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    Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial

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    Denniston et al (2017) for WHOI.pdf (1.808Mb)
    Date
    2017-09
    Author
    Denniston, Rhawn F.  Concept link
    Asmerom, Yemane  Concept link
    Polyak, Victor J.  Concept link
    Wanamaker, Alan D.  Concept link
    Ummenhofer, Caroline C.  Concept link
    Humphreys, William F.  Concept link
    Cugley, John  Concept link
    Woods, David  Concept link
    Lucker, Stephanie  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9424
    As published
    https://doi.org/10.1016/j.quascirev.2017.09.014
    Keyword
     Stalagmite; Carbon isotope; Oxygen isotope; Indo-Australian summer monsoon 
    Abstract
    Recent studies of stalagmites from the Southern Hemisphere tropics of Indonesia revealed two shifts in monsoon activity not apparent in records from the Northern Hemisphere sectors of the Austral-Asian monsoon system: an interval of enhanced rainfall at ~19 ka, immediately prior to Heinrich Stadial 1, and a sharp increase in precipitation at ~9 ka. Determining whether these events are site-specific or regional is important for understanding the full range of sensitivities of the Austral-Asian monsoon. We present a discontinuous 40 kyr carbon isotope record of stalagmites from two caves in the Kimberley region of the north-central Australian tropics. Heinrich stadials are represented by pronounced negative carbon isotopic anomalies, indicative of enhanced rainfall associated with a southward shift of the intertropical convergence zone and consistent with hydroclimatic changes observed across Asia and the Indo- Pacific. Between 20-8 ka, however, the Kimberley stalagmites, like the Indonesian record, reveal decoupling of monsoon behavior from Southeast Asia, including the early deglacial wet period (which we term the Late Glacial Pluvial) and the abrupt strengthening of early Holocene monsoon rainfall.
    Description
    © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Quaternary Science Reviews 176 (2017): 101-105, doi:10.1016/j.quascirev.2017.09.014.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Preprint: Denniston, Rhawn F., Asmerom, Yemane, Polyak, Victor J., Wanamaker, Alan D., Ummenhofer, Caroline C., Humphreys, William F., Cugley, John, Woods, David, Lucker, Stephanie, "Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial", 2017-09, https://doi.org/10.1016/j.quascirev.2017.09.014, https://hdl.handle.net/1912/9424
     

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