Sea-level fluctuations of about 20–30 m occurred throughout the last glacial period. These fluctuations seem to have been derived primarily from changes in the volume of Northern Hemisphere ice sheets1,2,3, and cannot be attributed solely to ice melt caused by varying solar radiation4. Here we use a fully coupled climate model to show that the transport of relatively fresh Pacific water into the North Atlantic Ocean was limited when lower sea level restricted or closed the Bering Strait, resulting in saltier North Atlantic surface waters. This invigorated deep convection in the North Atlantic Ocean, strengthening meridional overturning circulation and northward heat transport in our model, which consequently promoted melting of ice sheets in North America and Europe. Our simulations show that the associated sea-level rise led to a reopening of the Bering Strait; the flux of relatively fresh water into the North Atlantic Ocean muted meridional overturning circulation and led to cooling and ice-sheet advance in the Northern Hemisphere. We conclude that the repetition of this cycle could produce the sea-level changes that have been observed throughout the last glacial cycle.
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Church, J. et al. in IPCC Climate Change 2001: The Scientific Basis (eds Houghton, J. T. et al.) 639–693 (Cambridge Univ. Press, 2001).
Svendsen, J. I. et al. Late quaternary ice sheet history of northern Eurasia. Quat. Sci. Rev. 23, 1229–1271 (2004).
Lambeck, K. et al. Constraints on the Late Saalian to early Middle Weichselian ice sheet of Eurasia from field data and rebound modelling. Boreas 35, 539–575 (2006).
Milankovitch, M. Kanon der Erdbestrahlung und seine Anwendung auf das Eiszeitenproblem (Acade’mie Royale Serbe Editions Speciales Section des Sciences Mathe’matiques et Naturelles, Tome CXXXIII, Stamparija Mihaila Curcica, 1941).
Wang, Z. & Mysak, L. A. Simulation of the last glacial inception and rapid ice sheet growth in the McGill paleoclimate model. Geophys. Res. Lett. 29, 2102 (2002).
Kageyama, M. et al. Quantifying ice-sheet feedbacks during the last glacial inception. Geophys. Res. Lett. 31, L24203 (2004).
Calov, R. et al. Transient simulation of the last glacial inception. Part I: Glacial inception as a bifurcation in the climate system. Clim. Dyn. 24, 545–561 (2005).
Stirling, C. H. et al. Timing and duration of the last interglacial: Evidence for a restricted interval of widespread coral reef growth. Earth Planet. Sci. Lett. 160, 745–762 (1998).
Lambeck, K. & Chappell, J. Sea level change through the last glacial cycle. Science 292, 679–686 (2001).
Stocker, T. F. North–south connections. Science 297, 1814–1815 (2002).
Stouffer, R. J. et al. Investigating the causes of the response of the thermohaline circulation to past and future climate changes. J. Clim. 19, 1365–1387 (2006).
Dansgaard, W. et al. Evidence for general instability for past climate from a 250-kyr ice-core record. Nature 364, 218–220 (1993).
Heinrich, H. Origin and consequences of cyclic ice rafting in the northeast Atlantic Ocean during the past 130,000 years. Quat. Res. 29, 143–152 (1988).
Hemming, S. R. Heinrich events: Massive late Pleistocene detritus layers of the North Atlantic and their global climate imprint. Rev. Geophys. 42, RG1005 (2004).
Weaver, A. J., Saenko, O. A., Clark, P. U. & Mitrovica, J. X. Meltwater pulse 1A from Antarctica as a trigger of the Bølling–Allerød warm interval. Science 299, 1709–1713 (2003).
Liu, Z. et al. Transient simulation of last deglaciation with a new mechanism for Bølling–Allerød warming. Science 325, 310–314 (2009).
Hu, A., Meehl, G. A., Washington, W. M. & Dai, A. Response of the Atlantic thermohaline circulation to increased atmospheric CO2 in a coupled model. J. Clim. 17, 4267–4279 (2004).
Gregory, J. M. et al. A model intercomparison of changes in the Atlantic thermohaline circulation in response to increasing atmospheric CO2 concentration. Geophys. Res. Lett. 32, L12703 (2005).
Woodgate, R. A. & Aagaard, K. Revising the Bering Strait freshwater flux into the Arctic Ocean. Geophys. Res. Lett. 32, L02602 (2005).
Shaffer, G. & Bendtsen, J. Role of the Bering Strait in controlling North Atlantic Ocean circulation and climate. Nature 367, 354–357 (1994).
De Boer, A. M. & Nof, D. The exhaust valve of the North Atlantic. J. Clim. 17, 417–422 (2004).
Hu, A. et al. Response of themohaline circulation to freshwater forcing under present day and LGM conditions. J. Clim. 21, 2239–2258 (2008).
Sandal, C. & Nof, D. A new analytical model for Heinrich events and climate instability. J. Phys. Oceanogr. 38, 451–466 (2008).
Collins, W. D. et al. The community climate system model: CCSM3. J. Clim. 19, 2122–2143 (2006).
Berger, A. Long-term variations of daily insolation and quaternary climatic changes. J. Atmos. Sci. 35, 2362–2367 (1978).
Loutre, M. F. et al. Does mean annual insolation have the potential to change the climate? Earth Planet. Sci. Lett. 221, 1–14 (2004).
Petit, J. R. et al. Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica. Nature 399, 429–436 (1999).
Loulergue, L. et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years. Nature 453, 383–386 (2008).
Huybrechts, P., Letreguilly, A. & Reeh, N. The Greenland ice sheet and greenhouse warming. Palaeogeogr. Palaeoclimatol. Palaeoecol. 89, 399–412 (1991).
North Greenland Ice Core Project members. High-resolution record of Northern Hemisphere climate extending into the last interglacial period. Nature 431, 147–151 (2004).
The authors thank W. H. Lipscomb for the constructive discussion of the positive degree day method. A portion of this study was supported by the Office of Science (BER), US Department of Energy, Cooperative Agreement No. DE-FC02-97ER62402. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
The authors declare no competing financial interests.
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Hu, A., Meehl, G., Otto-Bliesner, B. et al. Influence of Bering Strait flow and North Atlantic circulation on glacial sea-level changes. Nature Geosci 3, 118–121 (2010). https://doi.org/10.1038/ngeo729
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