A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability.
This paper presents a new annually laminated record (varves) from Lake Walker, Québec North Shore (eastern Canada) spanning the period from ~ 3230 to 2320 ± 20 cal BP. A ~ 3.5-m-long composite sequence was established with the best regular and continuous laminated intervals using computed tomography...
Published in: | Journal of Paleolimnology |
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Online Access: | https://espace.inrs.ca/id/eprint/12714/ https://doi.org/10.1007/s10933-021-00220-x |
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ftinrsquebec:oai:espace.inrs.ca:12714 2023-05-15T16:30:07+02:00 A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. Nzekwe, Obinna Peter Lapointe, François Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe De Coninck, Arnaud Philippe, Édouard G. H. Labarre, Thibault 2022 https://espace.inrs.ca/id/eprint/12714/ https://doi.org/10.1007/s10933-021-00220-x unknown Nzekwe, Obinna Peter, Lapointe, François, Francus, Pierre orcid:0000-0001-5465-1966 , St-Onge, Guillaume, Lajeunesse, Patrick, Fortin, David, Jenny, Jean-Philippe, De Coninck, Arnaud, Philippe, Édouard G. H. et Labarre, Thibault (2022). A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. Journal of Paleolimnology , vol. 67 , nº 1. p. 35-57. DOI:10.1007/s10933-021-00220-x <https://doi.org/10.1007/s10933-021-00220-x>. doi:10.1007/s10933-021-00220-x image analysis laminations Québec North Shore thin-section varves Article Évalué par les pairs 2022 ftinrsquebec https://doi.org/10.1007/s10933-021-00220-x 2023-02-10T11:47:23Z This paper presents a new annually laminated record (varves) from Lake Walker, Québec North Shore (eastern Canada) spanning the period from ~ 3230 to 2320 ± 20 cal BP. A ~ 3.5-m-long composite sequence was established with the best regular and continuous laminated intervals using computed tomography and high-resolution photographs. The varve chronology was built based on two methods: manual multi-parameter counting using the PeakCounter software, and manual counting on thin-section images obtained by scanning electron microscopy (SEM). The latter correlates more closely with the ages derived from AMS radiocarbon dating, suggesting that thin-section analysis is here a more reliable counting technique. Varves are clastic, composed of a silt layer deposited in spring and summer, and a clay layer deposited in winter. Annually resolved grain size obtained using image analysis technique on SEM images of thin sections and elemental composition from X-ray microfluorescence analyses performed on the floating varve chronology suggests that the record is sensitive to the North Atlantic Oscillation (NAO), as revealed by the strong co-variability with another lower resolution record from Greenland. This suggests that periods of negative winter NAO promoted a thicker snow cover that resulted in higher river discharges and stronger clastic component in the varves. In modern times, cooling of the North Atlantic in the mid 1970s to the late 1980s was also characterized by concurrent negative phase of NAO, which condition translated into increase snow precipitation over the region. Overall, these results highlight that the new Lake Walker varve record presents remarkable prospects of developing a longer and high-resolution paleoclimatological reconstruction of the NAO in a region where similar records are scarce. Article in Journal/Newspaper Greenland North Atlantic North Atlantic oscillation Institut national de la recherche scientifique, Québec: Espace INRS Canada Greenland New Lake ENVELOPE(-109.468,-109.468,62.684,62.684) Journal of Paleolimnology 67 1 35 57 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
unknown |
topic |
image analysis laminations Québec North Shore thin-section varves |
spellingShingle |
image analysis laminations Québec North Shore thin-section varves Nzekwe, Obinna Peter Lapointe, François Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe De Coninck, Arnaud Philippe, Édouard G. H. Labarre, Thibault A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
topic_facet |
image analysis laminations Québec North Shore thin-section varves |
description |
This paper presents a new annually laminated record (varves) from Lake Walker, Québec North Shore (eastern Canada) spanning the period from ~ 3230 to 2320 ± 20 cal BP. A ~ 3.5-m-long composite sequence was established with the best regular and continuous laminated intervals using computed tomography and high-resolution photographs. The varve chronology was built based on two methods: manual multi-parameter counting using the PeakCounter software, and manual counting on thin-section images obtained by scanning electron microscopy (SEM). The latter correlates more closely with the ages derived from AMS radiocarbon dating, suggesting that thin-section analysis is here a more reliable counting technique. Varves are clastic, composed of a silt layer deposited in spring and summer, and a clay layer deposited in winter. Annually resolved grain size obtained using image analysis technique on SEM images of thin sections and elemental composition from X-ray microfluorescence analyses performed on the floating varve chronology suggests that the record is sensitive to the North Atlantic Oscillation (NAO), as revealed by the strong co-variability with another lower resolution record from Greenland. This suggests that periods of negative winter NAO promoted a thicker snow cover that resulted in higher river discharges and stronger clastic component in the varves. In modern times, cooling of the North Atlantic in the mid 1970s to the late 1980s was also characterized by concurrent negative phase of NAO, which condition translated into increase snow precipitation over the region. Overall, these results highlight that the new Lake Walker varve record presents remarkable prospects of developing a longer and high-resolution paleoclimatological reconstruction of the NAO in a region where similar records are scarce. |
format |
Article in Journal/Newspaper |
author |
Nzekwe, Obinna Peter Lapointe, François Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe De Coninck, Arnaud Philippe, Édouard G. H. Labarre, Thibault |
author_facet |
Nzekwe, Obinna Peter Lapointe, François Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe De Coninck, Arnaud Philippe, Édouard G. H. Labarre, Thibault |
author_sort |
Nzekwe, Obinna Peter |
title |
A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
title_short |
A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
title_full |
A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
title_fullStr |
A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
title_full_unstemmed |
A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. |
title_sort |
new ~ 900-year varved record in lake walker, québec north shore, eastern canada: insight on late holocene climate mode of variability. |
publishDate |
2022 |
url |
https://espace.inrs.ca/id/eprint/12714/ https://doi.org/10.1007/s10933-021-00220-x |
long_lat |
ENVELOPE(-109.468,-109.468,62.684,62.684) |
geographic |
Canada Greenland New Lake |
geographic_facet |
Canada Greenland New Lake |
genre |
Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland North Atlantic North Atlantic oscillation |
op_relation |
Nzekwe, Obinna Peter, Lapointe, François, Francus, Pierre orcid:0000-0001-5465-1966 , St-Onge, Guillaume, Lajeunesse, Patrick, Fortin, David, Jenny, Jean-Philippe, De Coninck, Arnaud, Philippe, Édouard G. H. et Labarre, Thibault (2022). A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. Journal of Paleolimnology , vol. 67 , nº 1. p. 35-57. DOI:10.1007/s10933-021-00220-x <https://doi.org/10.1007/s10933-021-00220-x>. doi:10.1007/s10933-021-00220-x |
op_doi |
https://doi.org/10.1007/s10933-021-00220-x |
container_title |
Journal of Paleolimnology |
container_volume |
67 |
container_issue |
1 |
container_start_page |
35 |
op_container_end_page |
57 |
_version_ |
1766019827009323008 |