GEOSCAN Search Results: Fastlink


TitleTraitement et production d'une série dendroisotopique millénaire
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorNaulier, M; Savard, M MORCID logo; Bégin, C; Arseneault, D
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. 183-187, 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
AreaComplexe La Grande
Lat/Long WENS -71.4031 -71.4025 54.9422 54.9417
Subjectsenvironmental geology; hydrogeology; geochemistry; paleontology; soils science; Nature and Environment; Science and Technology; watersheds; climatology; paleoclimatology; hydrologic environment; dendrochronology; stable isotope studies; carbon isotopes; oxygen isotopes; fossils; fossil plants; sampling methods; sample preparation; statistical analyses; correlations; soils; temperature; lake sediment cores; Le projet ARCHIVES; Methodology; Climate change; Hydrology; Boreal ecosystems; Forests; Trees; lacustrine sediments; Phanerozoic; Cenozoic; Quaternary
Illustrationstime series
ProgramClimate Change Geoscience Extreme Events
Released2021 06 28
AbstractThe stable isotopic ratios of carbon and oxygen in tree rings are remarkable paleoclimatic data. In northeastern Canada, where climatic reconstructions longer than 500 years are very rare and where none is based on tree-ring isotopes, subfossil stems from boreal lakes can be used to produce long isotopic series. The most important steps in producing millennial isotopic series consist in selecting the material to study (lakes, living trees, subfossil stems) and the method to sample tree rings in order to obtain a climate reconstruction of high temporal resolution. The climatic significance of the isotopic ratios was determined by correlations with climatic parameters, and validated by our understanding of the physiological and pedogeochemical response mechanisms. The significant correlation obtained for the delta-18O series with summer maximal temperature has allowed reconstructing the mean of June-July maximum temperature over the last millennium by using subfossil stems recovered from a boreal lake. This new millennial series, the first isotopic series in northeastern Canada, is one of the first in the world to use delta-18O values as a proxy for climate. It brings new knowledge of the past climate for northeastern Quebec by highlighting that the medieval warm anomaly (1000-1250 AD) was as warm as the last three decades and the warming observed since 1970 is one of the most important of the last millennium.

Date modified: