Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals
International audience The Nd isotopic composition of the aragonite skeleton of fossil deep-sea corals (Lophelia pertusa, Madrepora oculata and Desmophyllum dianthus) located in the northeastern Atlantic at water depths between 635 and 1300 m was investigated to reconstruct changes in the Atlantic m...
Published in: | Earth and Planetary Science Letters |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2012
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Online Access: | https://hal.science/hal-00674904 https://doi.org/10.1016/j.epsl.2011.09.047 |
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ftunivnantes:oai:HAL:hal-00674904v1 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
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English |
topic |
Panoply [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Panoply [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Copard, K. Colin, Christophe Henderson, G.S. Scholten, J. Douville, E. Sicre, Marie-Alexandrine Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
topic_facet |
Panoply [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Nd isotopic composition of the aragonite skeleton of fossil deep-sea corals (Lophelia pertusa, Madrepora oculata and Desmophyllum dianthus) located in the northeastern Atlantic at water depths between 635 and 1300 m was investigated to reconstruct changes in the Atlantic mid-depth gyre circulation during the past millennium. The coral εNd values varied systematically from − 11.8 to − 14.4 during the past 1500 years, reflecting variations in seawater εNd and thus water mass provenance. Low εNd values (εNd = − 14) occurred during the warm Medieval Climatic Anomaly (MCA) (between 1000 AD and 1250 AD) and during the most recent period (1950 AD to 2000 AD), interrupted by a period of significantly higher εNd values (~−12.5) during the Little Ice Age (LIA) (between 1350 AD and 1850 AD). One long-lived branching coral even recorded an abrupt systematic rise from low to high εNd values around 1250 AD over the course of its 10-year growth period. These variations are interpreted to result from variable contributions of the subpolar and subtropical Atlantic intermediate water masses, which today are characterized by εNd values of − 15 and ~−11, respectively. The low εNd values observed during the warm MCA and during recent times imply a strong eastward extension of the mid-depth subpolar gyre (SPG) induced by a dominant positive phase of the North Atlantic oscillation (NAO). During the LIA, water from the subtropical gyre (STG) and potentially from the Mediterranean Sea Water (MSW) propagated further northward, as indicated by the higher coral εNd values. This pattern suggests a negative mean state of the NAO during the LIA, with weaker and more southerly located Westerlies and a westward contraction of the SPG. Variations in the contributions of the two gyres imply changes in the heat and salt budgets at intermediate depths during the past millennia that may have contributed to changes in the properties of North Atlantic inflow into the Nordic Seas and thus deep-water formation. --- |
author2 |
Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geology University of Toronto Marine Environment Laboratories AIEA Géochrononologie Traceurs Archéométrie (GEOTRAC) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Paléocéanographie (PALEOCEAN) |
format |
Article in Journal/Newspaper |
author |
Copard, K. Colin, Christophe Henderson, G.S. Scholten, J. Douville, E. Sicre, Marie-Alexandrine |
author_facet |
Copard, K. Colin, Christophe Henderson, G.S. Scholten, J. Douville, E. Sicre, Marie-Alexandrine |
author_sort |
Copard, K. |
title |
Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
title_short |
Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
title_full |
Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
title_fullStr |
Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
title_full_unstemmed |
Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals |
title_sort |
late holocene intermediate water variability in the northeastern atlantic as recorded by deep-sea corals |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-00674904 https://doi.org/10.1016/j.epsl.2011.09.047 |
genre |
Lophelia pertusa Nordic Seas North Atlantic North Atlantic oscillation |
genre_facet |
Lophelia pertusa Nordic Seas North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-00674904 Earth and Planetary Science Letters, 2012, 313-314, pp.34-44. ⟨10.1016/j.epsl.2011.09.047⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.09.047 hal-00674904 https://hal.science/hal-00674904 doi:10.1016/j.epsl.2011.09.047 WOS: 000301203800004 |
op_doi |
https://doi.org/10.1016/j.epsl.2011.09.047 |
container_title |
Earth and Planetary Science Letters |
container_volume |
313-314 |
container_start_page |
34 |
op_container_end_page |
44 |
_version_ |
1766064693948973056 |
spelling |
ftunivnantes:oai:HAL:hal-00674904v1 2023-05-15T17:08:49+02:00 Late Holocene intermediate water variability in the northeastern Atlantic as recorded by deep-sea corals Copard, K. Colin, Christophe Henderson, G.S. Scholten, J. Douville, E. Sicre, Marie-Alexandrine Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geology University of Toronto Marine Environment Laboratories AIEA Géochrononologie Traceurs Archéométrie (GEOTRAC) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Paléocéanographie (PALEOCEAN) 2012 https://hal.science/hal-00674904 https://doi.org/10.1016/j.epsl.2011.09.047 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.09.047 hal-00674904 https://hal.science/hal-00674904 doi:10.1016/j.epsl.2011.09.047 WOS: 000301203800004 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-00674904 Earth and Planetary Science Letters, 2012, 313-314, pp.34-44. ⟨10.1016/j.epsl.2011.09.047⟩ Panoply [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftunivnantes https://doi.org/10.1016/j.epsl.2011.09.047 2023-03-08T00:12:55Z International audience The Nd isotopic composition of the aragonite skeleton of fossil deep-sea corals (Lophelia pertusa, Madrepora oculata and Desmophyllum dianthus) located in the northeastern Atlantic at water depths between 635 and 1300 m was investigated to reconstruct changes in the Atlantic mid-depth gyre circulation during the past millennium. The coral εNd values varied systematically from − 11.8 to − 14.4 during the past 1500 years, reflecting variations in seawater εNd and thus water mass provenance. Low εNd values (εNd = − 14) occurred during the warm Medieval Climatic Anomaly (MCA) (between 1000 AD and 1250 AD) and during the most recent period (1950 AD to 2000 AD), interrupted by a period of significantly higher εNd values (~−12.5) during the Little Ice Age (LIA) (between 1350 AD and 1850 AD). One long-lived branching coral even recorded an abrupt systematic rise from low to high εNd values around 1250 AD over the course of its 10-year growth period. These variations are interpreted to result from variable contributions of the subpolar and subtropical Atlantic intermediate water masses, which today are characterized by εNd values of − 15 and ~−11, respectively. The low εNd values observed during the warm MCA and during recent times imply a strong eastward extension of the mid-depth subpolar gyre (SPG) induced by a dominant positive phase of the North Atlantic oscillation (NAO). During the LIA, water from the subtropical gyre (STG) and potentially from the Mediterranean Sea Water (MSW) propagated further northward, as indicated by the higher coral εNd values. This pattern suggests a negative mean state of the NAO during the LIA, with weaker and more southerly located Westerlies and a westward contraction of the SPG. Variations in the contributions of the two gyres imply changes in the heat and salt budgets at intermediate depths during the past millennia that may have contributed to changes in the properties of North Atlantic inflow into the Nordic Seas and thus deep-water formation. --- Article in Journal/Newspaper Lophelia pertusa Nordic Seas North Atlantic North Atlantic oscillation Université de Nantes: HAL-UNIV-NANTES Earth and Planetary Science Letters 313-314 34 44 |