Abstract
Earth’s climate cooled markedly during the late Miocene from 12 to 5 million years ago, with far-reaching consequences for global ecosystems. However, the driving forces of these changes remain controversial. A major obstacle to progress is the uncertainty over the role played by greenhouse gas radiative forcing. Here we present boron isotope compositions for planktic foraminifera, which record carbon dioxide change for the interval of most rapid cooling, the late Miocene cooling event between 7 and 5 Ma. Our record suggests that CO2 declined by some 100 ppm over this two-million-year-long interval to a minimum at approximately 5.9 Ma. Having accounted for non-CO2 greenhouse gasses and slow climate feedbacks, we estimate global mean surface temperature change for a doubling of CO2—equilibrium climate sensitivity—to be 3.9 °C (1.8–6.7 °C at 95% confidence) on the basis of comparison of our record of radiative forcing from CO2 with a record of global mean surface temperature change. We conclude that changes in CO2 and climate were closely coupled during the latest Miocene and that equilibrium climate sensitivity was within range of estimates for the late Pleistocene, other intervals of the Cenozoic and the twenty-first century as presented by the Intergovernmental Panel on Climate Change.
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Data availability
The experimental data are available at https://doi.org/10.5258/SOTON/D2258.
References
Arrhenius, P. S. On the influence of carbonic acid in the air upon the temperature of the ground. Lond. Edinb. Dublin Philos. Mag. J. Sci. 41, 237–276 (1896).
Bereiter, B. et al. Revision of the EPICA Dome C CO2 record from 800 to 600 kyr before present. Geophys. Res. Lett. 42, 542–549 (2015).
Anagnostou, E. et al. Changing atmospheric CO2 concentration was the primary driver of early Cenozoic climate. Nature 533, 380–384 (2016).
Knutti, R., Rugenstein, M. A. A. & Hegerl, G. C. Beyond equilibrium climate sensitivity. Nat. Geosci. 10, 727–736 (2017).
Goodwin, P. et al. Pathways to 1.5 °C and 2 °C warming based on observational and geological constraints. Nat. Geosci. 11, 102–107 (2018).
Caballero, R. & Huber, M. State-dependent climate sensitivity in past warm climates and its implications for future climate projections. Proc. Natl. Acad. Sci. USA 110, 14162–14167 (2013).
Köhler, P., de Boer, B., von der Heydt, A. S., Stap, L. B. & van de Wal, R. S. W. On the state dependency of the equilibrium climate sensitivity during the last 5 million years. Clim. Past 11, 1801–1823 (2015).
Köhler, P. et al. A state-dependent quantification of climate sensitivity based on paleodata of the last 2.1 million years. Paleoceanography 32, 1102–1114 (2017).
Rohling, E. J. et al. Making sense of palaeoclimate sensitivity. Nature 491, 683–691 (2012).
Sherwood, S. C. et al. An assessment of Earth’s climate sensitivity using multiple lines of evidence. Rev. Geophys. 58, e2019RG000678 (2020).
Stap, L. B., Köhler, P. & Lohmann, G. Including the efficacy of land ice changes in deriving climate sensitivity from paleodata. Earth System Dynamics 10, 333–345 (2019).
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).
Pagani, M., Arthur, M. A. & Freeman, K. H. Miocene evolution of atmospheric carbon dioxide. Paleoceanography 14, 273–292 (1999).
Pagani, M., Freeman, K. H. & Arthur, M. A. Late Miocene atmospheric CO2 concentrations and the expansion of C4 grasses. Science 285, 876–879 (1999).
LaRiviere, J. P. et al. Late Miocene decoupling of oceanic warmth and atmospheric carbon dioxide forcing. Nature 486, 97–100 (2012).
Herbert, T. D. et al. Late Miocene global cooling and the rise of modern ecosystems. Nat. Geosci. 9, 843–847 (2016).
Larsen, H. C. et al. Seven million years of glaciation in Greenland. Science 264, 952–955 (1994).
Carrapa, B., Clementz, M. & Feng, R. Ecological and hydroclimate responses to strengthening of the Hadley circulation in South America during the late Miocene cooling. Proc. Natl. Acad. Sci. USA 116, 9747–9752 (2019).
