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TitreUnderestimation of the Tambora effects in North American taiga ecosystems
AuteurGennaretti, F; Boucher, E; Nicault, A; Gea-Izquierdo, G; Arseneault, D; Berninger, F; Savard, M M; Bégin, C; Guiot, J
Sourcevol. 13, 3, 2018., (Accès ouvert)
Séries alt.Ressources naturelles Canada, Contribution externe 20182303
ÉditeurInstitute of Physics Publishing
Documentpublication en série
Mediapapier; en ligne; numérique
ProgrammeSources, Géosciences environnementales
Diffusé2018 02 23
Résumé(disponible en anglais seulement)
The Tambora eruption (1815 AD) was one of the major eruptions of the last two millennia and has no equivalents over the last two centuries. Here, we collected an extensive network of early meteorological time series, climate simulation data and numerous, well-replicated proxy records from Eastern Canada to analyze the strength and the persistence of the Tambora impact on the regional climate and forest processes. Our results show that the Tambora impacts on the terrestrial biosphere were stronger than previously thought, and not only affected tree growth and carbon uptake for a longer period than registered in the regional climate, but also determined forest demography and structure. Increased tree mortality, four times higher than the background level, indicates that the Tambora climatic impact propagated to influence the structure of the North American taiga for several decades. We also show that the Tambora signal is more persistent in observed data (temperature, river ice dynamics, forest growth, tree mortality) than in simulated ones (climate and forest-growth simulations), indicating that our understanding of the mechanisms amplifying volcanic perturbations on climates and ecosystems is still limited, notably in the North American taiga. © 2018 IOP Publishing Ltd.