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Bahr, André; Hoffmann, Julia; Schönfeld, Joachim; Schmidt, Matthew W; Nürnberg, Dirk; Batenburg, Sietske J; Voigt, Silke (2017): Geochemistry of Globigerinoides ruber of sediment core M78/1_235-1. PANGAEA, https://doi.org/10.1594/PANGAEA.882352, Supplement to: Bahr, A et al. (2018): Low-latitude expressions of high-latitude forcing during Heinrich Stadial 1 and the Younger Dryas in northern South America. Global and Planetary Change, 160, 1-9, https://doi.org/10.1016/j.gloplacha.2017.11.008

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Abstract:
Changes in Atlantic Meridional Overturning Circulation (AMOC) strength exert a major influence on global atmospheric circulation patterns. However, the pacing and mechanisms of low-latitude responses to high-latitude forcing are insufficiently constrained so far. To elucidate the interaction of atmospheric and oceanic forcing in tropical South America dur-ing periods of major AMOC reductions (Heinrich Stadial 1 and the Younger Dryas) we gen-erated a high-resolution foraminiferal multi-proxy record from off the Orinoco River based on Ba/Ca and Mg/Ca ratios, as well as stable isotope measurements. The data clearly indi-cate a three-phased structure of HS1 based on the reconfiguration of ocean currents in the tropical Atlantic Ocean. The initial phase (HS1a) is characterized by a diminished North Brazil Current, a southward displacement of the ITCZ, and moist conditions dominating northeastern Brazil. During subsequent HS1b, the NBC was even more diminished or yet reversed and the ITCZ shifted to its southernmost position. Hence, dryer conditions pre-vailed in northern South America, while eastern Brazil experienced maximally wet condi-tions. During the final stage, HS1c, conditions are similar to HS1a. The YD represents a smaller amplitude version of HS1 with a southward-shifted ITCZ. Our findings imply that the low-latitude continental climate response to high-latitude forcing is mediated by recon-figurations of surface ocean currents in low latitudes. Our new records demonstrate the ex-treme sensitivity of the terrestrial realm in tropical South America to abrupt perturbations in oceanic circulation during periods of unstable climate conditions.
Coverage:
Latitude: 11.608833 * Longitude: -60.964333
Date/Time Start: 2009-03-22T14:54:00 * Date/Time End: 2009-03-22T14:54:00
Minimum DEPTH, sediment/rock: 1.74 m * Maximum DEPTH, sediment/rock: 4.23 m
Event(s):
M78/1_235-1 (235-1) * Latitude: 11.608833 * Longitude: -60.964333 * Date/Time: 2009-03-22T14:54:00 * Elevation: -852.2 m * Location: N. Tobago * Campaign: M78/1 * Basis: Meteor (1986) * Device: Piston corer (PC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmBahr, AndréGeocode
2AGEAgeka BPBahr, AndréGeocode
3Globigerinoides ruber, δ18OG. ruber δ18O‰ PDBBahr, Andrévs. VPDB
4δ18O, waterδ18O H2O‰ SMOWBahr, Andréivf-sw, vs. VPDB
5Globigerinoides ruber, δ13CG. ruber δ13C‰ PDBBahr, Andrévs. VPDB
6Globigerinoides ruber, Barium/Calcium ratioG. ruber Ba/Caµmol/molBahr, AndréBa138/Ca43
7Globigerinoides ruber, Magnesium/Calcium ratioG. ruber Mg/Cammol/molBahr, AndréMg25/Ca43
8Sea surface temperature, annual meanSST (1-12)°CBahr, AndréSST from Mg/Ca ratiosMg25/Ca43
9Globigerinoides ruber, Aluminium/Calcium ratioG. ruber Al/Cammol/molBahr, AndréAl27/Ca44
10Globigerinoides ruber, Manganese/Calcium ratioG. ruber Mn/Cammol/molBahr, AndréMn55/Ca43
11Globigerinoides ruber, Iron/Calcium ratioG. ruber Fe/Cammol/molBahr, AndréFe57/Ca43
Size:
1818 data points

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