Michel, Simon L. L. and Swingedouw, Didier and Ortega, Pablo and Gastineau, Guillaume and Mignot, Juliette and McCarthy, Gerard and Khodri, Myriam (2022) Early warning signal for a tipping point suggested by a millennial Atlantic Multidecadal Variability reconstruction. Nature Communications, 13 (5176). pp. 1-14. ISSN 2041-1723

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Abstract

Atlantic multidecadal variability is a coherent mode of natural climate variability occurring in the North Atlantic Ocean, with strong impacts on human societies and ecosystems worldwide. However, its periodicity and drivers are widely debated due to the short temporal extent of instrumental observations and competing effects of both internal and external climate factors acting on North Atlantic surface temperature variability. Here, we use a paleoclimate database and an advanced statistical framework to generate, evaluate, and compare 312 reconstructions of the Atlantic multidecadal variability over the past millennium, based on different indices and regression methods. From this process, the best reconstruction is obtained with the random forest method, and its robustness is checked using climate model outputs and independent oceanic paleoclimate data. This reconstruction shows that memory in variations of Atlantic multidecadal variability have strongly increased recently—a potential early warning signal for the approach of a North Atlantic tipping point.

Item Type:	Article
Keywords:	Early warning signal; tipping point; millennial; Atlantic Multidecadal Variability; reconstruction;
Academic Unit:	Faculty of Social Sciences > Geography Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
Item ID:	17495
Identification Number:	https://doi.org/10.1038/s41467-022-32704-3
Depositing User:	Gerard McCarthy
Date Deposited:	05 Sep 2023 15:06
Journal or Publication Title:	Nature Communications
Publisher:	Nature Publshing Group
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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