GEOSCAN, résultats de la recherche


TitreBayesian multiproxy temperature reconstruction with black spruce ring widths and stable isotopes from the northern Quebec taiga
AuteurGennaretti, F; Huard, D; Naulier, M; Savard, M; Bégin, C; Arseneault, D; Guiot, J
SourceClimate Dynamics vol. 49, 12-Nov, 2017 p. 4107-4119, (Accès ouvert)
Séries alt.Ressources naturelles Canada, Contribution externe 20182035
ÉditeurSpringer Verlag
Documentpublication en série
Mediapapier; en ligne; numérique
ProgrammeSources, Géosciences environnementales
Diffusé2017 03 01
Résumé(disponible en anglais seulement)
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 ?18O and six ring width chronologies. Until now, these chronologies have only been used in independent temperature reconstructions (from ?18O or ring width) showing some differences. Here, we added to the dataset a ?13C chronology and developed a significantly improved millennium-long multiproxy reconstruction (997Ð2006 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, ?18O showed intermediate responses, and ?13C 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. © 2017, The Author(s).