TITLE

Bayesian multiproxy temperature reconstruction with black spruce ring widths and stable isotopes from the northern Quebec taiga

AUTHOR(S)
Gennaretti, Fabio; Huard, David; Naulier, Maud; Savard, Martine; Bégin, Christian; Arseneault, Dominique; Guiot, Joel
PUB. DATE
December 2017
SOURCE
Climate Dynamics;Dec2017, Vol. 49 Issue 11/12, p4107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Northeastern North America has very few millennium-long, high-resolution climate proxy records. However, very recently, a new tree-ring dataset suitable for temperature reconstructions over the last millennium was developed in the northern Quebec taiga. This dataset is composed of one δO and six ring width chronologies. Until now, these chronologies have only been used in independent temperature reconstructions (from δO or ring width) showing some differences. Here, we added to the dataset a δC chronology and developed a significantly improved millennium-long multiproxy reconstruction (997-2006 CE) accounting for uncertainties with a Bayesian approach that evaluates the likelihood of each proxy model. We also undertook a methodological sensitivity analysis to assess the different responses of each proxy to abrupt forcings such as strong volcanic eruptions. Ring width showed a larger response to single eruptions and a larger cumulative impact of multiple eruptions during active volcanic periods, δO showed intermediate responses, and δC was mostly insensitive to volcanic eruptions. We conclude that all reconstructions based on a single proxy can be misleading because of the possible reduced or amplified responses to specific forcing agents.
ACCESSION #
126245905

 

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