Tropical volcanoes synchronize eastern Canada with Northern Hemisphere millennial temperature variability.

Wang, Feng; Arseneault, Dominique; Boucher, Étienne; Gennaretti, Fabio; Yu, Shulong et Zhang, Tongwen (2022). Tropical volcanoes synchronize eastern Canada with Northern Hemisphere millennial temperature variability. Nature Communications , vol. 13 , nº 1. p. 5042. DOI: 10.1038/s41467-022-32682-6.

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Résumé

Although global and Northern Hemisphere temperature reconstructions are coherent with climate model simulations over the last millennium, reconstructed temperatures tend to diverge from simulations at smaller spatial scales. Yet, it remains unclear to what extent these regional peculiarities reflect region-specific internal climate variability or inadequate proxy coverage and quality. Here, we present a high-quality, millennial-long summer temperature reconstruction for northeastern North America, based on maximum latewood density, the most temperature-sensitive tree-ring proxy. Our reconstruction shows that a large majority (31 out of 44) of the coldest extremes can be attributed to explosive volcanic eruptions, with more persistent cooling following large tropical than extratropical events. These forced climate variations synchronize regional summer temperatures with hemispheric reconstructions and simulations at the multidecadal time scale. Our study highlights that tropical volcanism is the major driver of multidecadal temperature variations across spatial scales.

Type de document:	Article
Mots-clés libres:	climate modeling; Northern Hemisphere; proxy climate record; reconstruction; temperature profile; tropical region; volcanism; volcano
Centre:	Centre Eau Terre Environnement
Date de dépôt:	14 oct. 2022 20:11
Dernière modification:	14 oct. 2022 20:11
URI:	https://espace.inrs.ca/id/eprint/13092

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