Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene

International audience In the modern northern Indian Ocean, biological productivity is intimately linked to near-surface oceanographic dynamics forced by the South Asian, or Indian, monsoon. In the late Pleistocene, this strong seasonal signal is transferred to the sedimentary record in the form of...

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Published in:Climate of the Past
Main Authors: Bolton, Clara T., Gray, Emmeline, Kuhnt, Wolfgang, Holbourn, Ann E., Lübbers, Julia, Grant, Katharine, Kazuyo, Tachikawa, Marino, Gianluca, Rohling, Eelco J., Sarr, Anta-Clarisse, Andersen, Nils
Other Authors: Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institute of Geosciences, University of Kiel, Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel (CAU), Australian National University (ANU), Universidade de Vigo, University of Southampton, Leibniz Institute of Marine Science at the University of Kiel (IFM-GEOMAR), ANR-16-CE01-0004,iMonsoon,Forçages et rétroactions de la mousson dans un climat chaud(2016)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2022
Subjects:
Online Access:https://insu.hal.science/insu-03661014
https://insu.hal.science/insu-03661014/document
https://insu.hal.science/insu-03661014/file/cp-18-713-2022.pdf
https://doi.org/10.5194/cp-18-713-2022
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institution Open Polar
collection Collège de France: HAL
op_collection_id ftcollegfrance
language English
topic [SDU]Sciences of the Universe [physics]
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
spellingShingle [SDU]Sciences of the Universe [physics]
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Bolton, Clara T.
Gray, Emmeline
Kuhnt, Wolfgang
Holbourn, Ann E.
Lübbers, Julia
Grant, Katharine
Kazuyo, Tachikawa
Marino, Gianluca
Rohling, Eelco J.
Sarr, Anta-Clarisse
Andersen, Nils
Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
topic_facet [SDU]Sciences of the Universe [physics]
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
description International audience In the modern northern Indian Ocean, biological productivity is intimately linked to near-surface oceanographic dynamics forced by the South Asian, or Indian, monsoon. In the late Pleistocene, this strong seasonal signal is transferred to the sedimentary record in the form of strong variance in the precession band (19-23 kyr), because precession dominates low-latitude insolation variations and drives seasonal contrast in oceanographic conditions. In addition, internal climate system feedbacks (e.g. ice-sheet albedo, carbon cycle, topography) play a key role in monsoon variability. Little is known about orbital-scale monsoon variability in the pre-Pleistocene, when atmospheric CO 2 levels and global temperatures were higher. In addition, many questions remain open regarding the timing of the initiation and intensification of the South Asian monsoon during the Miocene, an interval of significant global climate change that culminated in bipolar glaciation. Here, we present new high-resolution (<1 kyr) records of export productivity and sediment accumulation from International Ocean Discovery Program Site U1443 in the southernmost part of the Bay of Bengal spanning the late Miocene (9 to 5 million years ago). Underpinned by a new orbitally tuned benthic isotope stratigraphy, we use X-ray fluorescence-derived biogenic barium variations to discern productivity trends and rhythms. Results show strong eccentricity-modulated precession-band productivity variations throughout the late Miocene, interpreted to reflect insolation forcing of summer monsoon wind strength in the equatorial Indian Ocean. On long timescales, our data support the interpretation that South Asian monsoon winds were already established by 9 Ma in the equatorial sector of the Indian Ocean, with no apparent intensification over the latest Miocene.
author2 Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE)
Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
Institute of Geosciences, University of Kiel
Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel (CAU)
Australian National University (ANU)
Universidade de Vigo
University of Southampton
Leibniz Institute of Marine Science at the University of Kiel (IFM-GEOMAR)
ANR-16-CE01-0004,iMonsoon,Forçages et rétroactions de la mousson dans un climat chaud(2016)
format Article in Journal/Newspaper
author Bolton, Clara T.
Gray, Emmeline
Kuhnt, Wolfgang
Holbourn, Ann E.
Lübbers, Julia
Grant, Katharine
Kazuyo, Tachikawa
Marino, Gianluca
Rohling, Eelco J.
Sarr, Anta-Clarisse
Andersen, Nils
author_facet Bolton, Clara T.
