Articles | Volume 17, issue 2
https://doi.org/10.5194/cp-17-653-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-17-653-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Reconstructing past hydrology of eastern Canadian boreal catchments using clastic varved sediments and hydro-climatic modelling: 160 years of fluvial inflows
Antoine Gagnon-Poiré
CORRESPONDING AUTHOR
Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, QC, Canada
Geotop, Research Centre on the Dynamics of the Earth System, Montréal, QC, Canada
Centre d'études nordiques, Québec, QC, Canada
Pierre Brigode
Université Côte d'Azur, CNRS, OCA, IRD, Géoazur, Nice, Alpes-Maritimes, France
Pierre Francus
Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, QC, Canada
Geotop, Research Centre on the Dynamics of the Earth System, Montréal, QC, Canada
Centre d'études nordiques, Québec, QC, Canada
David Fortin
Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, QC, Canada
Department of Geography and Planning, University of Saskatchewan, Saskatoon, SK, Canada
Patrick Lajeunesse
Département de géographie, Université Laval, Québec, QC, Canada
Hugues Dorion
Département de géographie, Université Laval, Québec, QC, Canada
Annie-Pier Trottier
Département de géographie, Université Laval, Québec, QC, Canada
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A new 1500-year-long sediment record made of annual laminations (varves) from Grand Lake, Labrador, reveals past hydroclimatic conditions. The Medieval Climate Anomaly (~1050–1225 CE) had thicker varves indicating more precipitation, while the Little Ice Age (1400–1875 CE) had thinner varves, suggesting a dryer climate. Teleconnections show that Grand Lake is influenced by winter North Atlantic Oscillation (NAO), hence making this record a promising candidate for future NAO reconstructions.
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This article presents a non-destructive method for studying laminated sediments with X-ray micro-computed tomography (μCT). It aims to study the possibility of using μCT as an analytical tool to analyse varved sediments in the context of paleoclimatic studies. As a result, µCT offers the possibility of doing fast analysis and constitutes a powerful tool to improve the quality of results through the access of a 3D view, allowing for choosing the most representative part of a varved record.
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This study explores storm patterns in eastern Canada's Magdalen Islands over 4000 years, using coastal peatlands to understand past storm activity. Our findings reveal key storm periods, including during the Little Ice Age, linked to broader climatic shifts like the Atlantic Multidecadal Variability. By comparing our results with other North American records, we show how peat data can complement marine storm archives and improve our understanding of past storms.
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This paper presents a dataset acquired during a research cruise held in Baffin Bay in 2016. We observed that the disappearance of sea ice in the Arctic Ocean increases both the length and spatial extent of the phytoplankton growth season. In the future, this will impact the food webs on which the local populations depend for their food supply and fisheries. This dataset will provide insight into quantifying these impacts and help the decision-making process for policymakers.
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Short summary
A very high quality 160-year-long annually laminated (varved) sediment sequence of fluvial origin was recently discovered in an especially deep lake in Labrador. Each varve represents 1 hydrological year. A significant relation between varves' physical parameters (i.e., thickness and grain size extracted from each annual lamination) and river discharge instrumental observations provided the opportunity to develop regional discharge reconstructions beyond the instrumental period.
A very high quality 160-year-long annually laminated (varved) sediment sequence of fluvial...