Feakins, S. J. et al. Miocene C4 grassland expansion as recorded by the Indus Fan. Paleoceanogr. Paleoclimatol. 6, e2020PA003856 (2020).
Tauxe, L. & Feakins, S. J. A re-assessment of the chronostratigraphy of late Miocene C3–C4 transitions. Paleoceanogr. Paleoclimatol. 35, e2020PA003857 (2020).
Holbourn, A. E. et al. Late Miocene climate cooling and intensification of southeast Asian winter monsoon. Nat. Commun. 9, 1584 (2018).
Drury, A. J., John, C. M. & Shevenell, A. E. Evaluating climatic response to external radiative forcing during the late Miocene to early Pliocene: new perspectives from eastern equatorial Pacific (IODP U1338) and North Atlantic (ODP 982) locations. Paleoceanography 31, 167–184 (2016).
Drury, A. J. et al. Deciphering the state of the late Miocene to early Pliocene equatorial Pacific. Paleoceanogr. Paleoclimatol. 33, 246–263 (2018).
Anagnostou, E. et al. Proxy evidence for state-dependence of climate sensitivity in the Eocene greenhouse. Nat. Commun. 11, 4436 (2020).
Badger, M. et al. Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels. Clim. Past 15, 539–554 (2019).
Zhang, Y. G., Pagani, M., Liu, Z., Bohaty, S. M. & DeConto, R. A 40-million-year history of atmospheric CO2. Philos. Trans. R. Soc. A 371, 20130096 (2013).
Tanner, T., Hernández‐Almeida, I., Drury, A. J., Guitián, J. & Stoll, H. Decreasing atmospheric CO2 during the late Miocene cooling. Paleoceanogr. Paleoclimatol. 35, e2020PA003925 (2020).
Stoll, H. M. et al. Upregulation of phytoplankton carbon concentrating mechanisms during low CO2 glacial periods and implications for the phytoplankton pCO2 proxy. Quat. Sci. Rev. 208, 1–20 (2019).
Cui, Y., Schubert, B. A. & Jahren, A. H. A 23 m.y. record of low atmospheric CO2. Geology 48, 888–892 (2020).
Hain, M. P., Foster, G. L. & Chalk, T. Robust Constraints on Past CO2 Climate Forcing From the Boron Isotope Proxy. Paleoceanogr. Paleoclimatol. 33, 1099–1115 (2018).
Greenop, R. et al. A record of Neogene seawater δ11B reconstructed from paired δ11B analyses on benthic and planktic foraminifera. Clim. Past 13, 149–170 (2017).
Greenop, R., Foster, G., A. Wilson, P. & Lear, C. Middle Miocene climate instability associated with high amplitude CO2 variability. Paleoceanography 29, 845–853 (2014).
Raitzsch, M. & Hönisch, B. Cenozoic boron isotope variations in benthic foraminifers. Geology 41, 591–594 (2013).
Cerling, T. E. et al. Global vegetation change through the Miocene/Pliocene boundary. Nature 389, 153–158 (1997).
Beerling, D. J. & Royer, D. L. Convergent Cenozoic CO2 history. Nat. Geosci. 4, 418–420 (2011).
Bolton, C. T. & Stoll, H. M. Late Miocene threshold response of marine algae to carbon dioxide limitation. Nature 500, 558–562 (2013).
Witkowski, C. R., Weijers, J. W. H., Blais, B., Schouten, S. & Damsté, J. S. S. Molecular fossils from phytoplankton reveal secular pCO2 trend over the Phanerozoic. Sci. Adv. 4, eaat4556 (2018).
Super, J. R. et al. North Atlantic temperature and pCO2 coupling in the early–middle Miocene. Geology 46, 519–522 (2018).
Lomax, B. H., Lake, J. A., Leng, M. J. & Jardine, P. E. An experimental evaluation of the use of Δ13C as a proxy for palaeoatmospheric CO2. Geochim. Cosmochim. Acta 247, 162–174 (2019).
Drury, A. J. et al. Late Miocene climate and time scale reconciliation: accurate orbital calibration from a deep-sea perspective. Earth Planet. Sci. Lett. 475, 254–266 (2017).
Bierman, P. R., Shakun, J. D., Corbett, L. B., Zimmerman, S. R. & Rood, D. H. A persistent and dynamic East Greenland Ice Sheet over the past 7.5 million years. Nature 540, 256–260 (2016).
