A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability
International audience This paper presents a new annually laminated record (varves) from Lake Walker, Quebec North Shore (eastern Canada) spanning the period from similar to 3230 to 2320 +/- 20 cal BP. A similar to 3.5-m-long composite sequence was established with the best regular and continuous la...
Published in: | Journal of Paleolimnology |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.inrae.fr/hal-03480202 https://doi.org/10.1007/s10933-021-00220-x |
id |
ftunivnantes:oai:HAL:hal-03480202v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Quebec North Shore Laminations Varves Thin-section Image analysis [SDE]Environmental Sciences |
spellingShingle |
Quebec North Shore Laminations Varves Thin-section Image analysis [SDE]Environmental Sciences Nzekwe, Obinna Lapointe, Francois Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe de Coninck, Arnaud Philippe, Édouard 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 |
Quebec North Shore Laminations Varves Thin-section Image analysis [SDE]Environmental Sciences |
description |
International audience This paper presents a new annually laminated record (varves) from Lake Walker, Quebec North Shore (eastern Canada) spanning the period from similar to 3230 to 2320 +/- 20 cal BP. A similar to 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. |
author2 |
Centre Eau Terre Environnement Québec (INRS - ETE) Institut National de la Recherche Scientifique Québec (INRS) University of Massachusetts Dartmouth University of Massachusetts System (UMASS) Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Université du Québec à Rimouski (UQAR) Université Laval Québec (ULaval) Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) University of Saskatchewan Saskatoon (U of S) Institut de Physique du Globe de Paris |
format |
Article in Journal/Newspaper |
author |
Nzekwe, Obinna Lapointe, Francois Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe de Coninck, Arnaud Philippe, Édouard Labarre, Thibault |
author_facet |
Nzekwe, Obinna Lapointe, Francois Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe de Coninck, Arnaud Philippe, Édouard Labarre, Thibault |
author_sort |
Nzekwe, Obinna |
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 |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.inrae.fr/hal-03480202 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_source |
ISSN: 0921-2728 EISSN: 1573-0417 Journal of Paleolimnology https://hal.inrae.fr/hal-03480202 Journal of Paleolimnology, Springer Verlag, 2021, ⟨10.1007/s10933-021-00220-x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10933-021-00220-x hal-03480202 https://hal.inrae.fr/hal-03480202 doi:10.1007/s10933-021-00220-x WOS: 000707543000001 |
op_rights |
http://creativecommons.org/licenses/by/ |
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_ |
1766020036327112704 |
spelling |
ftunivnantes:oai:HAL:hal-03480202v1 2023-05-15T16:30:19+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 Lapointe, Francois Francus, Pierre St-Onge, Guillaume Lajeunesse, Patrick Fortin, David Jenny, Jean-Philippe de Coninck, Arnaud Philippe, Édouard Labarre, Thibault Centre Eau Terre Environnement Québec (INRS - ETE) Institut National de la Recherche Scientifique Québec (INRS) University of Massachusetts Dartmouth University of Massachusetts System (UMASS) Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Université du Québec à Rimouski (UQAR) Université Laval Québec (ULaval) Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) University of Saskatchewan Saskatoon (U of S) Institut de Physique du Globe de Paris 2021 https://hal.inrae.fr/hal-03480202 https://doi.org/10.1007/s10933-021-00220-x en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s10933-021-00220-x hal-03480202 https://hal.inrae.fr/hal-03480202 doi:10.1007/s10933-021-00220-x WOS: 000707543000001 http://creativecommons.org/licenses/by/ ISSN: 0921-2728 EISSN: 1573-0417 Journal of Paleolimnology https://hal.inrae.fr/hal-03480202 Journal of Paleolimnology, Springer Verlag, 2021, ⟨10.1007/s10933-021-00220-x⟩ Quebec North Shore Laminations Varves Thin-section Image analysis [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1007/s10933-021-00220-x 2022-08-10T00:54:10Z International audience This paper presents a new annually laminated record (varves) from Lake Walker, Quebec North Shore (eastern Canada) spanning the period from similar to 3230 to 2320 +/- 20 cal BP. A similar to 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 Université de Nantes: HAL-UNIV-NANTES Canada Greenland New Lake ENVELOPE(-109.468,-109.468,62.684,62.684) Journal of Paleolimnology 67 1 35 57 |