Gray, Emmeline
Kuhnt, Wolfgang
Holbourn, Ann E.
Lübbers, Julia
Grant, Katharine
Kazuyo, Tachikawa
Marino, Gianluca
Rohling, Eelco J.
Sarr, Anta-Clarisse
Andersen, Nils
author_sort Bolton, Clara T.
title Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
title_short Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
title_full Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
title_fullStr Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
title_full_unstemmed Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene
title_sort secular and orbital-scale variability of equatorial indian ocean summer monsoon winds during the late miocene
publisher HAL CCSD
publishDate 2022
url https://insu.hal.science/insu-03661014
https://insu.hal.science/insu-03661014/document
https://insu.hal.science/insu-03661014/file/cp-18-713-2022.pdf
https://doi.org/10.5194/cp-18-713-2022
geographic Indian
geographic_facet Indian
genre Ice Sheet
genre_facet Ice Sheet
op_source Climate of the Past
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spelling ftcollegfrance:oai:HAL:insu-03661014v1 2024-06-23T07:53:50+00:00 Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene Bolton, Clara T. Gray, Emmeline Kuhnt, Wolfgang Holbourn, Ann E. Lübbers, Julia Grant, Katharine Kazuyo, Tachikawa Marino, Gianluca Rohling, Eelco J. Sarr, Anta-Clarisse Andersen, Nils Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Institute of Geosciences, University of Kiel Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel (CAU) Australian National University (ANU) Universidade de Vigo University of Southampton Leibniz Institute of Marine Science at the University of Kiel (IFM-GEOMAR) ANR-16-CE01-0004,iMonsoon,Forçages et rétroactions de la mousson dans un climat chaud(2016) 2022 https://insu.hal.science/insu-03661014 https://insu.hal.science/insu-03661014/document https://insu.hal.science/insu-03661014/file/cp-18-713-2022.pdf https://doi.org/10.5194/cp-18-713-2022 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-18-713-2022 insu-03661014 https://insu.hal.science/insu-03661014 https://insu.hal.science/insu-03661014/document https://insu.hal.science/insu-03661014/file/cp-18-713-2022.pdf BIBCODE: 2022CliPa.18.713B doi:10.5194/cp-18-713-2022 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess Climate of the Past https://insu.hal.science/insu-03661014 Climate of the Past, 2022, 18, pp.713-738. &#x27E8;10.5194/cp-18-713-2022&#x27E9; [SDU]Sciences of the Universe [physics] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2022 ftcollegfrance https://doi.org/10.5194/cp-18-713-2022 2024-06-13T23:36:40Z International audience In the modern northern Indian Ocean, biological productivity is intimately linked to near-surface oceanographic dynamics forced by the South Asian, or Indian, monsoon. In the late Pleistocene, this strong seasonal signal is transferred to the sedimentary record in the form of strong variance in the precession band (19-23 kyr), because precession dominates low-latitude insolation variations and drives seasonal contrast in oceanographic conditions. In addition, internal climate system feedbacks (e.g. ice-sheet albedo, carbon cycle, topography) play a key role in monsoon variability. Little is known about orbital-scale monsoon variability in the pre-Pleistocene, when atmospheric CO 2 levels and global temperatures were higher. In addition, many questions remain open regarding the timing of the initiation and intensification of the South Asian monsoon during the Miocene, an interval of significant global climate change that culminated in bipolar glaciation. Here, we present new high-resolution (<1 kyr) records of export productivity and sediment accumulation from International Ocean Discovery Program Site U1443 in the southernmost part of the Bay of Bengal spanning the late Miocene (9 to 5 million years ago). Underpinned by a new orbitally tuned benthic isotope stratigraphy, we use X-ray fluorescence-derived biogenic barium variations to discern productivity trends and rhythms. Results show strong eccentricity-modulated precession-band productivity variations throughout the late Miocene, interpreted to reflect insolation forcing of summer monsoon wind strength in the equatorial Indian Ocean. On long timescales, our data support the interpretation that South Asian monsoon winds were already established by 9 Ma in the equatorial sector of the Indian Ocean, with no apparent intensification over the latest Miocene. Article in Journal/Newspaper Ice Sheet Collège de France: HAL Indian Climate of the Past 18 4 713 738