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Annually resolved Atlantic sea surface temperature variability over the past 2,900 y.

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Lapointe, François; Bradley, Raymond S.; Francus, Pierre; Balascio, Nicholas L.; Abbott, Mark B.; Stoner, Joseph; St-Onge, Guillaume; De Coninck, Arnaud; Labarre, Thibault (2020). Annually resolved Atlantic sea surface temperature variability over the past 2,900 y. Proceedings of the National Academy of Sciences , vol. 117 , nº 44. p. 27171-27178. DOI: 10.1073/pnas.2014166117.

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Résumé

Global warming due to anthropogenic factors can be amplified or dampened by natural climate oscillations, especially those involving sea surface temperatures (SSTs) in the North Atlantic which vary on a multidecadal scale (Atlantic multidecadal variability, AMV). Because the instrumental record of AMV is short, long-term behavior of AMV is unknown, but climatic teleconnections to regions beyond the North Atlantic offer the prospect of reconstructing AMV from high-resolution records elsewhere. Annually resolved titanium from an annually laminated sedimentary record from Ellesmere Island, Canada, shows that the record is strongly influenced by AMV via atmospheric circulation anomalies. Significant correlations between this High-Arctic proxy and other highly resolved Atlantic SST proxies demonstrate that it shares the multidecadal variability seen in the Atlantic. Our record provides a reconstruction of AMV for the past ∼3 millennia at an unprecedented time resolution, indicating North Atlantic SSTs were coldest from ∼1400–1800 CE, while current SSTs are the warmest in the past ∼2,900 y.

Type de document: Article
Mots-clés libres: Atlantic multidecadal variability; Arctic climate; global warming
Centre: Centre Eau Terre Environnement
Date de dépôt: 30 nov. 2020 18:52
Dernière modification: 30 nov. 2020 18:52
URI: http://espace.inrs.ca/id/eprint/10775

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