Low oxygen events in the Laurentian Channel during the Holocene
Geochemical and micropaleontological analyses were carried out on a 35 cm box core (CR06-TCE) spanning the last 6000 years in the Esquiman Channel, a northeast arm of the Laurentian Channel in the Gulf of St. Lawrence. A 0.6‰ decrease of δ18O in benthic foraminifer Globobulimina auriculata shells ch...
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Online Access: | https://oceanrep.geomar.de/id/eprint/23102/ https://oceanrep.geomar.de/id/eprint/23102/1/Thibodeau.pdf https://doi.org/10.1016/j.margeo.2013.08.004 |
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ftoceanrep:oai:oceanrep.geomar.de:23102 2023-05-15T17:34:50+02:00 Low oxygen events in the Laurentian Channel during the Holocene Thibodeau, Benoit de Vernal, Anne Limoges, Audrey 2013-12-01 text https://oceanrep.geomar.de/id/eprint/23102/ https://oceanrep.geomar.de/id/eprint/23102/1/Thibodeau.pdf https://doi.org/10.1016/j.margeo.2013.08.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/23102/1/Thibodeau.pdf Thibodeau, B., de Vernal, A. and Limoges, A. (2013) Low oxygen events in the Laurentian Channel during the Holocene. Marine Geology, 346 . pp. 183-191. DOI 10.1016/j.margeo.2013.08.004 <https://doi.org/10.1016/j.margeo.2013.08.004>. doi:10.1016/j.margeo.2013.08.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1016/j.margeo.2013.08.004 2023-04-07T15:11:48Z Geochemical and micropaleontological analyses were carried out on a 35 cm box core (CR06-TCE) spanning the last 6000 years in the Esquiman Channel, a northeast arm of the Laurentian Channel in the Gulf of St. Lawrence. A 0.6‰ decrease of δ18O in benthic foraminifer Globobulimina auriculata shells characterizes the upper 10 cm of the core and suggests a warming of the bottom waters. This change is concomitant with increased percentages of the low-oxygen tolerant benthic foraminifer species Brizalina subaenariensis and the Atlantic water species Oridorsalis umbonatus. Although a precise timing cannot be established, notably because of the smoothing effect of bioturbation, the amplitude of the trend recorded in the Esquiman Channel is coherent with that of the regional warming observed in the bottom water of the main axis of the Laurentian Channel over the last century. Warm bottom water conditions, however, are not exclusive to the recent time interval as shown by data from the lower part of the core, which are also characterized by low δ18O values in G. auriculata and occurrence of both B. subaenariensis and O. umbonatus. Such data suggest the existence of low-oxygen and relatively high temperature conditions in the bottom water of the Esquiman Channel about 4 to 6 kyrs ago likely related to enhanced inflow of Atlantic water in the Gulf of St. Lawrence through the Cabot Strait and the Laurentian Channel. These results highlight the sensitivity of bottom water properties in the Gulf of St. Lawrence to changes in the western North Atlantic circulation. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Cabot ENVELOPE(-54.600,-54.600,-63.383,-63.383) Northeast Arm ENVELOPE(-56.481,-56.481,50.400,50.400) Marine Geology 346 183 191 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Geochemical and micropaleontological analyses were carried out on a 35 cm box core (CR06-TCE) spanning the last 6000 years in the Esquiman Channel, a northeast arm of the Laurentian Channel in the Gulf of St. Lawrence. A 0.6‰ decrease of δ18O in benthic foraminifer Globobulimina auriculata shells characterizes the upper 10 cm of the core and suggests a warming of the bottom waters. This change is concomitant with increased percentages of the low-oxygen tolerant benthic foraminifer species Brizalina subaenariensis and the Atlantic water species Oridorsalis umbonatus. Although a precise timing cannot be established, notably because of the smoothing effect of bioturbation, the amplitude of the trend recorded in the Esquiman Channel is coherent with that of the regional warming observed in the bottom water of the main axis of the Laurentian Channel over the last century. Warm bottom water conditions, however, are not exclusive to the recent time interval as shown by data from the lower part of the core, which are also characterized by low δ18O values in G. auriculata and occurrence of both B. subaenariensis and O. umbonatus. Such data suggest the existence of low-oxygen and relatively high temperature conditions in the bottom water of the Esquiman Channel about 4 to 6 kyrs ago likely related to enhanced inflow of Atlantic water in the Gulf of St. Lawrence through the Cabot Strait and the Laurentian Channel. These results highlight the sensitivity of bottom water properties in the Gulf of St. Lawrence to changes in the western North Atlantic circulation. |
format |
Article in Journal/Newspaper |
author |
Thibodeau, Benoit de Vernal, Anne Limoges, Audrey |
spellingShingle |
Thibodeau, Benoit de Vernal, Anne Limoges, Audrey Low oxygen events in the Laurentian Channel during the Holocene |
author_facet |
Thibodeau, Benoit de Vernal, Anne Limoges, Audrey |
author_sort |
Thibodeau, Benoit |
title |
Low oxygen events in the Laurentian Channel during the Holocene |
title_short |
Low oxygen events in the Laurentian Channel during the Holocene |
title_full |
Low oxygen events in the Laurentian Channel during the Holocene |
title_fullStr |
Low oxygen events in the Laurentian Channel during the Holocene |
title_full_unstemmed |
Low oxygen events in the Laurentian Channel during the Holocene |
title_sort |
low oxygen events in the laurentian channel during the holocene |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/23102/ https://oceanrep.geomar.de/id/eprint/23102/1/Thibodeau.pdf https://doi.org/10.1016/j.margeo.2013.08.004 |
long_lat |
ENVELOPE(-54.600,-54.600,-63.383,-63.383) ENVELOPE(-56.481,-56.481,50.400,50.400) |
geographic |
Cabot Northeast Arm |
geographic_facet |
Cabot Northeast Arm |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/23102/1/Thibodeau.pdf Thibodeau, B., de Vernal, A. and Limoges, A. (2013) Low oxygen events in the Laurentian Channel during the Holocene. Marine Geology, 346 . pp. 183-191. DOI 10.1016/j.margeo.2013.08.004 <https://doi.org/10.1016/j.margeo.2013.08.004>. doi:10.1016/j.margeo.2013.08.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2013.08.004 |
container_title |
Marine Geology |
container_volume |
346 |
container_start_page |
183 |
op_container_end_page |
191 |
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1766133800957378560 |