Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium
The impact of human activities on Earth's climate is still subject to debate and the pattern of a sharp recent global temperature increase contrasting with much lesser variable temperatures during preceding centuries has often been challenged, partly due to the lack of unquestionable evidence....
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ftarchimer:oai:archimer.ifremer.fr:34176 2023-05-15T17:29:55+02:00 Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium Thibodeau, Benoit De Vernal, Anne Hillaire-marcel, Claude Mucci, Alfonso 2010-09 application/pdf https://archimer.ifremer.fr/doc/00231/34176/32910.pdf https://doi.org/10.1029/2010GL044771 https://archimer.ifremer.fr/doc/00231/34176/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00231/34176/32910.pdf doi:10.1029/2010GL044771 https://archimer.ifremer.fr/doc/00231/34176/ Copyright 2010 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2010-09 , Vol. 37 , N. 17 / L1760 , P. 1-5 text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.1029/2010GL044771 2021-09-23T20:25:14Z The impact of human activities on Earth's climate is still subject to debate and the pattern of a sharp recent global temperature increase contrasting with much lesser variable temperatures during preceding centuries has often been challenged, partly due to the lack of unquestionable evidence. In this paper, oxygen isotope compositions of benthic foraminifer shells recovered from sediments of the Lower St. Lawrence Estuary and the Gulf are used to reconstruct temperature changes in a water mass originating from similar to 400 m deep North Atlantic waters. The data demonstrate that the 1.7 +/- 0.3 degrees C warming measured during the last century corresponds to a delta(18)O shift of 0.4 +/- 0.05 parts per thousand, encompassing the temperature effect and related change in the isotopic composition of the corresponding water mass. In contrast, d18O values remained nearly constant over the last millennium, except for a small positive shift which we attribute to the Little Ice Age. We conclude that the 20th century warming of the incoming intermediate North Atlantic water has had no equivalent during the last thousand years. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Geophysical Research Letters 37 17 n/a n/a |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
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ftarchimer |
language |
English |
description |
The impact of human activities on Earth's climate is still subject to debate and the pattern of a sharp recent global temperature increase contrasting with much lesser variable temperatures during preceding centuries has often been challenged, partly due to the lack of unquestionable evidence. In this paper, oxygen isotope compositions of benthic foraminifer shells recovered from sediments of the Lower St. Lawrence Estuary and the Gulf are used to reconstruct temperature changes in a water mass originating from similar to 400 m deep North Atlantic waters. The data demonstrate that the 1.7 +/- 0.3 degrees C warming measured during the last century corresponds to a delta(18)O shift of 0.4 +/- 0.05 parts per thousand, encompassing the temperature effect and related change in the isotopic composition of the corresponding water mass. In contrast, d18O values remained nearly constant over the last millennium, except for a small positive shift which we attribute to the Little Ice Age. We conclude that the 20th century warming of the incoming intermediate North Atlantic water has had no equivalent during the last thousand years. |
format |
Article in Journal/Newspaper |
author |
Thibodeau, Benoit De Vernal, Anne Hillaire-marcel, Claude Mucci, Alfonso |
spellingShingle |
Thibodeau, Benoit De Vernal, Anne Hillaire-marcel, Claude Mucci, Alfonso Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
author_facet |
Thibodeau, Benoit De Vernal, Anne Hillaire-marcel, Claude Mucci, Alfonso |
author_sort |
Thibodeau, Benoit |
title |
Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
title_short |
Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
title_full |
Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
title_fullStr |
Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
title_full_unstemmed |
Twentieth century warming in deep waters of the Gulf of St. Lawrence: A unique feature of the last millennium |
title_sort |
twentieth century warming in deep waters of the gulf of st. lawrence: a unique feature of the last millennium |
publisher |
Amer Geophysical Union |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00231/34176/32910.pdf https://doi.org/10.1029/2010GL044771 https://archimer.ifremer.fr/doc/00231/34176/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2010-09 , Vol. 37 , N. 17 / L1760 , P. 1-5 |
op_relation |
https://archimer.ifremer.fr/doc/00231/34176/32910.pdf doi:10.1029/2010GL044771 https://archimer.ifremer.fr/doc/00231/34176/ |
op_rights |
Copyright 2010 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2010GL044771 |
container_title |
Geophysical Research Letters |
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37 |
container_issue |
17 |
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1766125161177677824 |