Southern Ocean convection amplified past Antarctic warming and atmospheric CO2 rise during Heinrich Stadial 4

Barker, S. et al. 800,000 years of abrupt climate variability. Science 334, 347–351 (2011).

CAS  Article  Google Scholar 

Stocker, T. F. & Johnsen, S. J. A minimum thermodynamic model for the bipolar seesaw. Paleoceanography 18, PA1087 (2003).

Article  Google Scholar 

Wais Divide Project Members et al. Precise interpolar phasing of abrupt climate change during the last ice age. Nature 520, 661, https://doi.org/10.1038/nature14401 (2015).

CAS  Article  Google Scholar 

EPICA community members. One-to-one coupling of glacial variability in Greenland and Antarctica. Nature 444, 195–198 (2006).

Article  Google Scholar 

Barker, S. et al. Interhemispheric Atlantic seesaw response during the last deglaciation. Nature 457, 1097–1102 (2009).

CAS  Article  Google Scholar 

Schmittner, A., Saenko, O. A. & Weaver, A. J. Coupling of the hemispheres in observations and simulations of glacial climate change. Quat. Sci. Rev. 22, 659–671 (2003).

Article  Google Scholar 

Seidov, D. & Maslin, M. Atlantic Ocean heat piracy and the bipolar climate see-saw during Heinrich and Dansgaard-Oeschger events. J Quat. Sci. 16, 321–328 (2001).

Article  Google Scholar 

Pedro, J. B. et al. Beyond the bipolar seesaw: toward a process understanding of interhemispheric coupling. Quat. Sci. Rev. 192, 27–46, https://doi.org/10.1016/j.quascirev.2018.05.005 (2018).

Article  Google Scholar 

Kageyama, M. et al. Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study. Clim. Past 9, 935–953 (2013).

Article  Google Scholar 

Stouffer, R. et al. Investigating the causes of the response of the thermohaline circulation to past and future climate changes. J. Clim. 19, 1365–1387 (2006).

Article  Google Scholar 

Ganopolski, A. & Rahmstorf, S. Rapid changes of glacial climate simulated in a coupled climate model. Nature 409, 153–158 (2001).

CAS  Article  Google Scholar 

Menviel, L., Spence, P. & England, M. H. Contribution of enhanced Antarctic Bottom Water formation to Antarctic warm events and millennial-scale atmospheric CO₂ increase. Earth Planet. Sci. Lett. 413, 37–50, https://doi.org/10.1016/j.epsl.2014.12.050 (2015).

CAS  Article  Google Scholar 

Hemming, S. R. Heinrich events: massive late pleistocene detritus layers of the North Atlantic and their global climate imprint. Rev. Geophys. 42, 1–43 (2004).

Article  Google Scholar 

Henry, L. G. et al. North Atlantic ocean circulation and abrupt climate change during the last glaciation. Science 353, 470–474, https://doi.org/10.1126/science.aaf5529 (2016).

CAS  Article  Google Scholar 

Skinner, L. C. & Elderfield, H. Rapid fluctuations in the deep North Atlantic heat budget during the last glaciation. Paleoceanography 22, PA1205 (2007).

Article  Google Scholar 

Skinner, L. C., Shackleton, N. J. & Elderfield, H. Millennial-scale variability of deep-water temperature and d18Odw indicating deep-water source variations in the Northeast Atlantic, 0–34 cal. ka BP. Geochem. Geophys. Geosys. 4, 1–17 (2003).

Article  Google Scholar 

Weldeab, S., Friedrich, T., Timmermann, A. & Schneider, R. R. Strong middepth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas. Paleoceanography 31, 1070–1082, https://doi.org/10.1002/2016pa002957 (2016).

Article  Google Scholar 

Repschläger, J., Weinelt, M., Andersen, N., Garbe-Schönberg, D. & Schneider, R. Northern source for Deglacial and Holocene deepwater composition changes in the Eastern North Atlantic Basin. Earth Planet. Sci. Lett. 425, 256–267, https://doi.org/10.1016/j.epsl.2015.05.009 (2015).

