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    Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean

    Source: Journal of Physical Oceanography:;2018:;volume 049:;issue 001::page 85
    Author:
    Chen, Gengxin
    ,
    Han, Weiqing
    ,
    Li, Yuanlong
    ,
    Yao, Jinglong
    ,
    Wang, Dongxiao
    DOI: 10.1175/JPO-D-18-0151.1
    Publisher: American Meteorological Society
    Abstract: By analyzing in situ observations and conducting a series of ocean general circulation model experiments, this study investigates the physical processes controlling intraseasonal variability (ISV) of the Equatorial Undercurrent (EUC) of the Indian Ocean. ISV of the EUC leads to time-varying water exchanges between the western and eastern equatorial Indian Ocean. For the 2001?14 period, standard deviations of the EUC transport variability are 1.92 and 1.77 Sv (1 Sv ≡ 106 m3 s?1) in the eastern and western basins, respectively. The ISV of the EUC is predominantly caused by the wind forcing effect of atmospheric intraseasonal oscillations (ISOs) but through dramatically different ocean dynamical processes in the eastern and western basins. The stronger ISV in the eastern basin is dominated by the reflected Rossby waves associated with intraseasonal equatorial zonal wind forcing. It takes 20?30 days to set up an intraseasonal EUC anomaly through the Kelvin and Rossby waves associated with the first and second baroclinic modes. In the western basin, the peak intraseasonal EUC anomaly is generated by the zonal pressure gradient force, which is set up by radiating equatorial Kelvin and Rossby waves induced by the equatorial wind stress. Directly forced and reflected Rossby waves from the eastern basin propagate westward, contributing to intraseasonal zonal current near the surface but having weak impact on the peak ISV of the EUC.
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      Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean

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    contributor authorChen, Gengxin
    contributor authorHan, Weiqing
    contributor authorLi, Yuanlong
    contributor authorYao, Jinglong
    contributor authorWang, Dongxiao
    date accessioned2019-09-22T09:03:15Z
    date available2019-09-22T09:03:15Z
    date copyright10/23/2018 12:00:00 AM
    date issued2018
    identifier otherJPO-D-18-0151.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262550
    description abstractBy analyzing in situ observations and conducting a series of ocean general circulation model experiments, this study investigates the physical processes controlling intraseasonal variability (ISV) of the Equatorial Undercurrent (EUC) of the Indian Ocean. ISV of the EUC leads to time-varying water exchanges between the western and eastern equatorial Indian Ocean. For the 2001?14 period, standard deviations of the EUC transport variability are 1.92 and 1.77 Sv (1 Sv ≡ 106 m3 s?1) in the eastern and western basins, respectively. The ISV of the EUC is predominantly caused by the wind forcing effect of atmospheric intraseasonal oscillations (ISOs) but through dramatically different ocean dynamical processes in the eastern and western basins. The stronger ISV in the eastern basin is dominated by the reflected Rossby waves associated with intraseasonal equatorial zonal wind forcing. It takes 20?30 days to set up an intraseasonal EUC anomaly through the Kelvin and Rossby waves associated with the first and second baroclinic modes. In the western basin, the peak intraseasonal EUC anomaly is generated by the zonal pressure gradient force, which is set up by radiating equatorial Kelvin and Rossby waves induced by the equatorial wind stress. Directly forced and reflected Rossby waves from the eastern basin propagate westward, contributing to intraseasonal zonal current near the surface but having weak impact on the peak ISV of the EUC.
    publisherAmerican Meteorological Society
    titleIntraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean
    typeJournal Paper
    journal volume49
    journal issue1
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-18-0151.1
    journal fristpage85
    journal lastpage101
    treeJournal of Physical Oceanography:;2018:;volume 049:;issue 001
    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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