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    Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico

    Source: Journal of Physical Oceanography:;2019:;volume 049:;issue 003::page 675
    Author:
    Pearson, Jenna
    ,
    Fox-Kemper, Baylor
    ,
    Barkan, Roy
    ,
    Choi, Jun
    ,
    Bracco, Annalisa
    ,
    McWilliams, James C.
    DOI: 10.1175/JPO-D-18-0029.1
    Publisher: American Meteorological Society
    Abstract: There are limitations in approximating Eulerian statistics from surface drifters, due to biases from surface convergences. By contrasting second- and third-order Eulerian and surface drifter structure functions obtained from a model of the Gulf of Mexico, the consequences of the semi-Lagrangian nature of observations during the summer Grand Lagrangian Deployment (GLAD) and winter Lagrangian Submesoscale Experiment (LASER) are estimated. By varying launch pattern and location, the robustness and sensitivity of these statistics are evaluated. Over scales less than 10 km, second-order structure functions of surface drifters consistently have shallower slopes (~r2/3) than Eulerian statistics (~r), suggesting that surface drifter structure functions differ systematically and do not reproduce the scalings of the Eulerian fields. Medians of Eulerian and cluster release second-order statistics are also significantly different across all scales. Synthetic cluster release statistics depend on launch location and weakly on launch pattern. The observations suggest little seasonal difference in the second-order statistics, but the LASER third-order structure function shows a sign change around 1 km, while GLAD and the synthetic cluster releases show a third-order structure function sign change around 10 km. Further, synthetic surface drifter cluster releases (and therefore likely the GLAD observations) show robust biases in the negative third-order structure functions, which may lead to significant overestimation of the spectral energy flux and underestimation of the transition scale to a forward energy cascade. The Helmholtz decomposition, and curl and divergence statistics, of Eulerian and cluster releases differ, particularly on scales less than 10 km, in agreement with observations of drifters preferentially sampling convergences in coherent structures.
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      Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico

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    contributor authorPearson, Jenna
    contributor authorFox-Kemper, Baylor
    contributor authorBarkan, Roy
    contributor authorChoi, Jun
    contributor authorBracco, Annalisa
    contributor authorMcWilliams, James C.
    date accessioned2019-09-22T09:03:14Z
    date available2019-09-22T09:03:14Z
    date copyright1/9/2019 12:00:00 AM
    date issued2019
    identifier otherJPO-D-18-0029.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262546
    description abstractThere are limitations in approximating Eulerian statistics from surface drifters, due to biases from surface convergences. By contrasting second- and third-order Eulerian and surface drifter structure functions obtained from a model of the Gulf of Mexico, the consequences of the semi-Lagrangian nature of observations during the summer Grand Lagrangian Deployment (GLAD) and winter Lagrangian Submesoscale Experiment (LASER) are estimated. By varying launch pattern and location, the robustness and sensitivity of these statistics are evaluated. Over scales less than 10 km, second-order structure functions of surface drifters consistently have shallower slopes (~r2/3) than Eulerian statistics (~r), suggesting that surface drifter structure functions differ systematically and do not reproduce the scalings of the Eulerian fields. Medians of Eulerian and cluster release second-order statistics are also significantly different across all scales. Synthetic cluster release statistics depend on launch location and weakly on launch pattern. The observations suggest little seasonal difference in the second-order statistics, but the LASER third-order structure function shows a sign change around 1 km, while GLAD and the synthetic cluster releases show a third-order structure function sign change around 10 km. Further, synthetic surface drifter cluster releases (and therefore likely the GLAD observations) show robust biases in the negative third-order structure functions, which may lead to significant overestimation of the spectral energy flux and underestimation of the transition scale to a forward energy cascade. The Helmholtz decomposition, and curl and divergence statistics, of Eulerian and cluster releases differ, particularly on scales less than 10 km, in agreement with observations of drifters preferentially sampling convergences in coherent structures.
    publisherAmerican Meteorological Society
    titleImpacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico
    typeJournal Paper
    journal volume49
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-18-0029.1
    journal fristpage675
    journal lastpage690
    treeJournal of Physical Oceanography:;2019:;volume 049:;issue 003
    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