A.S. Dalton
Late Holocene climatic variability in Subarctic Canada: Insights from a high-resolution lake record from the central Northwest Territories
Dalton, A.S.; Patterson, R.T.; Roe, H.M.; Macumber, A.L.; Swindles, G.T.; Galloway, J.M.; Vermaire, J.C.; Crann, C.A.; Falck, H.
Authors
R.T. Patterson
H.M. Roe
A.L. Macumber
G.T. Swindles
J.M. Galloway
J.C. Vermaire
C.A. Crann
H. Falck
Abstract
We examined late Holocene (ca. 3300 yr BP to present-day) climate variability in the central Northwest Territories (Canadian Subarctic) using a diatom and sedimentological record from Danny’s Lake (63.48ºN, 112.54ºW), located 40 km southwest of the modern-day treeline. High-resolution sampling paired with a robust age model (25 radiocarbon dates) allowed for the examination of both lake hydroecological conditions (30-year intervals; diatoms) and sedimentological changes in the watershed (12-year intervals; grain size records) over the late Holocene. Time series analysis of key lake ecological indicators (diatom species Aulacoseira alpigena, Pseudostaurosira brevistriata and Achnanthidium minutissimum) and sedimentological parameters, reflective of catchment processes (coarse silt fraction), suggests significant intermittent variations in turbidity, pH and light penetration within the lake basin. In the diatom record, we observed discontinuous periodicities in the range of ca. 69, 88–100, 115–132, 141–188, 562, 750 and 900 years (>90% and >95% confidence intervals), whereas the coarse silt fraction was characterized by periodicities in the >901 and <61-year range (>95% confidence interval). Periodicities in the proxy data from the Danny’s Lake sediment core align with changes in total solar irradiance over the past ca. 3300 yr BP and we hypothesize a link to the Suess Cycle, Gleissberg Cycle and Pacific Decadal Oscillation via occasional inland propagation of shifting air masses over the Pacific Ocean. This research represents an important baseline study of the underlying causes of climate variability in the Canadian Subarctic and provides details on the long-term climate variability that has persisted in this region through the past three thousand years.
Citation
Dalton, A., Patterson, R., Roe, H., Macumber, A., Swindles, G., Galloway, J., …Falck, H. (2018). Late Holocene climatic variability in Subarctic Canada: Insights from a high-resolution lake record from the central Northwest Territories. PLoS ONE, 13(6), Article e0199872. https://doi.org/10.1371/journal.pone.0199872
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 15, 2018 |
Online Publication Date | Jun 28, 2018 |
Publication Date | Jun 28, 2018 |
Deposit Date | Aug 13, 2018 |
Publicly Available Date | Aug 14, 2018 |
Journal | PLoS ONE |
Publisher | Public Library of Science |
Peer Reviewed | Peer Reviewed |
Volume | 13 |
Issue | 6 |
Article Number | e0199872 |
DOI | https://doi.org/10.1371/journal.pone.0199872 |
Files
Published Journal Article
(3.8 Mb)
PDF
Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
© 2018 Dalton et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
You might also like
The configuration of Northern Hemisphere ice sheets through the Quaternary
(2019)
Journal Article
Widespread global peatland establishment and persistence over the last 130,000 y
(2019)
Journal Article
Was the Laurentide Ice Sheet significantly reduced during Marine Isotope Stage 3
(2019)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search