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TitleCarbon and oxygen isotopes of lakeshore black spruce trees in northeastern Canada as proxies for climatic reconstruction
AuthorNaulier, M; Savard, M M; Bégin, C; Marion, J; Arsenault, D; Bégin, Y
SourceChemical Geology vol. 374-375, 2014 p. 37-43,
Alt SeriesEarth Sciences Sector, Contribution Series 20130264
Mediapaper; on-line; digital
File formatpdf
NTS12D; 12E; 12L; 12M; 13D; 13E; 13L; 13M; 14D; 22; 23; 24A; 24B; 24C; 24D; 32A; 32B; 32C; 32D/01; 32D/02; 32D/07; 32D/08; 32D/09; 32D/10; 32D/15; 32D/16; 32E/01; 32E/02; 32E/07; 32E/08; 32E/09; 32E/10; 32E/15; 32E/16; 32F; 32G; 32H; 32I; 32J; 32K; 32L/01; 32L/02; 32L/07; 32L/08; 32L/09; 32L/10; 32L/15; 32L/16; 32M/01; 32M/02; 32M/07; 32M/08; 32M/09; 32M/10; 32M/15; 32M/16; 32N; 32O; 32P; 33A; 33B; 33C; 33D/01; 33D/02; 33D/07; 33D/08; 33D/09; 33D/10; 33D/15; 33D/16; 33E/01; 33E/02; 33E/07; 33E/08; 33E/09; 33E/10; 33E/15; 33E/16; 33F; 33G; 33H; 33I; 33J; 33K; 33L/01; 33L/02; 33L/07; 33L/08; 33L/09; 33L/10; 33L/15; 33L/16; 33M/01; 33N/02; 33N/03; 33N/04; 33N/05; 33N/06; 33N/07; 33N/08; 33N/09; 33N/10; 33N/11; 33N/15; 33N/16; 33O; 33P; 34A; 34B; 34C/01; 34C/02; 34C/07; 34C/08; 34C/09; 34C/16
AreaNitchequon; Schefferville; Wabush
Lat/Long WENS -79.0000 -62.0000 57.0000 48.0000
Subjectsgeochronology; environmental geology; isotopes; isotope ratios; stable isotope studies; dendrochronology; climatology; climate; climatic fluctuations; vegetation; carbon isotopes; oxygen isotopes
Illustrationslocation maps; tables; plots
ProgramCoal & Oil Resources Environmental Sustainability, Environmental Geoscience
AbstractIn the boreal zone of northeastern Canada, paleoclimatic reconstructions of millennial length are rare and long isotopic climatic records are unavailable. However, millennial tree-ring series could be constructed within the region by cross-dating sub-fossil stems preserved in the littoral part of lakes. Thus, there is a need to evaluate the potential of using stable isotopes of lakeshore black spruce trees (Picea mariana [Mill] B.S.P.) as proxies for climatic reconstruction. We collected four living riparian black spruce trees and we investigated the inter- and intra-tree correlations for four trees, at two different sampling heights (1 and 4 m), for their carbon (d13C) and oxygen (d18O) isotopes, as a test for potential long-term reconstruction. A significant correlation (Pearson coefficient) for the isotopic series was found for the two sampling heights (r = 0.92 for d13C; 0.65 for d18O), and between the four trees. We further assessed the climatic significance of the mean of the four trees. The strongest correlation of the d13C series was with the mean of June to August vapor pressure deficit (VPD; r = 0.50), and the d18O values with the June to August climatic index and June to July maximal temperature (r = - 0.61 and 0.55, respectively). This study suggests that d18O series of riparian black spruce trees, and eventually their sub-fossil counterparts, can be used as proxies for reconstructing long climatic series in northeastern Canada.
Summary(Plain Language Summary, not published)
The extending to the past the information on climatic conditions is a prerequisite for all pollution studies using the natural archive systems such as series of growth rings. This type of information and the elaborate methodology to generate it are the subject of research development specifically regarding sub-sampling and statistical analysis used for reconstruction of climate. The present work demonstrates that the isotopic series of lakeshore trees of boreal lakes clearly respond to local climatic conditions. The stems of these trees eventually settle on the lake bottom, and even if the fallen stem segments are from different heights, they can be used to reconstruct climate over centuries, even millennia, and thus address the lack of knowledge in this field in Canada. The conditions and extent of natural changes will enable to better understand the effects of human activities on climate and even the nitrogen cycle in populated areas.