Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record
International audience The southern westerly winds (SWW) play a major role in climate variability in Southern Hemisphere mid- and high-latitudes, regulating rainfall, ocean circulation, and the Southern Ocean carbon sink. Despite their importance, little is known about millennial scale changes in th...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.science/hal-02895456 https://hal.science/hal-02895456/document https://hal.science/hal-02895456/file/JQSR_2019_258_revised_Li%20et%20al.%20for%20QSR_main_with%20no%20mark.pdf https://doi.org/10.1016/j.quascirev.2020.106169 |
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ftunivnantes:oai:HAL:hal-02895456v1 |
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openpolar |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
southern westerly winds anthropogenic activities Amsterdam Island peat dust sources [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
southern westerly winds anthropogenic activities Amsterdam Island peat dust sources [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Li, Chuxian Sonke, Jeroen, Le Roux, Gaël van Der Putten, Nathalie Piotrowska, Natalia Jeandel, Catherine Mattielli, Nadine Benoit, Mathieu Wiggs, Giles F.S. de Vleeschouwer, François Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
topic_facet |
southern westerly winds anthropogenic activities Amsterdam Island peat dust sources [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The southern westerly winds (SWW) play a major role in climate variability in Southern Hemisphere mid- and high-latitudes, regulating rainfall, ocean circulation, and the Southern Ocean carbon sink. Despite their importance, little is known about millennial scale changes in the SWW and how they have influenced the climate system in the past and interacted with the Earth’s surface elements, such as dust, nutrients and carbon. Here we present a dust record from a 6.6 kyr old peat core in Amsterdam Island (AMS) situated at the northern edge of the SWW (37°S) in the Southern Indian Ocean. Mineral dust flux was used to track atmospheric dust production, long-distance transport and subsequent deposition. Dust provenance was determined from rare earth element (REE) and Nd isotopic signatures (εNd) in the peat core, compared with a reference dataset of Southern Hemisphere dust sources. Using a multi-proxy mixing model, the εNd and REE ratios show a relatively uniform mixture of ca. 40% local, 15% Southern African and 45% Southern South American dust sources since 6.6 cal kyr BP. However, from 1910 AD onwards, there is a doubling in the contribution from Southern Africa (32%). Two mineral dust flux minima occur at 6.2–4.9 cal kyr BP and 3.9–2.7 cal kyr BP, interpreted as periods with equatorward-shifted and/or strengthened SWW at the northern edge of the wind belt. Conversely, periods of higher dust flux at 6.6–6.2 cal kyr BP, 4.9–3.9 cal kyr BP, and 1.4 cal kyr BP onwards are interpreted as poleward-shifted and/or weakened SWW. These interpretations are based on the findings that higher (lower) wind speeds lead to enhanced (less) removal of distal dust on the way to AMS, by wet deposition and turbulence. Published Holocene SWW records at the northern edge of the wind belt (33–41°S) covering South-America, Southern-Africa and Australia, show much variability over the last 6.6 kyr. We suggest this reflects complex regional climate variability in the different SH longitudinal sectors, indicating ... |
author2 |
Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) Institut Ecologie et Environnement (INEE) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) Université Fédérale Toulouse Midi-Pyrénées Géochimie des Isotopes Stables (GIS) Géosciences Environnement Toulouse (GET) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Lund University Lund Silesian University of Technology Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Université libre de Bruxelles (ULB) School of Geography and the Environment Oxford (SoGE) University of Oxford Unité de Recherche Argiles et Paléoclimats Université de Liège |
format |
Article in Journal/Newspaper |
author |
Li, Chuxian Sonke, Jeroen, Le Roux, Gaël van Der Putten, Nathalie Piotrowska, Natalia Jeandel, Catherine Mattielli, Nadine Benoit, Mathieu Wiggs, Giles F.S. de Vleeschouwer, François |
author_facet |
Li, Chuxian Sonke, Jeroen, Le Roux, Gaël van Der Putten, Nathalie Piotrowska, Natalia Jeandel, Catherine Mattielli, Nadine Benoit, Mathieu Wiggs, Giles F.S. de Vleeschouwer, François |
author_sort |
Li, Chuxian |
title |
Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
title_short |
Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
title_full |
Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
title_fullStr |
Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
title_full_unstemmed |
Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record |
title_sort |
