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    Indian monsoon variations during three contrasting climatic periods : the Holocene, Heinrich Stadial 2 and the last interglacial-glacial transition

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    WHOAS-Zorzi et al., 2015.pdf (640.1Kb)
    Supplementary data (942.5Kb)
    Date
    2015-06
    Author
    Zorzi, Coralie  Concept link
    Sanchez Goni, Maria Fernanda  Concept link
    Anupama, Krishnamurthy  Concept link
    Prasad, Srinivasan  Concept link
    Hanquiez, Vincent  Concept link
    Johnson, Joel E.  Concept link
    Giosan, Liviu  Concept link
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    Citable URI
    https://hdl.handle.net/1912/7606
    As published
    https://doi.org/10.1016/j.quascirev.2015.06.009
    Keyword
     Indian summer monsoon; Core Monsoon Zone; Pollen assemblage; Holocene; Heinrich Stadial 2; Last interglacial-glacial transition 
    Abstract
    In contrast to the East Asian and African monsoons the Indian monsoon is still poorly documented throughout the last climatic cycle (last 135,000 years). Pollen analysis from two marine sediment cores (NGHP-01-16A and NGHP-01-19B) collected from the offshore Godavari and Mahanadi basins, both located in the Core Monsoon Zone (CMZ) reveals changes in Indian summer monsoon variability and intensity during three contrasting climatic periods: the Holocene, the Heinrich Stadial (HS) 2 and the Marine Isotopic Stage (MIS) 5/4 during the ice sheet growth transition. During the first part of the Holocene between 11,300 and 4,200 cal years BP, characterized by high insolation (minimum precession, maximum obliquity), the maximum extension of the coastal forest and mangrove reflects high monsoon rainfall. This climatic regime contrasts with that of the second phase of the Holocene, from 4,200 cal years BP to the present, marked by the development of drier vegetation in a context of low insolation (maximum precession, minimum obliquity). The historical period in India is characterized by an alternation of strong and weak monsoon centennial phases that may reflect the Medieval Climate Anomaly and the Little Ice Age, respectively. During the HS 2, a period of low insolation and extensive iceberg discharge in the North Atlantic Ocean, vegetation was dominated by grassland and dry flora indicating pronounced aridity as the result of a weak Indian summer monsoon. The MIS 5/4 glaciation, also associated with low insolation but moderate freshwater fluxes, was characterized by a weaker reduction of the Indian summer monsoon and a decrease of seasonal contrast as recorded by the expansion of dry vegetation and the development of Artemisia, respectively. Our results support model predictions suggesting that insolation changes control the long term trend of the Indian monsoon precipitation, but its millennial scale variability and intensity are instead modulated by atmospheric teleconnections to remote phenomena in the North Atlantic, Eurasia or the Indian Ocean.
    Description
    Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Quaternary Science Reviews 125 (2015): 50-60, doi:10.1016/j.quascirev.2015.06.009.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Zorzi, Coralie, Sanchez Goni, Maria Fernanda, Anupama, Krishnamurthy, Prasad, Srinivasan, Hanquiez, Vincent, Johnson, Joel E., Giosan, Liviu, "Indian monsoon variations during three contrasting climatic periods : the Holocene, Heinrich Stadial 2 and the last interglacial-glacial transition", 2015-06, https://doi.org/10.1016/j.quascirev.2015.06.009, https://hdl.handle.net/1912/7606
     

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