(Table 1) Age determination of sediment core MD02-2589
Sortable silt mean grain sizes together with oxygen and carbon isotopic data produced on the benthic foraminiferal species Fontbotia wuellerstorfi are used to construct high-resolution records of near-bottom flow vigour and deep water ventilation at a core site MD02-2589 located at 2660 m water dept...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.832863 2023-05-15T13:49:51+02:00 (Table 1) Age determination of sediment core MD02-2589 Molyneux, Elizabeth G Hall, Ian R Zahn, Rainer Diz, Paula LATITUDE: -41.433830 * LONGITUDE: 25.221670 * DATE/TIME START: 2002-10-01T00:00:00 * DATE/TIME END: 2002-10-01T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.055 m * MAXIMUM DEPTH, sediment/rock: 1.905 m 2007-05-21 text/tab-separated-values, 104 data points https://doi.pangaea.de/10.1594/PANGAEA.832863 https://doi.org/10.1594/PANGAEA.832863 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.832863 https://doi.org/10.1594/PANGAEA.832863 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Molyneux, Elizabeth G; Hall, Ian R; Zahn, Rainer; Diz, Paula (2007): Deep water variability on the southern Agulhas Plateau: Interhemispheric links over the past 170 ka. Paleoceanography, 22(4), PA4209, https://doi.org/10.1029/2006PA001407 Age 14C AMS 14C calibrated dated dated material dated standard deviation Calendar age standard deviation CALYPSO Calypso Corer Depth bottom/max sediment/rock top/min Laboratory code/label Marion Dufresne (1995) MD02-2589 MD128 Southern Ocean SWAF Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.832863 https://doi.org/10.1029/2006PA001407 2023-01-20T09:03:19Z Sortable silt mean grain sizes together with oxygen and carbon isotopic data produced on the benthic foraminiferal species Fontbotia wuellerstorfi are used to construct high-resolution records of near-bottom flow vigour and deep water ventilation at a core site MD02-2589 located at 2660 m water depth on the southern Agulhas Plateau. The results suggest that during glacial periods (marine oxygen isotope stages 2 and 6, MIS 2 and MIS 6, respectively), there was a persistent contribution of a well-ventilated water mass within the Atlantic to Indian oceanic gateway with a d13C signature similar to present-day Northern Component Water (NCW), e.g., North Atlantic Deep Water (NADW). The records of chemical ventilation and near-bottom flow vigor reflect changes in the advection of northern source waters and meridional variability in the location of the Antarctic Circumpolar Current and its associated fronts. We suggest that during Termination II (TII), changes in chemical ventilation are largely decoupled from near-bottom physical flow speeds. A mid-TII climate optimum is associated with a low-flow speed plateau concurrent with a period of increased ventilation shown in the benthic d13C of other Southern Ocean records but not in our benthic d13C of MD02-2589. The climate optimum is followed by a period of southern cooling around 128 ka coincident with a stronger influence of NCW to interglacial levels at around 124 ka. All proxy records show a near synchronous and rapid shift during the transition from MIS 5a-4 (73 ka). This large event is attributed to a rapid decrease in NADW influence and replacement over the Agulhas Plateau by southern source waters. Dataset Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Indian ENVELOPE(25.221670,25.221670,-41.433830,-41.433830) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C calibrated dated dated material dated standard deviation Calendar age standard deviation CALYPSO Calypso Corer Depth bottom/max sediment/rock top/min Laboratory code/label Marion Dufresne (1995) MD02-2589 MD128 Southern Ocean SWAF |
spellingShingle |
Age 14C AMS 14C calibrated dated dated material dated standard deviation Calendar age standard deviation CALYPSO Calypso Corer Depth bottom/max sediment/rock top/min Laboratory code/label Marion Dufresne (1995) MD02-2589 MD128 Southern Ocean SWAF Molyneux, Elizabeth G Hall, Ian R Zahn, Rainer Diz, Paula (Table 1) Age determination of sediment core MD02-2589 |
topic_facet |
Age 14C AMS 14C calibrated dated dated material dated standard deviation Calendar age standard deviation CALYPSO Calypso Corer Depth bottom/max sediment/rock top/min Laboratory code/label Marion Dufresne (1995) MD02-2589 MD128 Southern Ocean SWAF |
description |
Sortable silt mean grain sizes together with oxygen and carbon isotopic data produced on the benthic foraminiferal species Fontbotia wuellerstorfi are used to construct high-resolution records of near-bottom flow vigour and deep water ventilation at a core site MD02-2589 located at 2660 m water depth on the southern Agulhas Plateau. The results suggest that during glacial periods (marine oxygen isotope stages 2 and 6, MIS 2 and MIS 6, respectively), there was a persistent contribution of a well-ventilated water mass within the Atlantic to Indian oceanic gateway with a d13C signature similar to present-day Northern Component Water (NCW), e.g., North Atlantic Deep Water (NADW). The records of chemical ventilation and near-bottom flow vigor reflect changes in the advection of northern source waters and meridional variability in the location of the Antarctic Circumpolar Current and its associated fronts. We suggest that during Termination II (TII), changes in chemical ventilation are largely decoupled from near-bottom physical flow speeds. A mid-TII climate optimum is associated with a low-flow speed plateau concurrent with a period of increased ventilation shown in the benthic d13C of other Southern Ocean records but not in our benthic d13C of MD02-2589. The climate optimum is followed by a period of southern cooling around 128 ka coincident with a stronger influence of NCW to interglacial levels at around 124 ka. All proxy records show a near synchronous and rapid shift during the transition from MIS 5a-4 (73 ka). This large event is attributed to a rapid decrease in NADW influence and replacement over the Agulhas Plateau by southern source waters. |
format |
Dataset |
author |
Molyneux, Elizabeth G Hall, Ian R Zahn, Rainer Diz, Paula |
author_facet |
Molyneux, Elizabeth G Hall, Ian R Zahn, Rainer Diz, Paula |
author_sort |
Molyneux, Elizabeth G |
title |
(Table 1) Age determination of sediment core MD02-2589 |
title_short |
(Table 1) Age determination of sediment core MD02-2589 |
title_full |
(Table 1) Age determination of sediment core MD02-2589 |
title_fullStr |
(Table 1) Age determination of sediment core MD02-2589 |
title_full_unstemmed |
(Table 1) Age determination of sediment core MD02-2589 |
title_sort |
(table 1) age determination of sediment core md02-2589 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.832863 https://doi.org/10.1594/PANGAEA.832863 |
op_coverage |
LATITUDE: -41.433830 * LONGITUDE: 25.221670 * DATE/TIME START: 2002-10-01T00:00:00 * DATE/TIME END: 2002-10-01T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.055 m * MAXIMUM DEPTH, sediment/rock: 1.905 m |
long_lat |
ENVELOPE(25.221670,25.221670,-41.433830,-41.433830) |
geographic |
Antarctic Southern Ocean The Antarctic Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
Supplement to: Molyneux, Elizabeth G; Hall, Ian R; Zahn, Rainer; Diz, Paula (2007): Deep water variability on the southern Agulhas Plateau: Interhemispheric links over the past 170 ka. Paleoceanography, 22(4), PA4209, https://doi.org/10.1029/2006PA001407 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.832863 https://doi.org/10.1594/PANGAEA.832863 |
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.832863 https://doi.org/10.1029/2006PA001407 |
_version_ |
1766252431430123520 |