim of the Weddell Sea, where air-sea gas exchange was reduced. This shift from LGM deep-water formation in the region south of the ACC to Holocene bottom water formation in the southwestern Weddell Sea, can explain lower preformed d13CDIC values of glacial circumantarctic deep water of approximately 0.3 per mil to 0.4 per mil. Our reconstruction brings Atlantic and Southern Ocean d13C and Cd/Ca data into better agreement, but is in conflict, however, with a scenario of an essentially unchanged thermohaline deep circulation on a global scale. Benthic delta18O-derived LGM bottom water temperatures, by 1.9°C and 0.3°C lower than during the LH at deepest southern and ... |
format |
Dataset |
author |
Mackensen, Andreas Rudolph, Miriam Kuhn, Gerhard |
author_facet |
Mackensen, Andreas Rudolph, Miriam Kuhn, Gerhard |
author_sort |
Mackensen, Andreas |
title |
Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
title_short |
Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
title_full |
Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
title_fullStr |
Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
title_full_unstemmed |
Stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern Atlantic |
title_sort |
stable isotope ratios, carbon content and primary production of three sediment cores from the subantarctic eastern atlantic |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.728242 https://doi.org/10.1594/PANGAEA.728242 |
op_coverage |
MEDIAN LATITUDE: -44.398052 * MEDIAN LONGITUDE: -6.101665 * SOUTH-BOUND LATITUDE: -46.511660 * WEST-BOUND LONGITUDE: -15.333330 * NORTH-BOUND LATITUDE: -41.275000 * EAST-BOUND LONGITUDE: 35.898330 * DATE/TIME START: 1993-12-22T11:30:00 * DATE/TIME END: 1994-04-05T10:38:00 |
long_lat |
ENVELOPE(-15.333330,35.898330,-41.275000,-46.511660) |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea Weddell |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Sea ice Southern Ocean Weddell Sea |
op_source |
Supplement to: Mackensen, Andreas; Rudolph, Miriam; Kuhn, Gerhard (2001): Late Pleistocene deep-water circulation in the subantarctic eastern Atlantic. Global and Planetary Change, 30(3-4), 197-229, https://doi.org/10.1016/S0921-8181(01)00102-3 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.728242 https://doi.org/10.1594/PANGAEA.728242 |
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.728242 https://doi.org/10.1016/S0921-8181(01)00102-3 |
_version_ |
1766163579352907776 |