Pérez, L. F., Nielsen, T., Knutz, P. C., Kuijpers, A. & Damm, V. Large-scale evolution of the central-east Greenland margin: new insights to the North Atlantic glaciation history. Glob. Planet. Change 163, 141–157 (2018).
Tierney, J. E. & Tingley, M. P. BAYSPLINE: a new calibration for the alkenone paleothermometer. Paleoceanogr. Paleoclimatol. 33, 281–301 (2018).
Müller, P. J., Kirst, G., Ruhland, G., von Storch, I. & Rosell-Melé, A. Calibration of the alkenone paleotemperature index UK37′ based on core-tops from the eastern South Atlantic and the global ocean (60° N–60° S). Geochim. Cosmochim. Acta 62, 1757–1772 (1998).
Sutton, R. T., Dong, B. & Gregory, J. M. Land/sea warming ratio in response to climate change: IPCC AR4 model results and comparison with observations. Geophys. Res. Lett. 34, L02701 (2007).
Haywood, A. M. et al. The Pliocene Model Intercomparison Project Phase 2: large-scale climate features and climate sensitivity. Climate 16, 2095–2123 (2020).
Farnsworth, A. et al. Climate sensitivity on geological timescales controlled by non-linear feedbacks and ocean circulation. Geophys. Res. Lett. 46, 9880–9889 (2020).
Dyez, K. A., Hönisch, B. & Schmidt, G. A. Early Pleistocene obliquity-scale pCO2 variability at 1.5 million years ago. Paleoceanogr. Paleoclimatol. 33, 1270–1291 (2018).
Heydt, A. S., von der Köhler, P., van de Wal, R. S. W. & Dijkstra, H. A. On the state dependency of fast feedback processes in (paleo) climate sensitivity. Geophys. Res. Lett. 41, 6484–6492 (2014).
Martínez-Botí, M. A. et al. Plio-Pleistocene climate sensitivity evaluated using high-resolution CO2 records. Nature 518, 49–54 (2015).
Snyder, C. W. Evolution of global temperature over the past two million years. Nature 538, 226–228 (2016).
Jansen, E., Sjøholm, J., Bleil, U. & Erichsen, J. A. in Geological History of the Polar Oceans: Arctic Versus Antarctic (eds Bleil, U. & Thiede, J.) 677–705 (Springer, 1990); https://doi.org/10.1007/978-94-009-2029-3_35
Bradshaw, C. D. et al. The relative roles of CO2 and palaeogeography in determining late Miocene climate: results from a terrestrial model–data comparison. Climate 8, 715–786 (2012).
Bradshaw, C. D., Lunt, D. J., Flecker, R. & Davies-Barnard, T. Disentangling the roles of late Miocene palaeogeography and vegetation—implications for climate sensitivity. Palaeogeogr. Palaeoclimatol. Palaeoecol. 417, 17–34 (2015).
Knorr, G., Butzin, M., Micheels, A. & Lohmann, G. A warm Miocene climate at low atmospheric CO2 levels. Geophys. Res. Lett. 38, L200701 (2011).
Pound, M. J., Haywood, A. M., Salzmann, U. & Riding, J. B. Global vegetation dynamics and latitudinal temperature gradients during the mid to late Miocene (15.97–5.33Ma). Earth Sci. Rev. 112, 1–22 (2012).
Capella, W. et al. Mediterranean isolation preconditioning the Earth system for late Miocene climate cooling. Sci. Rep. 9, 3795 (2019).
Köhler, P. et al. What caused Earth’s temperature variations during the last 800,000 years? Data-based evidence on radiative forcing and constraints on climate sensitivity. Quat. Sci. Rev. 29, 129–145 (2010).
Hansen, J., Sato, M., Russell, G. & Kharecha, P. Climate sensitivity, sea level and atmospheric carbon dioxide. Philos. Trans. R. Soc. A 371, 117 (2013).
Hopcroft, P. O. et al. Polar amplification of Pliocene climate by elevated trace gas radiative forcing. Proc. Natl. Acad. Sci. USA 117, 23401–23407 (2020).
