| Title | Traitement et production d'une série dendroisotopique millénaire |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Naulier, M; Savard, M M ; Bégin, C; Arseneault, D |
| Source | Utilisation 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, https://doi.org/10.4095/328092  Open Access |
| Year | 2021 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | French |
| Media | on-line; digital |
| Related | This publication is contained in Utilisation des archives
naturelles pour la reconstitution du passé hydro-climatique |
| File format | pdf |
| Province | Quebec |
| NTS | 23L/14 |
| Area | Complexe La Grande |
| Lat/Long WENS | -71.4031 -71.4025 54.9422 54.9417 |
| Subjects | environmental 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 |
| Illustrations | time series |
| Program | Climate
Change Geoscience Extreme Events |
| Released | 2021 06 28 |
| Abstract | The 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.
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| GEOSCAN ID | 328092 |
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