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    An Annual Cycle of Submesoscale Vertical Flow and Restratification in the Upper Ocean

    Source: Journal of Physical Oceanography:;2019:;volume 049:;issue 006::page 1439
    Author:
    Yu, Xiaolong
    ,
    Naveira Garabato, Alberto C.
    ,
    Martin, Adrian P.
    ,
    Buckingham, Christian E.
    ,
    Brannigan, Liam
    ,
    Su, Zhan
    DOI: 10.1175/JPO-D-18-0253.1
    Publisher: American Meteorological Society
    Abstract: AbstractNumerical simulations suggest that submesoscale turbulence may transform lateral buoyancy gradients into vertical stratification and thus restratify the upper ocean via vertical flow. However, the observational evidence for this restratifying process has been lacking due to the difficulty in measuring such ephemeral phenomena, particularly over periods of months to years. This study presents an annual cycle of the vertical velocity and associated restratification estimated from two nested clusters of meso- and submesoscale-resolving moorings, deployed in a typical midocean area of the northeast Atlantic. Vertical velocities inferred using the nondiffusive density equation are substantially stronger at submesoscales (horizontal scales of 1?10 km) than at mesoscales (horizontal scales of 10?100 km), with respective root-mean-square values of 38.0 ± 6.9 and 22.5 ± 3.3 m day?1. The largest submesoscale vertical velocities and rates of restratification occur in events of a few days? duration in winter and spring, and extend down to at least 200 m below the mixed layer base. These events commonly coincide with the enhancement of submesoscale lateral buoyancy gradients, which is itself associated with persistent mesoscale frontogenesis. This suggests that mesoscale frontogenesis is a regular precursor of the submesoscale turbulence that restratifies the upper ocean. The upper-ocean restratification induced by submesoscale motions integrated over the annual cycle is comparable in magnitude to the net destratification driven by local atmospheric cooling, indicating that submesoscale flows play a significant role in determining the climatological upper-ocean stratification in the study area.
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      An Annual Cycle of Submesoscale Vertical Flow and Restratification in the Upper Ocean

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    contributor authorYu, Xiaolong
    contributor authorNaveira Garabato, Alberto C.
    contributor authorMartin, Adrian P.
    contributor authorBuckingham, Christian E.
    contributor authorBrannigan, Liam
    contributor authorSu, Zhan
    date accessioned2019-10-05T06:48:25Z
    date available2019-10-05T06:48:25Z
    date copyright4/8/2019 12:00:00 AM
    date issued2019
    identifier otherJPO-D-18-0253.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263475
    description abstractAbstractNumerical simulations suggest that submesoscale turbulence may transform lateral buoyancy gradients into vertical stratification and thus restratify the upper ocean via vertical flow. However, the observational evidence for this restratifying process has been lacking due to the difficulty in measuring such ephemeral phenomena, particularly over periods of months to years. This study presents an annual cycle of the vertical velocity and associated restratification estimated from two nested clusters of meso- and submesoscale-resolving moorings, deployed in a typical midocean area of the northeast Atlantic. Vertical velocities inferred using the nondiffusive density equation are substantially stronger at submesoscales (horizontal scales of 1?10 km) than at mesoscales (horizontal scales of 10?100 km), with respective root-mean-square values of 38.0 ± 6.9 and 22.5 ± 3.3 m day?1. The largest submesoscale vertical velocities and rates of restratification occur in events of a few days? duration in winter and spring, and extend down to at least 200 m below the mixed layer base. These events commonly coincide with the enhancement of submesoscale lateral buoyancy gradients, which is itself associated with persistent mesoscale frontogenesis. This suggests that mesoscale frontogenesis is a regular precursor of the submesoscale turbulence that restratifies the upper ocean. The upper-ocean restratification induced by submesoscale motions integrated over the annual cycle is comparable in magnitude to the net destratification driven by local atmospheric cooling, indicating that submesoscale flows play a significant role in determining the climatological upper-ocean stratification in the study area.
    publisherAmerican Meteorological Society
    titleAn Annual Cycle of Submesoscale Vertical Flow and Restratification in the Upper Ocean
    typeJournal Paper
    journal volume49
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-18-0253.1
    journal fristpage1439
    journal lastpage1461
    treeJournal of Physical Oceanography:;2019:;volume 049:;issue 006
    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
    yabeshDSpacePersian