CAS  Article  Google Scholar 

Marcott, S. A. et al. Ice-shelf collapse from subsurface warming as a trigger for Heinrich events. Proc. Natl Acad. Sci. USA 108, 13415–13419, https://doi.org/10.1073/pnas.1104772108 (2011).

Article  Google Scholar 

Weldeab, S., Arce, A. & Kasten, S. Mg/Ca- CO2⁻-temperature calibration for Globobulimina spp.: a sensitive paleothermometer for deep-sea temperature reconstruction. Earth Planet. Sci. Lett. 438, 95–102 (2016).

CAS  Article  Google Scholar 

Roberts, J. et al. Evolution of South Atlantic density and chemical stratification across the last deglaciation. Proc. Natl Acad. Sci. USA, 1–6, http://www.pnas.org/cgi/doi/10.1073/pnas.1511252113 (2016).

Bryan, S. & Marchitto, T. Mg/Ca-temperature proxy in benthic foraminifera: new calibrations from the Florida Straits and a hypothesis regarding Mg/Li. Paleoceanography 23 (2008).

Elderfield, H., Yu, J., Anand, P., Keifer, T. & Nyland, B. Calibrations for benthic foraminiferal Mg/Ca palaeothermometry and the carbonate ion hypothesis. Earth Planet. Sci. Lett. 250, 633–649 (2006).

CAS  Article  Google Scholar 

de Lavergne, C., Palter, J. B., Galbraith, E. D., Bernardello, R. & Marinov, I. Cessation of deep convection in the open Southern Ocean under anthropogenic climate change. Nat. Clim. Change 4, 278–282, https://doi.org/10.1038/nclimate2132 (2014).

Article  Google Scholar 

Gottschalk, J. et al. Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard-Oeschger events. Nat. Geosci. 8, 950–954, https://doi.org/10.1038/ngeo2558 (2015).

CAS  Article  Google Scholar 

Stocker, T. F., Timmermann, A., Renold, M. & Timm, O. Effects of salt compensation on the climate model response in simulations of large changes of the Atlantic Meridional Overturning Circulation. J. Clim. 20, 5912–5928 (2007).

Article  Google Scholar 

Schmittner, A., Brook, E. J. & Ahn, J. In Ocean circulation: mechanisms and impacts (eds A. Schmittner A. et al.) 315–334 (AGU Monograph, 2007).

Schmittner, A. & Galbraith, E. Glacial greenhouse-gas fluctuations controlled by ocean circulation changes. Nature 456, 373–376 (2008).

CAS  Article  Google Scholar 

Buizert, C. et al. Abrupt ice-age shifts in southern westerly winds and Antarctic climate forced from the north. Nature 563, 681–685, https://doi.org/10.1038/s41586-018-0727-5 (2018).

CAS  Article  Google Scholar 

Menviel, L. et al. Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO₂ rise. Nature Communications 9, 2503, https://doi.org/10.1038/s41467-018-04876-4 (2018).

CAS  Article  Google Scholar 

Gottschalk, J. et al. Mechanisms of millennial-scale atmospheric CO₂ change in numerical model simulations. Quat. Sci. Rev. 220, 30–74, https://doi.org/10.1016/j.quascirev.2019.05.013 (2019).

Article  Google Scholar 

Galbraith, E. D., Merlis, T. M. & Palter, J. B. Destabilization of glacial climate by the radiative impact of Atlantic Meridional Overturning Circulation disruptions. Geophys. Res. Lett. 43, 8214–8221, https://doi.org/10.1002/2016GL069846 (2016).

Article  Google Scholar 

Broecker, W. S. Palaeocean circulation during the last deglaciation: a bipolar seesaw? Paleoceanography 13, 119–121 (1998).

Article  Google Scholar 

Skinner, L. C., Waelbroeck, C., Scrivner, A. & Fallon, S. Radiocarbon evidence for alternating northern and southern sources of ventilation of the deep Atlantic carbon pool during the last deglaciation. Proc. Natl Acad. Sci. USA 111, 5480–5484, http://www.pnas.org/cgi/doi/10.1073/pnas.1400668111 (2014).

