Underestimation of the Tambora effects in North American taiga ecosystems

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Gennaretti , F , Boucher , E , Nicault , A , Gea-Izquierdo , G , Arseneault , D , Berninger , F , Savard , M M , Begin , C & Guiot , J 2018 , ' Underestimation of the Tambora effects in North American taiga ecosystems ' , Environmental Research Letters , vol. 13 , no. 3 , 034017 . https://doi.org/10.1088/1748-9326/aaac0c

Title: Underestimation of the Tambora effects in North American taiga ecosystems
Author: Gennaretti, Fabio; Boucher, Etienne; Nicault, Antoine; Gea-Izquierdo, Guillermo; Arseneault, Dominique; Berninger, Frank; Savard, Martine M.; Begin, Christian; Guiot, Joel
Contributor: University of Helsinki, Department of Forest Sciences
Date: 2018-03
Language: eng
Number of pages: 12
Belongs to series: Environmental Research Letters
ISSN: 1748-9326
URI: http://hdl.handle.net/10138/233507
Abstract: 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.
Subject: tambora legacy
Eastern Canada
regional climate responses
terrestrial biosphere responses
forest demography
mechanistic understanding
process-based modeling
TREE-RING CHRONOLOGIES
LAST 2000 YEARS
VOLCANIC-ERUPTIONS
CARBON ALLOCATION
CLIMATE-CHANGE
BOREAL FOREST
TEMPERATURE
CANADA
PHOTOSYNTHESIS
ISOTOPES
4112 Forestry
1172 Environmental sciences
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