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

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          Abstract

          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.

          Abstract

          The εNd record from the IODP Exp. 359 Site U1467 in the northern Indian Ocean, along with climate modeling, reveals a two-step weakening of the South Asian summer monsoon (SASM) wind since 12 Ma. The SASM evolution was mainly caused by interhemispheric ice-sheet growth since the Middle Miocene.

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          Trends, rhythms, and aberrations in global climate 65 Ma to present.

          Since 65 million years ago (Ma), Earth's climate has undergone a significant and complex evolution, the finer details of which are now coming to light through investigations of deep-sea sediment cores. This evolution includes gradual trends of warming and cooling driven by tectonic processes on time scales of 10(5) to 10(7) years, rhythmic or periodic cycles driven by orbital processes with 10(4)- to 10(6)-year cyclicity, and rare rapid aberrant shifts and extreme climate transients with durations of 10(3) to 10(5) years. Here, recent progress in defining the evolution of global climate over the Cenozoic Era is reviewed. We focus primarily on the periodic and anomalous components of variability over the early portion of this era, as constrained by the latest generation of deep-sea isotope records. We also consider how this improved perspective has led to the recognition of previously unforeseen mechanisms for altering climate.
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            The Community Earth System Model: A Framework for Collaborative Research

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              Long-Term Variations of Daily Insolation and Quaternary Climatic Changes

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                Author and article information

                Contributors
                yaozq@fio.org.cn
                xfshi@fio.org.cn
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                14 February 2023
                14 February 2023
                2023
                : 14
                : 829
                Affiliations
                [1 ]GRID grid.453137.7, ISNI 0000 0004 0406 0561, Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, , Ministry of Natural Resources, ; Qingdao, China
                [2 ]GRID grid.484590.4, ISNI 0000 0004 5998 3072, Laboratory for Marine Geology, , Qingdao National Laboratory for Marine Science and Technology, ; Qingdao, China
                [3 ]GRID grid.9227.e, ISNI 0000000119573309, Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, , Chinese Academy of Sciences, ; Beijing, China
                [4 ]GRID grid.9227.e, ISNI 0000000119573309, CAS Center for Excellence in Life and Paleoenvironment, ; Beijing, China
                [5 ]GRID grid.410726.6, ISNI 0000 0004 1797 8419, University of Chinese Academy of Sciences, ; Beijing, China
                [6 ]GRID grid.9227.e, ISNI 0000000119573309, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, , Chinese Academy of Sciences, ; Xi’an, China
                [7 ]GRID grid.458457.f, ISNI 0000 0004 1792 8067, CAS Center for Excellence in Quaternary Science and Global Change, ; Xi’an, China
                [8 ]GRID grid.436330.1, ISNI 0000 0000 9040 9555, Geological Oceanography Division, , CSIR-National Institute of Oceanography, ; Dona Paula, Goa India
                [9 ]GRID grid.9026.d, ISNI 0000 0001 2287 2617, Institute of Geology, CEN, , University of Hamburg, ; Hamburg, Germany
                [10 ]GRID grid.419382.5, ISNI 0000 0004 0496 9708, CSIR-National Geophysical Research Institute, ; Hyderabad, India
                Author information
                http://orcid.org/0000-0002-9185-2385
                http://orcid.org/0000-0001-8204-8021
                http://orcid.org/0000-0001-8438-3552
                http://orcid.org/0000-0002-5757-4553
                Article
                36537
                10.1038/s41467-023-36537-6
                9929083
                36788217
                cab67b8c-8961-41b5-8f1c-2869126c07e4
                © The Author(s) 2023

                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/.

                History
                : 21 March 2022
                : 6 February 2023
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                © The Author(s) 2023

                Uncategorized
                palaeoclimate,palaeoceanography
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                palaeoclimate, palaeoceanography

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