CAS  Article  Google Scholar 

Brown, N. & Galbraith, E. D. Hosed vs. unhosed: interruptions of the Atlantic Meridional Overturning Circulation in a global coupled model, with and without freshwater forcing. Clim. Past 12, 1663–1679, https://doi.org/10.5194/cp-12-1663-2016 (2016).

Article  Google Scholar 

Barker, S. et al. Icebergs not the trigger for North Atlantic cold events. Nature 520, 333–338 (2015).

CAS  Article  Google Scholar 

Gottschalk, J. et al. Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nat. Commun. 7, 11539, https://doi.org/10.1038/ncomms11539 (2016).

CAS  Article  Google Scholar 

Jaccard, S. L., Galbraith, E. D., Martínez-García, A. & Anderson, R. F. Covariation of deep Southern Ocean oxygenation and atmospheric CO₂ through the last ice age. Nature 530, 207–210, https://doi.org/10.1038/nature16514 (2016).

CAS  Article  Google Scholar 

Thompson, A. F., Hines, S. K. V. & Adkins, J. F. A Southern Ocean mechanism for the interhemispheric coupling and phasing of the bipolar seesaw. J Clim. 32, 4347–4365 (2019).

Article  Google Scholar 

Hines, S. K. V., Thompson, A. F. & Adkins, J. F. The role of the Southern Ocean in abrupt transitions and hysteresis in glacial ocean circulation. Paleoceanogr. Paleoclimatol. 34, 490–510, https://doi.org/10.1029/2018pa003415 (2019).

Article  Google Scholar 

Skinner, L. C., Muschitiello, F. & Scrivner, A. E. Marine reservoir age variability over the last deglaciation: implications for marine carboncycling and prospects for regional radiocarbon calibrations. Paleoceanogr. Paleoclimatol. 34, 1807–1815, https://doi.org/10.1029/2019pa003667 (2019).

Article  Google Scholar 

Baggenstos, D. et al. Earth’s radiative imbalance from the Last Glacial Maximum to the present. Proc. Natl Acad. Sci. USA 116, 14881–14886, https://doi.org/10.1073/pnas.1905447116 (2019).

CAS  Article  Google Scholar 

Bereiter, B., Shackleton, S., Baggenstos, D., Kawamura, K. & Severinghaus, J. Mean global ocean temperatures during the last glacial transition. Nature 553, 39–44 (2018).

CAS  Article  Google Scholar 

Boiteau, R., Greaves, M. & Elderfield, H. Authigenic uranium in foraminiferal coatings: a proxy for ocean redox chemistry. Paleoceanography 27, https://doi.org/10.1029/2012pa002335 (2012).

Klinkhammer, G. & Palmer, M. R. Uranium in the oceans: where it goes and why. Geochim. Cosmochim. Acta 55, 1799–1806 (1991).

CAS  Article  Google Scholar 

Skinner, L. et al. Rare earth elements in the service of palaeoceanography: a novel microanalysis approach. Geochim. Cosmochim. Acta 245, 118–132 (2019).

CAS  Article  Google Scholar 

Barker, S., Greaves, M. & Elderfield, H. A study of cleaning procedures used for foraminiferal Mg/Ca paleothermometry. Geochem. Geophys. Geosys. 4, 84078 (2003).

Article  Google Scholar 

Yu, J., Day, J. A., Greaves, M. J. & Elderfield, H. Determination of multiple element/calcium ratios in foraminiferal calcite by quadrupole ICP-MS. Geochem. Geophys. Geosys. 6, Q08P01 (2005).

Article  Google Scholar 

Locarnini, R. A. et al. NOAA Atlas NESDIS Vol. 73 (eds Levitus S. & Mishonov, A. V.) (Maryland Ocean Climate Laboratory, 2013).

Garcia, H. E. et al. In NOAA Atlas NESDIS Vol. 75 (eds Levitus S. & Mishonov A. V.) 27 (U.S Government Printing Office, 2004).

Svensson, A. et al. A 60,000 year Greenland stratigraphic ice core chronology. Clim. Past 4, 47–57 (2008).

Article  Google Scholar