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

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 A...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences
Main Authors: Lapointe, Francois, Bradley, Raymond S., Francus, Pierre, Balascio, Nicholas L., Abbott, Mark B., Stoner, Joseph S., St-Onge, Guillaume, De Coninck, Arnaud, Labarre, Thibault
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Earth and Environmental Sciences
SAHEL RAINFALL
ICE-AGE
CONFIGURATION
RECORD
Atlantic multidecadal variability
Arctic climate
global warming
Arctic
Ellesmere Island
Canada
Global warming
North Atlantic
Online Access:https://biblio.ugent.be/publication/8761107
http://hdl.handle.net/1854/LU-8761107
https://doi.org/10.1073/pnas.2014166117
https://biblio.ugent.be/publication/8761107/file/8761108
Description
Summary: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 similar to 3 millennia at an unprecedented time resolution, indicating North Atlantic SSTs were coldest from similar to 1400-1800 CE, while current SSTs are the warmest in the past similar to 2,900 y.

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