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    Transport by Lagrangian Vortices in the Eastern Pacific

    Source: Journal of Physical Oceanography:;2018:;volume 048:;issue 003::page 667
    Author:
    Abernathey, Ryan
    ,
    Haller, George
    DOI: 10.1175/JPO-D-17-0102.1
    Publisher: American Meteorological Society
    Abstract: AbstractRotationally coherent Lagrangian vortices (RCLVs) are identified from satellite-derived surface geostrophic velocities in the eastern Pacific (180°?130°W) using the objective (frame invariant) finite-time Lagrangian coherent structure detection method of Haller et al. based on the Lagrangian-averaged vorticity deviation. RCLVs are identified for 30-, 90-, and 270-day intervals over the entire satellite dataset, beginning in 1993. In contrast to structures identified using Eulerian eddy-tracking methods, the RCLVs maintain material coherence over the specified time intervals, making them suitable for material transport estimates. Statistics of RCLVs are compared to statistics of eddies identified from sea surface height (SSH) by Chelton et al. RCLVs and SSH eddies are found to propagate westward at similar speeds at each latitude, consistent with the Rossby wave dispersion relation. However, RCLVs are uniformly smaller and shorter-lived than SSH eddies. A coherent eddy diffusivity is derived to quantify the contribution of RCLVs to meridional transport; it is found that RCLVs contribute less than 1% to net meridional dispersion and diffusion in this sector, implying that eddy transport of tracers is mostly due to incoherent motions, such as swirling and filamentation outside of the eddy cores, rather than coherent meridional translation of eddies themselves. These findings call into question prior estimates of coherent eddy transport based on Eulerian eddy identification methods.
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      Transport by Lagrangian Vortices in the Eastern Pacific

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    contributor authorAbernathey, Ryan
    contributor authorHaller, George
    date accessioned2019-09-19T10:02:24Z
    date available2019-09-19T10:02:24Z
    date copyright1/31/2018 12:00:00 AM
    date issued2018
    identifier otherjpo-d-17-0102.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4260863
    description abstractAbstractRotationally coherent Lagrangian vortices (RCLVs) are identified from satellite-derived surface geostrophic velocities in the eastern Pacific (180°?130°W) using the objective (frame invariant) finite-time Lagrangian coherent structure detection method of Haller et al. based on the Lagrangian-averaged vorticity deviation. RCLVs are identified for 30-, 90-, and 270-day intervals over the entire satellite dataset, beginning in 1993. In contrast to structures identified using Eulerian eddy-tracking methods, the RCLVs maintain material coherence over the specified time intervals, making them suitable for material transport estimates. Statistics of RCLVs are compared to statistics of eddies identified from sea surface height (SSH) by Chelton et al. RCLVs and SSH eddies are found to propagate westward at similar speeds at each latitude, consistent with the Rossby wave dispersion relation. However, RCLVs are uniformly smaller and shorter-lived than SSH eddies. A coherent eddy diffusivity is derived to quantify the contribution of RCLVs to meridional transport; it is found that RCLVs contribute less than 1% to net meridional dispersion and diffusion in this sector, implying that eddy transport of tracers is mostly due to incoherent motions, such as swirling and filamentation outside of the eddy cores, rather than coherent meridional translation of eddies themselves. These findings call into question prior estimates of coherent eddy transport based on Eulerian eddy identification methods.
    publisherAmerican Meteorological Society
    titleTransport by Lagrangian Vortices in the Eastern Pacific
    typeJournal Paper
    journal volume48
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-17-0102.1
    journal fristpage667
    journal lastpage685
    treeJournal of Physical Oceanography:;2018:;volume 048:;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