Zachos, J., Pagani, M., Sloan, L., Thomas, E. & Billups, K. Trends, rhythms, and aberrations in global climate 65 Ma to present. Science 292, 686–693 (2001).
Badger, M. P. S., Schmidt, D. N., Mackensen, A. & Pancost, R. D. High-resolution alkenone palaeobarometry indicates relatively stable pCO2 during the Pliocene (3.3–2.8 Ma). Philos. Trans. R. Soc. A 371, 20130094 (2013).
Freeman, K. H. & Hayes, J. M. Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2 levels. Glob. Biogeochem. Cycles 6, 185–198 (1992).
Seki, O. et al. Alkenone and boron-based Pliocene pCO2 records. Earth Planet. Sci. Lett. 292, 201–211 (2010).
Zhang, Y. G., Pagani, M., Henderiks, J. & Ren, H. A long history of equatorial deep-water upwelling in the Pacific Ocean. Earth Planet. Sci. Lett. 467, 1–9 (2017).
Pagani, M., Zachos, J. C., Freeman, K. H., Tipple, B. & Bohaty, S. Marked decline in atmospheric carbon dioxide concentrations during the Paleogene. Science 309, 600–603 (2005).
Chalk, T. B. et al. Causes of ice age intensification across the mid-Pleistocene transition. Proc. Natl Acad. Sci. USA 114, 13114–13119 (2017).
Bartoli, G., Hönisch, B. & Zeebe, R. E. Atmospheric CO2 decline during the Pliocene intensification of Northern Hemisphere glaciations. Paleoceanography 26, PA4213 (2011).
Foster, G. L., Lear, C. H. & Rae, J. W. The evolution of pCO2, ice volume and climate during the middle Miocene. Paleoceanography 341, 243–254 (2012).
Raitzsch, M. et al. Atmospheric carbon dioxide variations across the middle Miocene climate transition. Climate 17, 703–719 (2021).
Stap, L. B. et al. CO2 over the past 5 million years: continuous simulation and new δ11B-based proxy data. Earth Planet. Sci. Lett. 439, 1–10 (2016).
Hönisch, 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).
Da, J., Zhang, Y. G., Wang, H., Balsam, W. & Ji, J. An early Pleistocene atmospheric CO2 record based on pedogenic carbonate from the Chinese loess deposits. Earth Planet. Sci. Lett. 426, 69–75 (2015).
Da, J., Zhang, Y. G., Li, G., Meng, X. & Ji, J. Low CO2 levels of the entire Pleistocene epoch. Nat. Commun. 10, 4342 (2019).
Ekart, D. D., Cerling, T. E., Montanez, I. P. & Tabor, N. J. A 400 million year carbon isotope record of pedogenic carbonate: implications for paleoatmospheric carbon dioxide. Am. J. Sci. 299, 805–827 (1999).
Ji, S. et al. A symmetrical CO2 peak and asymmetrical climate change during the middle Miocene. Earth Planet. Sci. Lett. 499, 134–144 (2018).
Retallack, G. J. Refining a pedogenic-carbonate CO2 paleobarometer to quantify a middle Miocene greenhouse spike. Palaeogeogr. Palaeoclimatol. Palaeoecol. 281, 57–65 (2009).
Kürschner, W. M., van der Burgh, J., Visscher, H. & Dilcher, D. L. Oak leaves as biosensors of late Neogene and early Pleistocene paleoatmospheric CO2 concentrations. Mar. Micropaleontol. 27, 299–312 (1996).
Kürschner, W. M., Kvaček, Z. & Dilcher, D. L. The impact of Miocene atmospheric carbon dioxide fluctuations on climate and the evolution of terrestrial ecosystems. Proc. Natl. Acad. Sci. USA 105, 449–453 (2008).
Retallack, G. J. Greenhouse crises of the past 300 million years. Geol. Soc. Am. Bull. 121, 1441–1455 (2009).
Franks, P. J., Royer, D. L., Beerling, D. J., Van de Water, P. K., Cantrill, D. J., Barbour, M. M. & Berry, J. A. New constraints on atmospheric CO2 concentration for the Phanerozoic. Geophys. Res. Lett. 41, 4685–4694 (2014).
