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TitleLes séries dendroisotopiques et leur signification climatique
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBégin, C; Savard, M MORCID logo; Marion, J; Gingras, M
SourceUtilisation des archives naturelles pour la reconstitution du passé hydro-climatique; by Bégin, C; Nicault, A; Bégin, Y; Geological Survey of Canada, Open File 8768, 2021 p. 45-52, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Utilisation des archives naturelles pour la reconstitution du passé hydro-climatique
File formatpdf
NTS22M; 22N; 22O; 23B; 23C; 32D; 23E; 23F; 23G; 23J; 23K; 23L; 32M; 32N; 32O; 32P; 33A; 33B; 33C; 33D; 33E; 33F; 33G; 33H; 33I; 33J; 33K; 33L
AreaComplexe La Grande
Lat/Long WENS -79.5000 -66.0000 55.0000 51.0000
Subjectsenvironmental geology; hydrogeology; geochemistry; Nature and Environment; Science and Technology; Recent; climatology; paleoclimatology; dendrochronology; stable isotope studies; carbon isotopes; oxygen isotopes; watersheds; hydrologic environment; hydrologic properties; meteorology; temperature; precipitation; statistical analyses; surface waters; rivers; discharge rates; Le projet ARCHIVES; Climate change; Hydrology; Boreal ecosystems; Forests; Wood; Biology; Environmental indicators; Phanerozoic; Cenozoic; Quaternary
Illustrationstime series; tables; bar graphs
ProgramClimate Change Geoscience Extreme Events
Released2021 06 28
AbstractThree carbon and oxygen dendroisotopic series representative of the upstream sector of the La Grande River watershed and covering the period between 1800 and 2005 were produced under the ARCHIVES project. In order to use tree-ring isotopic ratios to reconstruct climatic conditions of the last centuries, we first assessed their climatic significance by conducting a statistical study of their relationship with hydrometeorological series available for the region. The results show that the two types of isotopic ratios in wood cellulose (delta-13C and delta-18O) are generally sensitive to the same climatic parameters, but at varying degrees, and that this sensitivity increases when the two isotopic indicators are combined (mean delta-13C and delta-18O values). They respond to the maximum temperature and total precipitation of the summer season (June to August), and also to some parameters integrating several aspects of the regional climate such as a climate index combining temperatures and precipitations, the vapor pressure deficit (VPD) and regional River discharge. VPD is the parameter that most strongly correlates with the isotopic values, due to its direct influence on isotope fractionation processes related to stomatal functioning. The results presented in this chapter, clearly show that isotopic ratios of black spruce trees can be considered as excellent climate indicators for the boreal sector of northeastern America.

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