holocene dynamics of the southern westerly winds over the indian ocean inferred from a peat dust deposition record |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02895456 https://hal.science/hal-02895456/document https://hal.science/hal-02895456/file/JQSR_2019_258_revised_Li%20et%20al.%20for%20QSR_main_with%20no%20mark.pdf https://doi.org/10.1016/j.quascirev.2020.106169 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Amsterdam Island Southern Ocean |
genre_facet |
Amsterdam Island Southern Ocean |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02895456 Quaternary Science Reviews, 2020, 231, pp.106169. ⟨10.1016/j.quascirev.2020.106169⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106169 hal-02895456 https://hal.science/hal-02895456 https://hal.science/hal-02895456/document https://hal.science/hal-02895456/file/JQSR_2019_258_revised_Li%20et%20al.%20for%20QSR_main_with%20no%20mark.pdf doi:10.1016/j.quascirev.2020.106169 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106169 |
container_title |
Quaternary Science Reviews |
container_volume |
231 |
container_start_page |
106169 |
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1766365116623749120 |
spelling |
ftunivnantes:oai:HAL:hal-02895456v1 2023-05-15T13:22:29+02:00 Holocene dynamics of the southern westerly winds over the Indian Ocean inferred from a peat dust deposition record Li, Chuxian Sonke, Jeroen, Le Roux, Gaël van Der Putten, Nathalie Piotrowska, Natalia Jeandel, Catherine Mattielli, Nadine Benoit, Mathieu Wiggs, Giles F.S. de Vleeschouwer, François Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) Institut Ecologie et Environnement (INEE) Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) Université Fédérale Toulouse Midi-Pyrénées Géochimie des Isotopes Stables (GIS) Géosciences Environnement Toulouse (GET) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Lund University Lund Silesian University of Technology Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) Université libre de Bruxelles (ULB) School of Geography and the Environment Oxford (SoGE) University of Oxford Unité de Recherche Argiles et Paléoclimats Université de Liège 2020 https://hal.science/hal-02895456 https://hal.science/hal-02895456/document https://hal.science/hal-02895456/file/JQSR_2019_258_revised_Li%20et%20al.%20for%20QSR_main_with%20no%20mark.pdf https://doi.org/10.1016/j.quascirev.2020.106169 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2020.106169 hal-02895456 https://hal.science/hal-02895456 https://hal.science/hal-02895456/document https://hal.science/hal-02895456/file/JQSR_2019_258_revised_Li%20et%20al.%20for%20QSR_main_with%20no%20mark.pdf doi:10.1016/j.quascirev.2020.106169 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 Quaternary Science Reviews https://hal.science/hal-02895456 Quaternary Science Reviews, 2020, 231, pp.106169. ⟨10.1016/j.quascirev.2020.106169⟩ southern westerly winds anthropogenic activities Amsterdam Island peat dust sources [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1016/j.quascirev.2020.106169 2023-02-22T04:31:54Z International audience The southern westerly winds (SWW) play a major role in climate variability in Southern Hemisphere mid- and high-latitudes, regulating rainfall, ocean circulation, and the Southern Ocean carbon sink. Despite their importance, little is known about millennial scale changes in the SWW and how they have influenced the climate system in the past and interacted with the Earth’s surface elements, such as dust, nutrients and carbon. Here we present a dust record from a 6.6 kyr old peat core in Amsterdam Island (AMS) situated at the northern edge of the SWW (37°S) in the Southern Indian Ocean. Mineral dust flux was used to track atmospheric dust production, long-distance transport and subsequent deposition. Dust provenance was determined from rare earth element (REE) and Nd isotopic signatures (εNd) in the peat core, compared with a reference dataset of Southern Hemisphere dust sources. Using a multi-proxy mixing model, the εNd and REE ratios show a relatively uniform mixture of ca. 40% local, 15% Southern African and 45% Southern South American dust sources since 6.6 cal kyr BP. However, from 1910 AD onwards, there is a doubling in the contribution from Southern Africa (32%). Two mineral dust flux minima occur at 6.2–4.9 cal kyr BP and 3.9–2.7 cal kyr BP, interpreted as periods with equatorward-shifted and/or strengthened SWW at the northern edge of the wind belt. Conversely, periods of higher dust flux at 6.6–6.2 cal kyr BP, 4.9–3.9 cal kyr BP, and 1.4 cal kyr BP onwards are interpreted as poleward-shifted and/or weakened SWW. These interpretations are based on the findings that higher (lower) wind speeds lead to enhanced (less) removal of distal dust on the way to AMS, by wet deposition and turbulence. Published Holocene SWW records at the northern edge of the wind belt (33–41°S) covering South-America, Southern-Africa and Australia, show much variability over the last 6.6 kyr. We suggest this reflects complex regional climate variability in the different SH longitudinal sectors, indicating ... Article in Journal/Newspaper Amsterdam Island Southern Ocean Université de Nantes: HAL-UNIV-NANTES Indian Southern Ocean Quaternary Science Reviews 231 106169 |