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Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma

The evolution and driving mechanism of the South Asian summer monsoon (SASM) are still poorly understood. We here present a 12-Myr long SASM record by analyzing the strontium and neodymium isotopic composition of detrital components at IODP Exp. 359 Site U1467 from the northern Indian Ocean. The pro...

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Autores principales: Yao, Zhengquan, Shi, Xuefa, Guo, Zhengtang, Li, Xinzhou, Nath, B. Nagender, Betzler, Christian, Zhang, Hui, Lindhorst, Sebastian, Miriyala, Pavan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9929083/
https://www.ncbi.nlm.nih.gov/pubmed/36788217
http://dx.doi.org/10.1038/s41467-023-36537-6
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author Yao, Zhengquan
Shi, Xuefa
Guo, Zhengtang
Li, Xinzhou
Nath, B. Nagender
Betzler, Christian
Zhang, Hui
Lindhorst, Sebastian
Miriyala, Pavan
author_facet Yao, Zhengquan
Shi, Xuefa
Guo, Zhengtang
Li, Xinzhou
Nath, B. Nagender
Betzler, Christian
Zhang, Hui
Lindhorst, Sebastian
Miriyala, Pavan
author_sort Yao, Zhengquan
collection PubMed
description The evolution and driving mechanism of the South Asian summer monsoon (SASM) are still poorly understood. We here present a 12-Myr long SASM record by analyzing the strontium and neodymium isotopic composition of detrital components at IODP Exp. 359 Site U1467 from the northern Indian Ocean. The provenance investigation demonstrates that more dust enriched in εNd from northeastern Africa and the Arabian Peninsula was transported to the study site by monsoonal and Shamal winds during the summer monsoon season. A two-step weakening of the SASM wind since ~12 Ma is proposed based on the εNd record. This observational phenomenon is supported by climate modeling results, demonstrating that the SASM evolution was mainly controlled by variations in the gradient between the Mascarene High and the Indian Low, associated with meridional shifts of the Hadley Cell and the Intertropical Convergence Zone, which were caused by interhemispheric ice-sheet growth since the Middle Miocene.
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spelling pubmed-99290832023-02-16 Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma Yao, Zhengquan Shi, Xuefa Guo, Zhengtang Li, Xinzhou Nath, B. Nagender Betzler, Christian Zhang, Hui Lindhorst, Sebastian Miriyala, Pavan Nat Commun Article The evolution and driving mechanism of the South Asian summer monsoon (SASM) are still poorly understood. We here present a 12-Myr long SASM record by analyzing the strontium and neodymium isotopic composition of detrital components at IODP Exp. 359 Site U1467 from the northern Indian Ocean. The provenance investigation demonstrates that more dust enriched in εNd from northeastern Africa and the Arabian Peninsula was transported to the study site by monsoonal and Shamal winds during the summer monsoon season. A two-step weakening of the SASM wind since ~12 Ma is proposed based on the εNd record. This observational phenomenon is supported by climate modeling results, demonstrating that the SASM evolution was mainly controlled by variations in the gradient between the Mascarene High and the Indian Low, associated with meridional shifts of the Hadley Cell and the Intertropical Convergence Zone, which were caused by interhemispheric ice-sheet growth since the Middle Miocene. Nature Publishing Group UK 2023-02-14 /pmc/articles/PMC9929083/ /pubmed/36788217 http://dx.doi.org/10.1038/s41467-023-36537-6 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Yao, Zhengquan
Shi, Xuefa
Guo, Zhengtang
Li, Xinzhou
Nath, B. Nagender
Betzler, Christian
Zhang, Hui
Lindhorst, Sebastian
Miriyala, Pavan
Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title_full Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title_fullStr Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title_full_unstemmed Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title_short Weakening of the South Asian summer monsoon linked to interhemispheric ice-sheet growth since 12 Ma
title_sort weakening of the south asian summer monsoon linked to interhemispheric ice-sheet growth since 12 ma
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9929083/
https://www.ncbi.nlm.nih.gov/pubmed/36788217
http://dx.doi.org/10.1038/s41467-023-36537-6
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