Royer, D. L., Wing, S. L., Beerling, D. J., Jolley, D. W., Koch, P. L., Hickey, L. J. & Berner, R. A. Paleobotanical evidence for near present-day levels of atmospheric CO2 during part of the Tertiary. Science 292, 2310–2313 (2001).
Steinthorsdottir, M., Jardine, P. E. & Rember, W. C. Near-future pCO2 during the hot Miocene climatic optimum. Paleoceanogr. and Paleoclimatol. 36, e2020PA003900 (2021).
Bickert, T., Haug, G. H. & Tiedemann, R. Late Neogene benthic stable isotope record of Ocean Drilling Program Site 999: implications for Caribbean paleoceanography, organic carbon burial, and the Messinian salinity crisis. Paleoceanography 19, PA1023 (2004).
Shackleton, N. J., Hall, M. A. & Boersma, A. Oxygen and carbon isotope data from Leg-74 foraminifers. Initial Rep. Deep Sea Drill. Proj. 74, 599–612 (1984).
Quade, J. & Cerling, T. E. Expansion of C4 grasses in the late Miocene of northern Pakistan: evidence from stable isotopes in paleosols. Palaeogeogr. Palaeoclimatol. Palaeoecol. 115, 91–116 (1995).
Lawrence, K. T., Liu, Z. & Herbert, T. D. Evolution of the eastern tropical Pacific through Plio-Pleistocene glaciation. Science 312, 79–83 (2006).
Liu, Z. & Herbert, T. D. High-latitude influence on the eastern equatorial Pacific climate in the early Pleistocene epoch. Nature 427, 720–723 (2004).
Liu, J. et al. Eastern equatorial Pacific cold tongue evolution since the late Miocene linked to extratropical climate. Sci. Adv. 5, eaau6060 (2019).
Steinke, S., Groeneveld, J., Johnstone, H. & Rendle-Bühring, R. East Asian summer monsoon weakening after 7.5 Ma: evidence from combined planktonic foraminifera Mg/Ca and δ18O (ODP Site 1146; northern South China Sea). Palaeogeogr. Palaeoclimatol. Palaeoecol. 289, 33–43 (2010).
Lederer, W. & Seibold, H. simex: SIMEX- And MCSIMEX-Algorithm for Measurement Error Models. R package version 1.8.https://CRAN.R-project.org/package=simex. (2019)
Cox, P. M., Huntingford, C. & Williamson, M. S. Emergent constraint on equilibrium climate sensitivity from global temperature variability. Nature 553, 319–322 (2018).
Chylek, P. & Lohmann, U. Aerosol radiative forcing and climate sensitivity deduced from the Last Glacial Maximum to Holocene transition. Geophys. Res. Lett. 35, L04804 (2008).
Hargreaves, J. C., Annan, J. D., Yoshimori, M. & Abe-Ouchi, A. Can the Last Glacial Maximum constrain climate sensitivity? Geophys. Res. Lett. 39, L24702 (2012).
Holden, P. B., Edwards, N. R., Oliver, K. I. C., Lenton, T. M. & Wilkinson, R. D. A probabilistic calibration of climate sensitivity and terrestrial carbon change in GENIE-1. Clim. Dyn. 35, 785–806 (2010).
Knutti, R. & Hegerl, G. C. The equilibrium sensitivity of the Earth’s temperature to radiation changes. Nat. Geosci. 1, 735–743 (2008).
Schmittner, A. et al. Climate sensitivity estimated from temperature reconstructions of the Last Glacial Maximum. Science 334, 1385–1388 (2011).
Schneider von Deimling, T., Held, H., Ganopolski, A. & Rahmstorf, S. Climate sensitivity estimated from ensemble simulations of glacial climate. Clim. Dyn. 27, 149–163 (2006).
Lea, D. W. The 100 000-yr cycle in tropical SST, greenhouse forcing, and climate sensitivity. J. Clim. 17, 2170–2179 (2004).
Hargreaves, J. C. & Annan, J. D. Could the Pliocene constrain the equilibrium climate sensitivity? Clim. Past 12, 1591–1599 (2016).
Pagani, M. et al. The role of carbon dioxide during the onset of Antarctic glaciation. Science 334, 1261–1264 (2011).
