Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13
Salty and warm Indian Ocean waters enter the South Atlantic via the Agulhas leakage, south of Africa. Model simulations and proxy evidence of Agulhas leakage strengthening during glacial terminations led to the hypothesis that it was an important modulator of the Atlantic Ocean circulation. Yet, the...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.844570 2023-05-15T17:35:39+02:00 Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 Scussolini, Paolo Marino, Gianluca Brummer, Geert-Jan A Peeters, Frank J C LATITUDE: -29.761800 * LONGITUDE: 2.401600 * MINIMUM DEPTH, sediment/rock: 1.08 m * MAXIMUM DEPTH, sediment/rock: 1.94 m 2015-03-20 text/tab-separated-values, 561 data points https://doi.pangaea.de/10.1594/PANGAEA.844570 https://doi.org/10.1594/PANGAEA.844570 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.844570 https://doi.org/10.1594/PANGAEA.844570 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Scussolini, Paolo; Marino, Gianluca; Brummer, Geert-Jan A; Peeters, Frank J C (2015): Saline Indian Ocean waters invaded the South Atlantic thermocline during glacial termination II. Geology, 43(2), 139-142, https://doi.org/10.1130/G36238.1 64PE-174P13 AGE Calculated Calculated from Mg/Ca ratios (Anand et al. 2003) Calculated from Mg/Ca ratios (Regenberg et al. 2009) DEPTH sediment/rock Globigerinoides ruber sensu lato δ18O Globorotalia truncatulinoides sinistral δ13C PC Piston corer Sea surface temperature Thermocline water temperature Walvis Ridge water Dataset 2015 ftpangaea https://doi.org/10.1594/PANGAEA.844570 https://doi.org/10.1130/G36238.1 2023-01-20T09:05:43Z Salty and warm Indian Ocean waters enter the South Atlantic via the Agulhas leakage, south of Africa. Model simulations and proxy evidence of Agulhas leakage strengthening during glacial terminations led to the hypothesis that it was an important modulator of the Atlantic Ocean circulation. Yet, the fate of the leakage salinity and temperature anomalies remains undocumented beyond the southern tip of Africa. Downstream of the leakage, new paleoceanographic evidence from the central Walvis Ridge (southeast Atlantic) shows that salinity increased at the thermocline, and less so at the surface, during glacial termination II. Thermocline salinity change coincided with higher frequency of Agulhas rings passage at the core location and with salinity maxima in the Agulhas leakage area, suggesting that leakage waters were incorporated in the Atlantic circulation through the thermocline. Hydrographic changes at the Walvis Ridge and in the leakage area display a distinct two-step structure, with a reversal at ca. 134 ka. This matched a wet interlude within the East Asia weak monsoon interval of termination II, and a short-lived North Atlantic warming. Such concurrence points to a Bølling-Allerød-like recovery of the Atlantic circulation amidst termination II, with a northward shift of the Intertropical Convergence Zone and Southern Hemisphere westerlies, and attendant curtailment of the interocean connection south of Africa. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Indian ENVELOPE(2.401600,2.401600,-29.761800,-29.761800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
64PE-174P13 AGE Calculated Calculated from Mg/Ca ratios (Anand et al. 2003) Calculated from Mg/Ca ratios (Regenberg et al. 2009) DEPTH sediment/rock Globigerinoides ruber sensu lato δ18O Globorotalia truncatulinoides sinistral δ13C PC Piston corer Sea surface temperature Thermocline water temperature Walvis Ridge water |
spellingShingle |
64PE-174P13 AGE Calculated Calculated from Mg/Ca ratios (Anand et al. 2003) Calculated from Mg/Ca ratios (Regenberg et al. 2009) DEPTH sediment/rock Globigerinoides ruber sensu lato δ18O Globorotalia truncatulinoides sinistral δ13C PC Piston corer Sea surface temperature Thermocline water temperature Walvis Ridge water Scussolini, Paolo Marino, Gianluca Brummer, Geert-Jan A Peeters, Frank J C Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
topic_facet |
64PE-174P13 AGE Calculated Calculated from Mg/Ca ratios (Anand et al. 2003) Calculated from Mg/Ca ratios (Regenberg et al. 2009) DEPTH sediment/rock Globigerinoides ruber sensu lato δ18O Globorotalia truncatulinoides sinistral δ13C PC Piston corer Sea surface temperature Thermocline water temperature Walvis Ridge water |
description |
Salty and warm Indian Ocean waters enter the South Atlantic via the Agulhas leakage, south of Africa. Model simulations and proxy evidence of Agulhas leakage strengthening during glacial terminations led to the hypothesis that it was an important modulator of the Atlantic Ocean circulation. Yet, the fate of the leakage salinity and temperature anomalies remains undocumented beyond the southern tip of Africa. Downstream of the leakage, new paleoceanographic evidence from the central Walvis Ridge (southeast Atlantic) shows that salinity increased at the thermocline, and less so at the surface, during glacial termination II. Thermocline salinity change coincided with higher frequency of Agulhas rings passage at the core location and with salinity maxima in the Agulhas leakage area, suggesting that leakage waters were incorporated in the Atlantic circulation through the thermocline. Hydrographic changes at the Walvis Ridge and in the leakage area display a distinct two-step structure, with a reversal at ca. 134 ka. This matched a wet interlude within the East Asia weak monsoon interval of termination II, and a short-lived North Atlantic warming. Such concurrence points to a Bølling-Allerød-like recovery of the Atlantic circulation amidst termination II, with a northward shift of the Intertropical Convergence Zone and Southern Hemisphere westerlies, and attendant curtailment of the interocean connection south of Africa. |
format |
Dataset |
author |
Scussolini, Paolo Marino, Gianluca Brummer, Geert-Jan A Peeters, Frank J C |
author_facet |
Scussolini, Paolo Marino, Gianluca Brummer, Geert-Jan A Peeters, Frank J C |
author_sort |
Scussolini, Paolo |
title |
Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
title_short |
Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
title_full |
Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
title_fullStr |
Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
title_full_unstemmed |
Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 |
title_sort |
planktic foraminifera isotopes, temperature and δ¹⁸o of seawater at the central walvis ridge for termination ii (mis 6 to 5), sediment core 64pe-174p13 |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.844570 https://doi.org/10.1594/PANGAEA.844570 |
op_coverage |
LATITUDE: -29.761800 * LONGITUDE: 2.401600 * MINIMUM DEPTH, sediment/rock: 1.08 m * MAXIMUM DEPTH, sediment/rock: 1.94 m |
long_lat |
ENVELOPE(2.401600,2.401600,-29.761800,-29.761800) |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Scussolini, Paolo; Marino, Gianluca; Brummer, Geert-Jan A; Peeters, Frank J C (2015): Saline Indian Ocean waters invaded the South Atlantic thermocline during glacial termination II. Geology, 43(2), 139-142, https://doi.org/10.1130/G36238.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.844570 https://doi.org/10.1594/PANGAEA.844570 |
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.844570 https://doi.org/10.1130/G36238.1 |
_version_ |
1766134889342566400 |