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Scussolini, Paolo; Marino, Gianluca; Brummer, Geert-Jan A; Peeters, Frank J C (2015): Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13. PANGAEA, https://doi.org/10.1594/PANGAEA.844570, Supplement to: Scussolini, P et al. (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

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Abstract:
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.
Coverage:
Latitude: -29.761800 * Longitude: 2.401600
Minimum DEPTH, sediment/rock: 1.08 m * Maximum DEPTH, sediment/rock: 1.94 m
Event(s):
64PE-174P13 * Latitude: -29.761800 * Longitude: 2.401600 * Elevation: -2912.0 m * Recovery: 7.6 m * Location: Walvis Ridge * Method/Device: Piston corer (PC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Globigerinoides ruber sensu lato, δ18OG. ruber sl δ18O‰ PDBScussolini, Paolowith respect to VPDB
4Globorotalia truncatulinoides sinistral, δ18OG. truncatulinoides s δ18O‰ PDBScussolini, Paolowith respect to VPDB
5Globorotalia truncatulinoides sinistral, δ13CG. truncatulinoides s δ13C‰ PDBScussolini, Paolowith respect to VPDB
6Sea surface temperatureSST°CScussolini, PaoloCalculated from Mg/Ca ratios (Anand et al., 2003)Globigerinoides ruber s.l.
7Thermocline water temperatureTWT°CScussolini, PaoloCalculated from Mg/Ca ratios (Regenberg et al. 2009)Globorotalia truncatulinoides sin.
8δ18O, waterδ18O H2O‰ SMOWScussolini, PaoloCalculatedSea surface d18O, Globigerinoides ruber s.l. d18Osw-ivc, with respect to VSMOW
9δ18O, waterδ18O H2O‰ SMOWScussolini, PaoloCalculatedThermocline water d18O, Globorotalia truncatulinoides sin. d18Osw-ivc, with respect to VSMOW
Size:
561 data points

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