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    Submesoscale processes at shallow salinity fronts in the Bay of Bengal : observations during the winter monsoon

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    Date
    2018-02-26
    Author
    Ramachandran, Sanjiv  Concept link
    Tandon, Amit  Concept link
    MacKinnon, Jennifer A.  Concept link
    Lucas, Andrew J.  Concept link
    Pinkel, Robert  Concept link
    Waterhouse, Amy F.  Concept link
    Nash, Jonathan D.  Concept link
    Shroyer, Emily L.  Concept link
    Mahadevan, Amala  Concept link
    Weller, Robert A.  Concept link
    Farrar, J. Thomas  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10362
    As published
    https://doi.org/10.1175/JPO-D-16-0283.1
    DOI
    10.1175/JPO-D-16-0283.1
    Keyword
     Indian Ocean; Baroclinic flows; Potential vorticity; Fronts; Monsoons; Oceanic mixed layer 
    Abstract
    Lateral submesoscale processes and their influence on vertical stratification at shallow salinity fronts in the central Bay of Bengal during the winter monsoon are explored using high-resolution data from a cruise in November 2013. The observations are from a radiator survey centered at a salinity-controlled density front, embedded in a zone of moderate mesoscale strain (0.15 times the Coriolis parameter) and forced by winds with a downfront orientation. Below a thin mixed layer, often ≤10 m, the analysis shows several dynamical signatures indicative of submesoscale processes: (i) negative Ertel potential vorticity (PV); (ii) low-PV anomalies with O(1–10) km lateral extent, where the vorticity estimated on isopycnals and the isopycnal thickness are tightly coupled, varying in lockstep to yield low PV; (iii) flow conditions susceptible to forced symmetric instability (FSI) or bearing the imprint of earlier FSI events; (iv) negative lateral gradients in the absolute momentum field (inertial instability); and (v) strong contribution from differential sheared advection at O(1) km scales to the growth rate of the depth-averaged stratification. The findings here show one-dimensional vertical processes alone cannot explain the vertical stratification and its lateral variability over O(1–10) km scales at the radiator survey.
    Description
    Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 48 (2018): 479-509, doi:10.1175/JPO-D-16-0283.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Physical Oceanography 48 (2018): 479-509
     

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