Lunt, D. J. et al. Earth system sensitivity inferred from Pliocene modelling and data. Nat. Geosci. 3, 60–64 (2010).
van de Wal, R. S. W., de Boer, B., Lourens, L. J., Köhler, P. & Bintanja, R. Reconstruction of a continuous high-resolution CO2 record over the past 20 million years. Clim. Past 7, 1459–1469 (2011).
Inglis, G. N. et al. Global mean surface temperature and climate sensitivity of the early Eocene Climatic Optimum (EECO), Paleocene–Eocene Thermal Maximum (PETM), and latest Paleocene. Climate 16, 1953–1968 (2020).
Royer, D. L., Berner, R. A. & Park, J. Climate sensitivity constrained by CO2 concentrations over the past 420 million years. Nature 446, 530–532 (2007).
Skinner, L. A long view on climate sensitivity. Science 337, 917–919 (2012).
Cramwinckel, M. J. et al. Synchronous tropical and polar temperature evolution in the Eocene. Nature 559, 382–386 (2018).
Takahashi, T., Sutherland, S. C., & Kozyr, A. Global Ocean Surface Water Partial Pressure of CO2 Database: Measurements Performed During 1957-2010 (Version 2010). ORNL/CDIAC-159, NDP-088(V2010). Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, https://cdiac.ess-dive.lbl.gov/ftp/ndp088/NDP-088.pdf (2010).
Foster, G. L. Seawater pH, pCO2 and [CO32-] variations in the Caribbean Sea over the last 130 kyr: A boron isotope and B/Ca study of planktic foraminifera. Earth Planet. Sci. Lett. 271, 254–266 (2008).
Zeeden, C. et al. Revised Miocene splice, astronomical tuning and calcareous plankton biochronology of ODP Site 926 between 5 and 14.4 Ma. Palaeogeogr. Palaeoclimatol. Palaeoecol. 369, 430–451 (2013).
Wilkens, R. H. et al. Revisiting the Ceara Rise, equatorial Atlantic Ocean: isotope stratigraphy of ODP Leg 154 from 0 to 5 Ma. Clim. Past 13, 779–793 (2017).
Barker, S., Greaves, M. & Elderfield, H. A study of cleaning procedures used for foraminiferal Mg/Ca paleothermometry. Geochem. Geophys. Geosyst. 4 (2003).
Foster, G. L. et al. Interlaboratory comparison of boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICPMS and NTIMS. Chem. Geol. 358, 1–14 (2013).
Henehan, M. J. et al. Calibration of the boron isotope proxy in the planktonic foraminifera Globigerinoides ruber for use in palaeo-CO2 reconstruction. Earth Planet. Sci. Lett. 364, 111–122 (2013).
Gutjahr, M. et al. Sub-permil interlaboratory consistency for solution-based boron isotope analyses on marine carbonates. Geostand. Geoanal. Res. 45, 59–75 (2021).
Rae, J. W. B., Foster, G. L., Schmidt, D. N. & Elliott, T. Boron isotopes and B/Ca in benthic foraminifera: proxies for the deep ocean carbonate system. Earth Planet. Sci. Lett. 302, 403–413 (2011).
Gattuso, J.-P., Epitalon, J.-M., Lavigne, H. & Orr, J. seacarb: Seawater Carbonate Chemistry. R package version 3.2.16. https://CRAN.R-project.org/package=seacarb (2021)
Millero, F. J. Thermodynamics of the carbon dioxide system in the oceans. Geochim. Cosmochim. Acta 59, 661–677 (1995).
Dickson, A. G. Thermodynamics of the dissociation of boric acid in synthetic seawater from 273.15 to 318.15 K. Deep Sea Res. Part A 37, 755–766 (1990).
Klochko, K., Kaufman, A. J., Yao, W., Byrne, R. H. & Tossell, J. A. Experimental measurement of boron isotope fractionation in seawater. Earth Planet. Sci. Lett. 248, 276–285 (2006).
Anand, P., Elderfield, H. & Conte, M. H. Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography 18, 28–31 (2003).
Dekens, P. S., Lea, D. W., Pak, D. K. & Spero, H. J. Core top calibration of Mg/Ca in tropical foraminifera: Refining paleotemperature estimation. Geochem. Geophys. Geosystems 3, 1022 (2002).
