PANGAEA_986846 Trace Elements of sediment core ML1208-16BB from central equatorial Pacific Jacobel, Allison W; Costa, Kassandra M; Lynch-Stieglitz, Jean; Marchitto, Thomas M Trace Elements of sediment core ML1208-16BB from central equatorial Pacific 2026-01-23 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.986846 Investigator Allison W Jacobel Ajacobel@middlebury.edu Earth Science Depth, sediment/rock, top/minimum Depth, sediment/rock, bottom/maximum DEPTH, sediment/rock Age model Age, uncertainty Cibicidoides wuellerstorfi, Boron/Calcium ratio Cibicidoides wuellerstorfi, Boron/Calcium ratio, uncertainty Cibicidoides wuellerstorfi, carbonate saturation state Cibicidoides wuellerstorfi, carbonate saturation state, uncertainty Cibicidoides wuellerstorfi, Manganese/Calcium ratio Cibicidoides wuellerstorfi, Aluminium/Calcium ratio Cibicidoides wuellerstorfi, Iron/Calcium ratio geoscientificInformation B/Ca carbonate preservation Equatorial pacific ocean Gravity corer LGM MGL2408 ML1208-16BB trace metals see comment Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) Calculated according to Yu and Elderfield (2007) Marcus G. Langseth Complete 0.48 0.48 -156.27 -156.27 0.025 m (DEPTH, sediment/rock) 0.765 m (DEPTH, sediment/rock) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 374 data points text/tab-separated-values Jacobel, Allison W; Costa, Kassandra M; Lynch-Stieglitz, Jean; Marchitto, Thomas M (2025): Deep Pacific carbonate chemistry since the Last Glacial Maximum. Quaternary Science Reviews, 370, 109656, https://doi.org/10.1016/j.quascirev.2025.109656 Ahn, Seonmin; Khider, D; Lisiecki, Lorraine E; Lawrence, Charles E (2017): A probabilistic Pliocene–Pleistocene stack of benthic δ18O using a profile hidden Markov model. Dynamics and Statistics of the Climate System, 2(1), https://doi.org/10.1093/climsys/dzx002 Jacobel, Allison W; Costa, Kassandra M; Applebaum, Lily M; Conde, Serena (2025): New controls on sedimentation and climate in the central equatorial Pacific Ocean. Geochronology (GChron), 7(1), 123-138, https://doi.org/10.5194/gchron-7-123-2025 Lee, T; Rand, Devin S; Lisiecki, Lorraine E; Gebbie, Geoffrey; Lawrence, Charles E (2023): Bayesian age models and stacks: combining age inferences from radiocarbon and benthic δ 18 O stratigraphic alignment. Climate of the Past, 19(10), 1993-2012, https://doi.org/10.5194/cp-19-1993-2023 Marchitto, Thomas M (2006): Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS. Geochemistry, Geophysics, Geosystems, 7(5), 2005GC001018, https://doi.org/10.1029/2005GC001018 Yu, Jimin; Elderfield, Henry (2007): Benthic foraminiferal B/Ca ratios reflect deep water carbonate saturation state. Earth and Planetary Science Letters, 258(1-2), 73-86, https://doi.org/10.1016/j.epsl.2007.03.025

Quantitative constraints on deep ocean carbonate chemistry are critical for understanding the processes responsible for glacial-interglacial changes in atmospheric pCO2 and the ocean feedbacks that amplify carbon cycle change. Here, we present a new, millennially-resolved, B/Ca-based record of carbonate ion concentration (∆[CO32-]), measured on C. wullerstorfi, from central equatorial Pacific site ML1208-16BB spanning the last 35 ka. This site, bathed by Pacific Deep Water, reveals a ~24 ± 7 µmol/kg rise in deep ocean [CO32-] between ~20 and 10 ka, a larger change than previously reconstructed from sites in the western equatorial Pacific and those in the central equatorial Pacific bathed by Lower Circumpolar Deep Water. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.986846"!

https://doi.org/10.1016/j.epsl.2007.03.025 Benthic foraminiferal B/Ca ratios reflect deep water carbonate saturation state https://doi.org/10.1016/j.epsl.2007.03.025 Calculated according to Yu and Elderfield (2007) https://doi.org/10.1016/j.quascirev.2025.109656 Deep Pacific carbonate chemistry since the Last Glacial Maximum https://doi.org/10.1029/2005GC001018 Precise multielemental ratios in small foraminiferal samples determined by sector field ICP-MS https://doi.org/10.1093/climsys/dzx002 A probabilistic Pliocene–Pleistocene stack of benthic δ18O using a profile hidden Markov model https://doi.org/10.5194/cp-19-1993-2023 Bayesian age models and stacks: combining age inferences from radiocarbon and benthic δ 18 O stratigraphic alignment https://doi.org/10.5194/gchron-7-123-2025 New controls on sedimentation and climate in the central equatorial Pacific Ocean https://www.rvdata.us/search/cruise/MGL2408 MGL2408 DIF 9.4 2026-01-23 2026-07-15