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      The abrupt onset of the modern South Asian Monsoon winds

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          Abstract

          The South Asian Monson (SAM) is one of the most intense climatic elements yet its initiation and variations are not well established. Dating the deposits of SAM wind-driven currents in IODP cores from the Maldives yields an age of 12. 9 Ma indicating an abrupt SAM onset, over a short period of 300 kyrs. This coincided with the Indian Ocean Oxygen Minimum Zone expansion as revealed by geochemical tracers and the onset of upwelling reflected by the sediment’s content of particulate organic matter. A weaker ‘proto-monsoon’ existed between 12.9 and 25 Ma, as mirrored by the sedimentary signature of dust influx. Abrupt SAM initiation favors a strong influence of climate in addition to the tectonic control, and we propose that the post Miocene Climate Optimum cooling, together with increased continentalization and establishment of the bipolar ocean circulation, i.e. the beginning of the modern world, shifted the monsoon over a threshold towards the modern system.

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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 Phanerozoic record of global sea-level change.

            K. Miller (2005)
            We review Phanerozoic sea-level changes [543 million years ago (Ma) to the present] on various time scales and present a new sea-level record for the past 100 million years (My). Long-term sea level peaked at 100 +/- 50 meters during the Cretaceous, implying that ocean-crust production rates were much lower than previously inferred. Sea level mirrors oxygen isotope variations, reflecting ice-volume change on the 10(4)- to 10(6)-year scale, but a link between oxygen isotope and sea level on the 10(7)-year scale must be due to temperature changes that we attribute to tectonically controlled carbon dioxide variations. Sea-level change has influenced phytoplankton evolution, ocean chemistry, and the loci of carbonate, organic carbon, and siliciclastic sediment burial. Over the past 100 My, sea-level changes reflect global climate evolution from a time of ephemeral Antarctic ice sheets (100 to 33 Ma), through a time of large ice sheets primarily in Antarctica (33 to 2.5 Ma), to a world with large Antarctic and large, variable Northern Hemisphere ice sheets (2.5 Ma to the present).
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              Onset of Asian desertification by 22 Myr ago inferred from loess deposits in China.

              The initial desertification in the Asian interior is thought to be one of the most prominent climate changes in the Northern Hemisphere during the Cenozoic era. But the dating of this transition is uncertain, partly because desert sediments are usually scattered, discontinuous and difficult to date. Here we report nearly continuous aeolian deposits covering the interval from 22 to 6.2 million years ago, on the basis of palaeomagnetic measurements and fossil evidence. A total of 231 visually definable aeolian layers occur as brownish loesses interbedded with reddish soils. This new evidence indicates that large source areas of aeolian dust and energetic winter monsoon winds to transport the material must have existed in the interior of Asia by the early Miocene epoch, at least 14 million years earlier than previously thought. Regional tectonic changes and ongoing global cooling are probable causes of these changes in aridity and circulation in Asia.
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                Author and article information

                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group
                2045-2322
                20 July 2016
                2016
                : 6
                : 29838
                Affiliations
                [1 ]Institute of Geology, CEN, University of Hamburg , Bundesstrasse 55, Hamburg 20146, Germany
                [2 ]Department of Marine Geosciences, Rosenstiel School of Marine & Atmospheric Science, University of Miami , Miami FL 33149, USA
                [3 ]Department of Geology and Geophysics, University of Edinburgh, Grant Institute, The King’s Buildings , West Mains Road, Edinburgh EH9 3JW, United Kingdom
                [4 ]Department of Geological Sciences, Rutgers, The State University of New Jersey , 610 Taylor Road, Piscataway NJ 08854-8066, USA
                [5 ]Geological Oceanography Division, CSIR-National Institute of Oceanography , Dona Paula Goa 403004, India
                [6 ]International Ocean Discovery Program, Texas A&M University , Discovery Drive, College Station TX 77845, USA
                [7 ]Instituto Portugues do Mar e da Atmosfera (IPMA), Divisão de Geologia e Georecursos Marinhos , Avenida de Brasilia 6, 1449-006 Lisboa, Portugal
                [8 ]Centro de Ciencias do Mar (CCMAR), Universidade do Algarve , Faro, Portugal
                [9 ]Dr. Moses Strauss Department of Marine Geosciences, The Leon H. Charney School of Marine Sciences, University of Haifa , Carmel 31905, Israel
                [10 ]Department of Geosciences, Princeton University , Guyot Hall, Princeton NJ 08544, USA
                [11 ]Department of Geological Sciences, California State University Bakersfield , 9001 Stockdale Highway, Bakersfield, CA 93311, USA
                [12 ]Physical Properties Specialist, Ecole Nationale Superieure de Geologie, Universite de Lorraine, 2 rue du Doyen Marcel Roubault , Vandoeuvre-les-Nancy 54501, France
                [13 ]Petroleum and Marine Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM) , Gwahang-no 124, Yuseong-gu, Daejeon 305-350, Korea
                [14 ]Graduate School of Natural Science and Technology, Okayama University , 3-1-1 Tsushima-naka 700-8530, Japan
                [15 ]Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo , SP 05508-120, Brazil
                [16 ]Istituto di Scienze della Terra, Università di Urbino , Via S. Chiara 27, Urbino 61029, Italy
                [17 ]Department of Geology and Geophysics, Texas A&M University , Mail Stop 3115, College Station TX 77843-3115, USA
                [18 ]Department of Environmental Engineering for Symbiosis, Soka University , 1-236 Tangi-cyo, Hachioji-shi Tokyo 192-0003, Japan
                [19 ]Graduate School of Science and Engineering, Yamagata University , 1-4-12 Kojirakawa-machi, Yamagata City 990-8560, Japan
                [20 ]Environmental Science and Policy Department, David King Hall Rm 3005, MSN 5F2, George Mason University, University Drive , Fairfax, VA 22030-4444, USA
                [21 ]Department of Geosciences, Geotechnology and Materials Engineering for Resources, Akita University , 1-1 Teagata-Gakuencho, Akita 010-8502 Japan
                [22 ]Department of Earth and Life Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1085, HV Amsterdam, The Netherlands
                [23 ]Lamont-Doherty Earth Observatory, Columbia University, Borehole Bldg. 61 Route 9W , Palisades NY 10964, USA
                [24 ]Earth and Environmental Sciences, University of Technology Queensland , R-Block 317, 2 George Street, Brisbane Queensland 4001, Australia
                [25 ]Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences , West Xingang Road, Guangzhou 510301, P.R. China
                [26 ]Department of Marine Geology, First Institute of Oceanography (FIO) State Oceanic Administration (SOA) , #6 Xian Xia Ling Road, Qingdao Shandong Province 266061, P.R. China
                [27 ]Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology , Qingdao, P.R. China
                [28 ]Department of Earth Sciences, University College London , Gower Street, London WC1E 6BT, United Kingdom
                Author notes
                Article
                srep29838
                10.1038/srep29838
                4951686
                27436574
                126e1ae3-9990-4513-932c-7c28cb9034c7
                Copyright © 2016, Macmillan Publishers Limited

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 25 April 2016
                : 21 June 2016
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