Lear, C. H. et al. Neogene ice volume and ocean temperatures: insights from infaunal foraminiferal Mg/Ca paleothermometry. Paleoceanography 30, 2015PA002833 (2015).
Hasiuk, F. J. & Lohmann, K. C. Application of calcite Mg partitioning functions to the reconstruction of paleocean Mg/Ca. Geochim. Cosmochim. Acta 74, 6751–6763 (2010).
Evans, D. & Müller, W. Deep time foraminifera Mg/Ca paleothermometry: nonlinear correction for secular change in seawater Mg/Ca. Paleoceanography 27, PA4205 (2012).
Lueker, T. J., Dickson, A. G. & Keeling, C. D. Ocean pCO2 calculated from dissolved inorganic carbon, alkalinity, and equations for K1 and K2: validation based on laboratory measurements of CO2 in gas and seawater at equilibrium. Mar. Chem. 70, 105–119 (2000).
Foster, G. L. & Rae, J. W. B. Reconstructing ocean pH with boron isotopes in foraminifera. Annu. Rev. Earth Planet. Sci. 44, 207–237 (2016).
Zeebe, R. E. & Wolf-Gladrow, D. CO2 in Seawater: Equilibrium, Kinetics, Isotopes (Gulf Professional, 2001).
R Core Team R: A Language and Environment for Statistical Computing (R Foundation for Statistical Computing, 2019).
Rousselle, G., Beltran, C., Sicre, M.-A., Raffi, I. & De Rafélis, M. Changes in sea-surface conditions in the equatorial Pacific during the middle Miocene–Pliocene as inferred from coccolith geochemistry. Earth Planet. Sci. Lett. 361, 412–421 (2013).
Rayner, N. A. Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. J. Geophys. Res. 108, 4407 (2003).
Tierney, J. E. et al. Glacial cooling and climate sensitivity revisited. Nature 584, 569–573 (2020).
Jia, G., Chen, F. & Peng, P. Sea surface temperature differences between the western equatorial Pacific and northern South China Sea since the Pliocene and their paleoclimatic implications. Geophys. Res. Lett. 35 (2008).
Sikes, E. L., Howard, W. R., Neil, H. L. & Volkman, J. K. Glacial–interglacial sea surface temperature changes across the subtropical front east of New Zealand based on alkenone unsaturation ratios and foraminiferal assemblages. Paleoceanography 17, 1012 (2002).
Martínez-Garcia, A., Rosell-Melé, A., McClymont, E. L., Gersonde, R. & Haug, G. H. Subpolar link to the emergence of the modern equatorial Pacific cold tongue. Science 328, 1550–1553 (2010).
Herbert, T. D. et al. Collapse of the California current during glacial maxima linked to climate change on land. Science 293, 71–76 (2001).
Paillard, D., Labeyrie, L. & Yiou, P. AnalySeries (2005).
Schlitzer, R. Ocean Data View (2018); https://odv.awi.de/
Diester-Haass, L., Billups, K. & Emeis, K. C. In search of the late Miocene–early Pliocene “biogenic bloom” in the Atlantic Ocean (Ocean Drilling Program Sites 982, 925, and 1088). Paleoceanography 20, PA4001 (2005).
Tian, J. et al. Paleoceanography of the east equatorial Pacific over the past 16 Myr and Pacific–Atlantic comparison: High resolution benthic foraminiferal δ18O and δ13C records at IODP Site U1337. Earth Planet. Sci. Lett. 499, 185–196 (2018).
Acknowledgements
We are grateful to the staff at the Bremen core repository and the ΙODP for providing sample material. We also thank M. Spencer, B. Hambach, J. A. Milton, M. Cooper, and A. Michalik as well as the rest of the ‘B-team’ for laboratory assistance. This work was supported by Natural Environment Research Council grants NE/P011381/1 to G.L.F., P.A.W. and T.B.C. and NE/L002531/1 to R.M.B., the Leverhulme Trust through support to T.B.C. and the Royal Society (Challenge Grant to P.A.W. and A.J.C.) and Wolfson Merit awards to P.A.W. and G.L.F.
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R.M.B. and T.B.C. provided primary data based on their laboratory work. G.L.F., T.B.C. and P.A.W. conceived the project. R.M.B. produced the first draft of the manuscript, and all authors contributed to the final text. R.M.B. performed all statistical data analysis and compiled the data with input from A.J.C. on chronology.
