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 [dataset]. 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) * Method/Device: Piston corer (PC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Bahr, André | Geocode | |
| 2 | AGE | Age | ka BP | Bahr, André | Geocode | |
| 3 | Globigerinoides ruber, δ18O | G. ruber δ18O | ‰ PDB | Bahr, André | vs. VPDB | |
| 4 | δ18O, water | δ18O H2O | ‰ SMOW | Bahr, André | ivf-sw, vs. VPDB | |
| 5 | Globigerinoides ruber, δ13C | G. ruber δ13C | ‰ PDB | Bahr, André | vs. VPDB | |
| 6 | Globigerinoides ruber, Barium/Calcium ratio | G. ruber Ba/Ca | µmol/mol | Bahr, André | Ba138/Ca43 | |
| 7 | Globigerinoides ruber, Magnesium/Calcium ratio | G. ruber Mg/Ca | mmol/mol | Bahr, André | Mg25/Ca43 | |
| 8 | Sea surface temperature, annual mean | SST (1-12) | °C | Bahr, André | SST from Mg/Ca ratios | Mg25/Ca43 |
| 9 | Globigerinoides ruber, Aluminium/Calcium ratio | G. ruber Al/Ca | mmol/mol | Bahr, André | Al27/Ca44 | |
| 10 | Globigerinoides ruber, Manganese/Calcium ratio | G. ruber Mn/Ca | mmol/mol | Bahr, André | Mn55/Ca43 | |
| 11 | Globigerinoides ruber, Iron/Calcium ratio | G. ruber Fe/Ca | mmol/mol | Bahr, André | Fe57/Ca43 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1818 data points