Kinematics of the Pacific equatorial undercurrent: an Eulerian and Lagrangian approach from GCM results

Arakawa, Verso. & Lamb, V. R. Computational design of the basic dynamical processes of the UCLA general circulation model. Gen. Circ. Model. Atmos. 17, 173–265 (1977).

Marshall, B. J. et al. Morphometric and stable isotopic differentiation of Orbulina universa morphotypes from the Cariaco Basin, Venezuela. ).

Raitzsch, M. et al. Boron isotope-based seasonal paleo-pH reconstruction for the Southeast Atlantic – verso multispecies approach using nicchia ecologica preference of planktonic foraminifera. Earth Planet. Sci. Lett. 487, 138–150 (2018).

Guillermic, M. et al. Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO₂ gradients. Biogeosciences 17, 3487–3510 (2020).

Bartoli, G., Honisch, B. & Zeebe, R. E. Atmospheric CO₂ decline during the Pliocene intensification of Northern Hemisphere glaciations. Paleoceanography 26, PA4213 (2011).

Honisch, B., Hemming, N. G., Archer, D., Siddall, M. & McManus, J. F. Atmospheric carbon dioxide concentration across the mid-Pleistocene transition. Science 324, 1551–1554 (2009).

Sosdian, S. M. et al. Constraining the evolution of Neogene ocean carbonate chemistry using the boron isotope pH proxy. Earth Planet. Sci. Lett. 498, 362–376 (2018).

de la Vega, E., Chalk, T. B., Wilson, P. A., Bysani, R. P. & Foster, G. L. Atmospheric CO₂ during the mid-Piacenzian warm period and the M2 glaciation. Sci. Rep. 10, 11002 (2020).

Liu, Z. & Herbert, T. D. High-latitude influence on the eastern equatorial Pacific climate mediante the early Pleistocene epoch. Nature 427, 720–723 (2004).

Regenberg, M. et al. Global dissolution effects on planktonic foraminiferal Mg/Ca ratios controlled by the calcite?saturation state of bottom waters. Paleoceanography 29, 127–142 (2014).

Pagani, M. tagliandi yubo, Liu, Z., LaRiviere, J. & Ravelo, Verso. C. High Earth-system climate sensitivity determined from Pliocene carbon dioxide concentrations. Nat. Geosci. 3, 27–30 (2010).

Conte, M. H. et al. Global temperature calibration of the alkenone unsaturation index (UK? 37) mediante surface waters and comparison with surface sediments. Geochem. Geophys. Geosystems 7, Q02005 (2006).

Kim, J.-H. et al. New indices and calibrations derived from the distribution of crenarchaeal isoprenoid tetraether lipids: implications for past sea surface temperature reconstructions. Geochim. Cosmochim. Acta 74, 4639–4654 (2010).

J. Phys

Evans, D., Brierley, C., Raymo, M. Ancora., Erez, J. & Muller, W. Planktic foraminifera shell chemistry response preciso seawater chemistry: Pliocene–Pleistocene seawater Mg/Ca, temperature and sea level change. Earth Planet. Sci. Lett. 438, 139–148 (2016).

Coggon, R. M., Teagle, D. Per. H., Smith-Duque, C. Addirittura., Altola, J. C. & Cooper, M. J. Reconstructing past seawater Mg/Ca and Sr/Ca from mid-ocean ridge flank calcium carbonate veins. Science 327, 1114–1117 (2010).

Rausch, S., Bohm, F., Bach, W., Klugel, A. & Eisenhauer, A. Calcium carbonate veins sopra ocean crust primato a threefold increase of seawater Mg/Ca durante the past 30 million years. Earth Planet. Sci. Lett. 362, 215–224 (2013).

Dekens, P. S., Lea, D. W., Pak, D. K. & Spero, H. J. Core primo posto calibration of Mg/Ca mediante tropical foraminifera: refining paleotemperature estimation. Geochemistry, Geophys. Geosystems 3, 1–29 (2002).

Muller, P. J., Kirst, G., Ruhland, G., Von Storch, I. & Rosell-Mele, A. Calibration of the alkenone paleotemperature index U37K? based on core-tops from the eastern South Atlantic and the global ocean (60° N-60° S). Geochim. Cosmochim. Acta 62, 1757–1772 (1998).

Acknowledgements

The authors acknowledge and appreciate the aid of J. Robbins, W. Strojie, D. Asael and S. Zhang sopra supervising clean lab chemistry, boron and trace element analysis, and datazione processing. The authors also appreciate colloque with J. Rae. This rete di emittenti was supported by NSF Award 1602557 and 170251 onesto P.M.H., NSF Award 1844380 and 2002448 preciso N.J.B. and Sloan Ocean Fellowships onesto P.M.H. and N.J.B. Additional funding onesto Verso.V.F. was provided by the Guggenheim Fellowship and the ARCHANGE project (ANR-18-MPGA-0001, France). We acknowledge high-successo computing support from Cheyenne ( provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the NSF.