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    Mechanisms of Barrier Layer Formation and Erosion from In Situ Observations in the Bay of Bengal

    Source: Journal of Physical Oceanography:;2019:;volume 049:;issue 005::page 1183
    Author:
    George, Jenson V.
    ,
    Vinayachandran, P. N.
    ,
    Vijith, V.
    ,
    Thushara, V.
    ,
    Nayak, Anoop A.
    ,
    Pargaonkar, Shrikant M.
    ,
    Amol, P.
    ,
    Vijaykumar, K.
    ,
    Matthews, Adrian J.
    DOI: 10.1175/JPO-D-18-0204.1
    Publisher: American Meteorological Society
    Abstract: AbstractDuring the Bay of Bengal (BoB) Boundary Layer Experiment (BoBBLE) in the southern BoB, time series of microstructure measurements were obtained at 8°N, 89°E from 4 to 14 July 2016. These observations captured events of barrier layer (BL) erosion and reformation. Initially, a three-layer structure was observed: a fresh surface mixed layer (ML) of thickness 10?20 m; a BL below of 30?40-m thickness with similar temperature but higher salinity; and a high salinity core layer, associated with the Summer Monsoon Current. Each of these three layers was in relative motion to the others, leading to regions of high shear at the interfaces. However, the destabilizing influence of the shear regions was not enough to overcome the haline stratification, and the three-layer structure was preserved. A salinity budget using in situ observations suggested that during the BL erosion, differential advection brought high salinity surface waters (34.5 psu) with weak stratification to the time series location and replaced the three-layer structure with a deep ML (~60 m). The resulting weakened stratification at the time series location then allowed atmospheric wind forcing to penetrate deeper. The turbulent kinetic energy dissipation rate and eddy diffusivity showed elevated values above 10?7 W kg?1 and 10?4 m2 s?1, respectively, in the upper 60 m. Later, the surface salinity decreased again (33.8 psu) through differential horizontal advection, stratification became stronger and elevated mixing rates were confined to the upper 20 m, and the BL reformed. A 1D model experiment suggested that in the study region, differential advection of temperature?salinity characteristics is essential for the maintenance of BL and to the extent to which mixing penetrates the water column.
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      Mechanisms of Barrier Layer Formation and Erosion from In Situ Observations in the Bay of Bengal

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263455
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    • Journal of Physical Oceanography

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    contributor authorGeorge, Jenson V.
    contributor authorVinayachandran, P. N.
    contributor authorVijith, V.
    contributor authorThushara, V.
    contributor authorNayak, Anoop A.
    contributor authorPargaonkar, Shrikant M.
    contributor authorAmol, P.
    contributor authorVijaykumar, K.
    contributor authorMatthews, Adrian J.
    date accessioned2019-10-05T06:48:00Z
    date available2019-10-05T06:48:00Z
    date copyright3/8/2019 12:00:00 AM
    date issued2019
    identifier otherJPO-D-18-0204.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263455
    description abstractAbstractDuring the Bay of Bengal (BoB) Boundary Layer Experiment (BoBBLE) in the southern BoB, time series of microstructure measurements were obtained at 8°N, 89°E from 4 to 14 July 2016. These observations captured events of barrier layer (BL) erosion and reformation. Initially, a three-layer structure was observed: a fresh surface mixed layer (ML) of thickness 10?20 m; a BL below of 30?40-m thickness with similar temperature but higher salinity; and a high salinity core layer, associated with the Summer Monsoon Current. Each of these three layers was in relative motion to the others, leading to regions of high shear at the interfaces. However, the destabilizing influence of the shear regions was not enough to overcome the haline stratification, and the three-layer structure was preserved. A salinity budget using in situ observations suggested that during the BL erosion, differential advection brought high salinity surface waters (34.5 psu) with weak stratification to the time series location and replaced the three-layer structure with a deep ML (~60 m). The resulting weakened stratification at the time series location then allowed atmospheric wind forcing to penetrate deeper. The turbulent kinetic energy dissipation rate and eddy diffusivity showed elevated values above 10?7 W kg?1 and 10?4 m2 s?1, respectively, in the upper 60 m. Later, the surface salinity decreased again (33.8 psu) through differential horizontal advection, stratification became stronger and elevated mixing rates were confined to the upper 20 m, and the BL reformed. A 1D model experiment suggested that in the study region, differential advection of temperature?salinity characteristics is essential for the maintenance of BL and to the extent to which mixing penetrates the water column.
    publisherAmerican Meteorological Society
    titleMechanisms of Barrier Layer Formation and Erosion from In Situ Observations in the Bay of Bengal
    typeJournal Paper
    journal volume49
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-18-0204.1
    journal fristpage1183
    journal lastpage1200
    treeJournal of Physical Oceanography:;2019:;volume 049:;issue 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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