Jacobel, Allison W; Costa, Kassandra M; Lynch-Stieglitz, Jean; Marchitto, Thomas M (2026): Trace Elements of sediment core ML1208-16BB from central equatorial Pacific [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.986846
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Published: 2026-01-23 • DOI registered: 2026-02-21
Abstract:
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.
Supplement to:
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
References:
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
Funding:
Coverage:
Latitude: 0.480000 * Longitude: -156.270000
Minimum DEPTH, sediment/rock: 0.025 m * Maximum DEPTH, sediment/rock: 0.765 m
Event(s):
ML1208-16BB * Latitude: 0.480000 * Longitude: -156.270000 * Elevation: -2926.0 m * Location: Central equatorial Pacific * Campaign: MGL2408 * Basis: Marcus G. Langseth * Method/Device: Gravity corer (GC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Depth, sediment/rock, top/minimum | Depth sed top | m | Jacobel, Allison W | ||
| 2 | Depth, sediment/rock, bottom/maximum | Depth sed bot | m | Jacobel, Allison W | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Jacobel, Allison W | Geocode | |
| 4 | Age model | Age model | ka | Jacobel, Allison W | see comment | Average. Statistically constrained with 14C and 18O via tuning to the Ahn et al. (2017, doi:10.1093/climsys/dzx002) stack using BIGMACS (Lee at al. (2023, doi:10.1093/climsys/dzx002)); age model published by Jacobel et al. (2025, doi:10.5194/gchron-7-123-2025). |
| 5 | Age, uncertainty | Age unc | ± | Jacobel, Allison W | 1 sigma | |
| 6 | Cibicidoides wuellerstorfi, Boron/Calcium ratio | C. wuellerstorfi B/Ca | µmol/mol | Jacobel, Allison W | Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) | |
| 7 | Cibicidoides wuellerstorfi, Boron/Calcium ratio, uncertainty | C. wuellerstorfi B/Ca unc | ± | Jacobel, Allison W | Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) | 1 sigma |
| 8 | Cibicidoides wuellerstorfi, carbonate saturation state | C. wuellerstorfi, ∆[CO3]2- | Jacobel, Allison W | Calculated according to Yu and Elderfield (2007) | ||
| 9 | Cibicidoides wuellerstorfi, carbonate saturation state, uncertainty | C. wuellerstorfi ∆[CO3]2- unc | ± | Jacobel, Allison W | Calculated according to Yu and Elderfield (2007) | 1 sigma (using the analytical uncertainty and uncertainty in the calibration constants). |
| 10 | Cibicidoides wuellerstorfi, Manganese/Calcium ratio | C. wuellerstorfi Mn/Ca | µmol/mol | Jacobel, Allison W | Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) | |
| 11 | Cibicidoides wuellerstorfi, Aluminium/Calcium ratio | C. wuellerstorfi Al/Ca | µmol/mol | Jacobel, Allison W | Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) | |
| 12 | Cibicidoides wuellerstorfi, Iron/Calcium ratio | C. wuellerstorfi Fe/Ca | µmol/mol | Jacobel, Allison W | Inductively coupled plasma - mass spectrometry (ICP-MS), Thermo Finnigan, Element 2 followed by Marchitto (2006) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
374 data points