Abstract
There were several centennial-scale fluctuations in the climate and oceanography of the North Atlantic region over the past 1,000 years, including a period of relative cooling from about AD 1450 to 1850 known as the Little Ice Age1. These variations may be linked to changes in solar irradiance, amplified through feedbacks including the Atlantic meridional overturning circulation2. Changes in the return limb of the Atlantic meridional overturning circulation are reflected in water properties at the base of the mixed layer south of Iceland. Here we reconstruct thermocline temperature and salinity in this region from AD 818 to 1780 using paired δ18O and Mg/Ca ratio measurements of foraminifer shells from a subdecadally resolved marine sediment core. The reconstructed centennial-scale variations in hydrography correlate with variability in total solar irradiance. We find a similar correlation in a simulation of climate over the past 1,000 years. We infer that the hydrographic changes probably reflect variability in the strength of the subpolar gyre associated with changes in atmospheric circulation. Specifically, in the simulation, low solar irradiance promotes the development of frequent and persistent atmospheric blocking events, in which a quasi-stationary high-pressure system in the eastern North Atlantic modifies the flow of the westerly winds. We conclude that this process could have contributed to the consecutive cold winters documented in Europe during the Little Ice Age.
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References
Lamb, H. Climatic variation and changes in the wind and ocean circulation: The Little Ice Age in the northeast Atlantic. Quat. Res. 11, 1–20 (1979).
Trouet, V. et al. Persistent positive North Atlantic Oscillation mode dominated the medieval climate anomaly. Science 324, 78–80 (2009).
Østerhus, S., Turrell, W. R., Jónsson, S. & Hansen, B. Measured volume, heat, and salt fluxes from the Atlantic to the Arctic Mediterranean. Geophys. Res. Lett. 32, L07603 (2005).
Straneo, F. Heat and freshwater transport through the central Labrador Sea. J. Phys. Oceanogr. 36, 606–628 (2006).
Seager, R. et al. Is the Gulf Stream responsible for Europe’s mild winters?. Q. J. R. Meteorol. Soc. 128, 2563–2586 (2002).
Elderfield, H. & Ganssen, G. Past temperature and δ18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios. Nature 405, 442–445 (2000).
Cléroux, C. et al. Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction. Paleoceanography 23, PA3214 (2008).
Ganssen, G. M. & Kroon, D. The isotopic signature of planktonic foraminifera from NE Atlantic surface sediments: Implications for the reconstruction of past oceanic conditions. J. Geol. Soc. Lond. 157, 693–699 (2000).
Thornalley, D. J. R., Elderfield, H. & McCave, I. N. Holocene oscillations in temperature and salinity of the surface subpolar North Atlantic. Nature 457, 711–714 (2009).
Steinhilber, F., Beer, J. & Fröhlich, C. Total solar irradiance during the Holocene. Geophys. Res. Lett. 36, L19704 (2009).
Landrum, L. et al. Last millennium climate and its variability in CCSM4. J. Clim. 26, 1085–1111 (2013).
Miller, G. H. et al. Abrupt onset of the Little Ice Age triggered by volcanism and sustained by sea-ice/ocean feedbacks. Geophys. Res. Lett. 39, L02708 (2012).
Hatun, H., Sando, A. B., Drange, H., Hansen, B. & Valdimarsson, H. Influence of the Atlantic subpolar gyre on the thermohaline circulation. Science 309, 1841–1844 (2005).
Desprès, A., Reverdin, G. & d’ Ovidio, F. Mechanisms and spatial variability of meso scale frontogenesis in the northwestern subpolar gyre. Ocean Model. 39, 97–113 (2011).
Hurrell, J. W. Decadal trends in the North Atlantic Oscillation: Regional temperatures and precipitation. Science 269, 676–679 (1995).
Häkkinen, S., Rhines, P. B. & Worthen, D. L. Atmospheric blocking and Atlantic multidecadal ocean variability. Science 334, 655–659 (2011).
