Seasonality and buoyancy suppression of turbulence in the Bay of Bengal
Shroyer, Emily L.
Farrar, J. Thomas
Weller, Robert A.
Moum, James N.
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Keywordocean turbulence; turbulence suppression; Indian Monsoon; Bay of Bengal; Turbulent Mixing; Chipod
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.
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.
Suggested CitationThakur, 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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