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Access through your institution Buy or subscribe replying to K. H. Kilbourne et al. _Nature Geoscience_ https://doi.org/10.1038/s41561-022-00896-4 (2022) We thank the authors for their
comment and welcome the opportunity to respond. Kilbourne et al.1 make the argument that if more proxies from the North Atlantic had been considered, the conclusion reached in Caesar et al.2
would have been different. Although it is certainly true that a comprehensive set of palaeoceanographic proxy data available in the North Atlantic region shows a complex picture of the
evolution of the North Atlantic over the past two millennia3, most of these proxies are not strongly linked to the strength of the Atlantic Meridional Overturning Circulation (AMOC). This is
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ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support REFERENCES * Kilbourne, K. H. et al. Atlantic circulation change still
uncertain. _Nat. Geosci_. https://doi.org/10.1038/s41561-022-00896-4 (2022). * Caesar, L., McCarthy, G. D., Thornalley, D. J. R., Cahill, N. & Rahmstorf, S. Current Atlantic Meridional
Overturning Circulation weakest in last millennium. _Nat. Geosci._ 14, 118–120 (2021). Article Google Scholar * Moffa-Sánchez, P. et al. Variability in the northern North Atlantic and
Arctic Oceans across the last two millennia: a review. _Paleoceanogr. Paleoclimatol._ 34, 1399–1436 (2019). Article Google Scholar * Rahmstorf, S. et al. Exceptional twentieth-century
slowdown in Atlantic Ocean overturning circulation. _Nat. Clim. Change_ 5, 475–480 (2015). Article Google Scholar * Thornalley, D. J. R. et al. Anomalously weak Labrador Sea convection and
Atlantic overturning during the past 150 years. _Nature_ 556, 227–230 (2018). Article Google Scholar * Caesar, L., Rahmstorf, S., Robinson, A., Feulner, G. & Saba, V. Observed
fingerprint of a weakening Atlantic Ocean overturning circulation. _Nature_ 556, 191–196 (2018). Article Google Scholar * Smeed, D. A. et al. Observed decline of the Atlantic Meridional
Overturning Circulation 2004–2012. _Ocean Sci._ 10, 29–38 (2014). Article Google Scholar * Østerhus, S. et al. Arctic Mediterranean exchanges: a consistent volume budget and trends in
transports from two decades of observations. _Ocean Sci._ 15, 379–399 (2019). Article Google Scholar * Thornalley, D. J. R. et al. Long-term variations in Iceland–Scotland overflow
strength during the Holocene. _Clim. Past._ 9, 2073–2084 (2013). Article Google Scholar * Wanamaker, A. D. et al. Surface changes in the North Atlantic Meridional Overturning Circulation
during the last millennium. _Nat. Commun._ 3, 899 (2012). Article Google Scholar * Lohmann, G. & Schöne, B. R. Climate signatures on decadal to interdecadal time scales as obtained
from mollusk shells (_Arctica islandica_) from Iceland. _Palaeogeogr. Palaeoclimatol. Palaeoecol._ 373, 152–162 (2013). Article Google Scholar * Keil, P. et al. Multiple drivers of the
North Atlantic warming hole. _Nat. Clim. Change_ 10, 667–671 (2020). Article Google Scholar * Worthington, E. L. et al. A 30-year reconstruction of the Atlantic Meridional Overturning
Circulation shows no decline. _Ocean Sci._ 17, 285–299 (2021). Article Google Scholar * Frajka-Williams, E. Estimating the Atlantic overturning at 26° N using satellite altimetry and cable
measurements. _Geophys. Res. Lett._ 42, 3458–3464 (2015). Article Google Scholar * Weijer, W., Cheng, W., Garuba, O. A., Hu, A. & Nadiga, B. T. CMIP6 models predict significant 21st
century decline of the Atlantic Meridional Overturning Circulation. _Geophys. Res. Lett._ 47, e2019GL086075 (2020). Article Google Scholar * Osman, M. B. et al. Industrial-era decline in
subarctic Atlantic productivity. _Nature_ 569, 551–555 (2019). Article Google Scholar Download references ACKNOWLEDGEMENTS L.C., N.C. and G.D.M. are supported by the A4 project. A4
(Grant-Aid Agreement no. PBA/CC/18/01) is carried out with the support of the Marine Institute under the Marine Research Programme funded by the Irish Government. D.J.R.T. is supported by UK
NERC grant NE/S009736/1. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Irish Climate Analysis and Research Units (ICARUS), Department of Geography, Maynooth University, Maynooth, Ireland L.
Caesar, G. D. McCarthy & N. Cahill * Potsdam Institute for Climate Impact Research (PIK), Member of the Leibniz Association, Potsdam, Germany L. Caesar & S. Rahmstorf * Department
of Geography, University College London, London, UK D. J. R. Thornalley * Department of Mathematics and Statistics, Maynooth University, Kildare, Ireland N. Cahill * Institute of Physics and
Astronomy, University of Potsdam, Potsdam, Germany S. Rahmstorf Authors * L. Caesar View author publications You can also search for this author inPubMed Google Scholar * G. D. McCarthy
View author publications You can also search for this author inPubMed Google Scholar * D. J. R. Thornalley View author publications You can also search for this author inPubMed Google
Scholar * N. Cahill View author publications You can also search for this author inPubMed Google Scholar * S. Rahmstorf View author publications You can also search for this author inPubMed
Google Scholar CONTRIBUTIONS L.C. created the figures and wrote the manuscript. All authors contributed to the discussion of and provided input to the manuscript. CORRESPONDING AUTHOR
Correspondence to L. Caesar. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing interests. PEER REVIEW PEER REVIEW INFORMATION _Nature Geoscience_ thanks the anonymous
reviewers for their contribution to the peer review of this work. Primary Handling editor: James Super, in collaboration with the _Nature Geoscience_ team. ADDITIONAL INFORMATION PUBLISHER’S
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ARTICLE CITE THIS ARTICLE Caesar, L., McCarthy, G.D., Thornalley, D.J.R. _et al._ Reply to: Atlantic circulation change still uncertain. _Nat. Geosci._ 15, 168–170 (2022).
https://doi.org/10.1038/s41561-022-00897-3 Download citation * Received: 31 July 2021 * Accepted: 11 January 2022 * Published: 17 February 2022 * Issue Date: March 2022 * DOI:
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