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    Seasonality and buoyancy suppression of turbulence in the Bay of Bengal

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    Date
    2019-04-08
    Author
    Thakur, Ritabrata  Concept link
    Shroyer, Emily L.  Concept link
    Govindarajan, Rama  Concept link
    Farrar, J. Thomas  Concept link
    Weller, Robert A.  Concept link
    Moum, James N.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/24314
    As published
    https://doi.org/10.1029/2018GL081577
    DOI
    10.1029/2018GL081577
    Keyword
     Ocean turbulence; Turbulence suppression; Indian Monsoon; Bay of Bengal; Turbulent Mixing; Chipod 
    Abstract
    A yearlong record from moored current, temperature, conductivity, and four mixing meters (χpods) in the northernmost international waters of the Bay of Bengal quantifies upper‐ocean turbulent diffusivity of heat (Kt) and its response to the Indian monsoon. Data indicate (1) pronounced intermittency in turbulence at semidiurnal, diurnal, and near‐inertial timescales, (2) strong turbulence above 25‐m depth during the SW (summer) and NE (winter) monsoon relative to the transition periods (compare Kt > 10−4 m2/s to Kt  ∼ 10−5 m2/s, and (3) persistent suppression of turbulence (Kt < 10−5 m2/s) for 3 to 5 months in the latter half of the SW monsoon coincident with enhanced near‐surface stratification postarrival of low‐salinity water from the Brahmaputra‐Ganga‐Meghna delta and monsoonal precipitation. This suppression promotes maintenance of the low‐salinity surface waters within the interior of the bay preconditioning the upper northern Indian Ocean for the next year's monsoon.
    Description
    Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters, 46(8), (2019):4346-4355, doi:10.1029/2018GL081577.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Thakur, R., Shroyer, E. L., Govindarajan, R., Farrar, J. T., Weller, R. A., & Moum, J. N. (2019). Seasonality and buoyancy suppression of turbulence in the Bay of Bengal. Geophysical Research Letters, 46(8), 4346-4355.
     

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