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    Evidence of silicic acid leakage to the tropical Atlantic via Antarctic Intermediate Water during Marine Isotope Stage 4

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    Date
    2013-06-27
    Author
    Griffiths, James D.  Concept link
    Barker, Stephen  Concept link
    Hendry, Katharine R.  Concept link
    Thornalley, David J. R.  Concept link
    van de Flierdt, Tina  Concept link
    Hall, Ian R.  Concept link
    Anderson, Robert F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6165
    As published
    https://doi.org/10.1002/palo.20030
    DOI
    10.1002/palo.20030
    Keyword
     Silica leakage; Diatom; Carbon dioxide; SAMW; AAIW 
    Abstract
    Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced supply of silicic acid by AAIW (and SAMW) during glacial periods may have enabled tropical diatoms to outcompete carbonate-producing phytoplankton, decreasing the relative export of inorganic to organic carbon to the deep ocean and lowering atmospheric pCO2. This mechanism is known as the “silicic acid leakage hypothesis” (SALH). Here we present records of neodymium and silicon isotopes from the western tropical Atlantic that provide the first direct evidence of increased silicic acid leakage from the Southern Ocean to the tropical Atlantic within AAIW during glacial Marine Isotope Stage 4 (~60–70 ka). This leakage was approximately coeval with enhanced diatom export in the NW Atlantic and across the eastern equatorial Atlantic and provides support for the SALH as a contributor to CO2 drawdown during full glacial development.
    Description
    Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 28 (2013): 307–318, doi:10.1002/palo.20030.
    Collections
    • Geology and Geophysics (G&G)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Paleoceanography 28 (2013): 307–318
     
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