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Main Authors: de Carvalho Campos, Marília, Nascimento, Rodrigo Azevedo, Pinho, Tainã Marcos Lima, Kraft, Laura, Crivellari, Stefano, Radionovskaya, Svetlana, Skinner, Luke C, Dias, Bruna Borba, Portilho-Ramos, Rodrigo Costa, Hartmann, Gelvam André, Baker, Paul A, Cleverson, Silva G, Sawakuchi, André Oliveira, Chiessi, Cristiano Mazur
Format: Dataset Open Access
Language:en
Published: PANGAEA 2026
Subjects:
AGE; AWI_INSPIRES; Calculated, see Comment; CDH-89; Core; CORE; DEPTH, sediment/rock; Difference; Equatorial Atlantic; Foraminifera; Globigerinoides ruber white sensu stricto, δ18O; Inductively coupled plasma-optical emission spectrometry (ICP-OES), Agilent, 5100; International Science Program for Integrative Research in Earth Systems; Isotope Ratio mass spectrometer, Thermo Fisher Scientific, ThermoScientific, MAT 253; ITCZ; Neogloboquadrina dutertrei, Magnesium/Calcium ratio; Neogloboquadrina dutertrei, δ18O; Ratio; Relative abundance (counted and calculated of >125 µm fraction); Stratification; Temperature, water; δ18O, seawater, reconstructed
Online Access:https://doi.org/10.1594/PANGAEA.989599
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Table of Contents:
  • We apply a multi-proxy approach to marine sediment core CDH-89 (western equatorial Atlantic, WEA) to investigate ITCZ variability during the penultimate deglaciation. Planktonic foraminiferal assemblages were used to calculate the RN/Gg ratio, defined as %Neogloboquadrina / (%Neogloboquadrina + %Globigerina glutinata), providing insights into upper-ocean structure. We further reconstructed surface hydrography using a suite of oxygen-isotope–based proxies, including Neogloboquadrina dutertrei δ¹⁸O, Globigerinoides ruber (white, sensu stricto) δ¹⁸O, and the interspecies gradient Δδ¹⁸O (N. dutertrei – G. ruber). In addition, we estimated seawater isotopic composition (δ¹⁸O_SW) for both species (N. dutertrei δ¹⁸O_SW and G. ruber δ¹⁸O_SW), as well as the interspecies difference Δδ¹⁸O_SW (N. dutertrei – G. ruber), to infer past salinity variations. Sea-surface temperature was reconstructed using N. dutertrei Mg/Ca-derived calcification temperatures, and we calculated the interspecies temperature gradient ΔTemperature (N. dutertrei – G. ruber) to provide additional constraints on upper-ocean thermal structure.

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