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Nature Geoscience thanks Sarah Feakins, Laura Haynes and Baerbel Hoenisch for their contribution to the peer review of this work. Primary Handling Editor: Rebecca Neely, in collaboration with the Nature Geoscience team.
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Extended data
Extended Data Fig. 1 Map of mean annual ΔCO2 and SST labelled with site locations.
a) Map of mean annual modern ΔCO2 (parts per million, ppm) between surface ocean and the atmosphere with sample site ODP 926 (3° 43’16.49” N and 42° 54’47.83” W, and water depth of 3598 m). Data from ref. 60. b) Map of the sites used to generate the ΔSST stack with mean annual modern SST from Levitus World Ocean Atlas database. See supplementary Table 3 for locations and depths of ΔSST sample sites. Figures constructed and data visualised in Ocean Data View138.
Extended Data Fig. 2 Neogene of T. trilobus δ11B.
Data collected from ODP 926, ODP 1000 (red square), ODP 761 (red diamond) and ODP 872 (red triangle). Error bars represent 2sd.
Extended Data Fig. 3 Sensitivity of atmospheric carbon dioxide and ΔFCO2 estimates to δ11B for seawater.
Reconstructed CO2 (left axis, blue lines) and ΔFCO2 (right axis, orange lines) for time intervals before (6.5 Ma), during (5.9 Ma) and after (5.0 Ma) Late Miocene temperature minimum using modern DIC (Top) at ODP 926 (2027 (±250) µmol kg−1, ref. 108) and Neogene DIC reconstructions (Bottom, ref. 10).
Extended Data Fig. 6 All ΔSST records using in ΔSST stack.
Alkenone derived ΔSST records used in ΔSST stack. Recalibrated using BAYSPLINE method from ref. 43.
Extended Data Fig. 7 Jackknifing ΔSST stack.
Each ΔSST record is sequentially removed from the stack to ensure that no one record has undue weight on the stack.
Extended Data Fig. 8 Comparison of ΔGMAST stack from ref. 51 with ΔGMAST stack from sample sites.
a) Map of the sites used to generate the ΔGMAST stack with mean annual modern SST from ref. 60 for the Late Miocene and last 100kyr stacks. See Supplementary Table 3 for locations of ΔSST sample sites and references. Figures constructed and data visualised in Ocean Data View138 with modern SST data from Levitis Ocean Atlas Data base. b) ΔGMAST stacked record using the same sites as used in the late Miocene Stack for the last 100 kyr (dark blue error band, 68% of Monte Carlo simulations; light blue error band, 95% of Monte Carlo simulations) and from ref. 51 (dark red error band, 1sd; light red error band, 2sd). Change in LGM ΔGMAST for recent proxy compilation (black dashed line)132.
Extended Data Fig. 9 Μaximum constraints on climate sensitivity.
(Top) Forced alignment between ΔFCO2 (orange) and ΔGMAST stack (blue). Light blue/orange and dark blue/orange represent 95% and 68% uncertainty as calculated in Monte Carlo simulations described in methods for ΔFCO2 and ΔGMAST respectively. (Bottom) SIMEX regression91 of aligned ΔFCO2 and ΔGMAST. Error bars represent 2sd error. Black line represents SIMEX regression. Dashed blue line represent error on SIMEX regression.
Supplementary information
Supplementary Information
Supplementary Figs. 1–9.
Supplementary Table 1
Reports information relevant to site location, sampling resolution and references to sources of original temperature measurements for late Miocene SST stack.
Supplementary Table 2
Data for stable isotopes (δ11B, δ13C and δ18O), elemental ratios (Al/Ca, Mg/Ca and B/Ca) and pH and CO2 estimates based on δ11B.
Supplementary Table 3
Compilation of key equilibrium climate sensitivity studies.
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Brown, R.M., Chalk, T.B., Crocker, A.J. et al. Late Miocene cooling coupled to carbon dioxide with Pleistocene-like climate sensitivity. Nat. Geosci. 15, 664–670 (2022). https://doi.org/10.1038/s41561-022-00982-7
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DOI: https://doi.org/10.1038/s41561-022-00982-7