Condron, A. & Renfrew, I. A. The impact of polar mesoscale storms on northeast Atlantic Ocean circulation. Nature Geosci. 6, 34–37 (2013).
Langehaug, H. R., Medhaug, I., Eldevik, T. & Otterå, O. H. Arctic/Atlantic exchanges via the subpolar gyre. J. Clim. 25, 2421–2439 (2012).
Shabbar, A., Huang, J. P. & Higuchi, K. The relationship between the wintertime North Atlantic Oscillation and blocking episodes in the North Atlantic. Int. J. Climatol. 21, 355–369 (2001).
Luterbacher, J. et al. Reconstruction of sea level pressure fields over the eastern North Atlantic and Europe back to 1500. Clim. Dynam. 18, 545–561 (2002).
Gray, L. J. et al. Solar influences on climate. Rev. Geophys. 48, RG4001 (2010).
Woollings, T., Lockwood, M., Masato, G., Bell, C. & Gray, L. Enhanced signature of solar variability in eurasian winter climate. Geophys. Res. Lett. 37, L20805 (2010).
Barriopedro, D., García-Herrera, R. & Huth, R. Solar modulation of Northern Hemisphere winter blocking. J. Geophys. Res. 113, D14118 (2008).
Lockwood, M., Harrison, R. G., Woollings, T. & Solanki, S. K. Are cold winters in Europe associated with low solar activity?. Environ. Res. Lett. 5, 024001 (2010).
Shindell, D. T., Schmidt, G. A., Mann, M. E., Rind, D. & Waple, A. Solar forcing of regional climate change during the Maunder Minimum. Science 294, 2149–2152 (2001).
Ineson, S. et al. Solar forcing of winter climate variability in the Northern Hemisphere. Nature Geosci. 4, 753–757 (2011).
De Jager, C. & Duhau, S. Forecasting the parameters of sunspot cycle 24 and beyond. J. Atmos. Sol. Terr. Phys. 71, 239–245 (2009).
Barker, S., Greaves, M. & Elderfield, H. A. study of cleaning procedures used for foraminiferal Mg/Ca paleothermometry. Geochem. Geophys. Geosystems 4, 8407 (2003).
Donlon, C. J. et al. The operational sea surface temperature and sea ice analysis (ostia) system. Remote Sens. Environ. 116, 140–158 (2012).
Gao, C., Oman, L., Robock, A. & Stenchikov, G. L. Atmospheric volcanic loading derived from bipolar ice cores: Accounting for the spatial distribution of volcanic deposition. J. Geophys. Res. 112, D23111 (2007).
Acknowledgements
We are grateful to J. Becker and A. Morte-Ródenas for laboratory assistance and thank N. McCave and the crew of RV Charles Darwin 159 for their assistance with sample collection. We also thank C. C. Raible for discussions and C-F. Schleussner for early discussions on the subject. This work was financially supported by the UK National Environmental Research Council (NERC). Computing resources were provided by NCAR’s Computational and Information Systems Laboratory (CISL) sponsored by the National Science Foundation and other agencies. A.B. is supported by the European Commission under the Marie Curie Intra-European Fellowship ECLIPS (PIEF-GA-2011-300544) and the National Centre for Excellence in Research: Climate of the Swiss National Science Foundation. P.M.S. and I.R.H. also gratefully acknowledge the support of the Climate Change Consortium of Wales (www.c3wales.org).
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P.M.S. sampled the core, processed the samples and carried out the measurements, data analysis and interpretation; A.B. carried out the model analysis and interpretation. I.R.H, D.J.R.T. and S.B. supervised P.M.S. during her PhD; I.R.H. and D.J.R.T. participated in the retrieval of the sediment core material and initiated the project; all authors contributed towards the writing of the manuscript.
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Moffa-Sánchez, P., Born, A., Hall, I. et al. Solar forcing of North Atlantic surface temperature and salinity over the past millennium. Nature Geosci 7, 275–278 (2014). https://doi.org/10.1038/ngeo2094
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DOI: https://doi.org/10.1038/ngeo2094
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