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Eddy Cancellation of the Ekman Cell in Subtropical Gyres

机译:亚热带回旋中埃克曼细胞的涡旋消除

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摘要

The presence of large-scale Ekman pumping associated with the climatological wind stress curl is the textbook explanation for low biological activity in the subtropical gyres. Using an idealized, eddy-resolving model, it is shown that Eulerian-mean Ekman pumping may be opposed by an eddy-driven circulation, analogous to the way in which the atmospheric Ferrel cell and the Southern Ocean Deacon cell are opposed by eddy-driven circulations. Lagrangian particle tracking, potential vorticity fluxes, and depth-density streamfunctions are used to show that, in the model, the rectified effect of eddies acts to largely cancel the Eulerian-mean Ekman downwelling. To distinguish this effect from eddy compensation, it is proposed that the suppression of Eulerian-mean downwelling by eddies be called "eddy cancellation."
机译:与气候风应力卷曲相关的大规模埃克曼抽水的存在是对亚热带回旋中低生物活性的教科书解释。使用理想化的涡旋解析模型,表明欧拉平均Ekman抽水可能受到涡流驱动的循环的阻碍,类似于大气Ferrel细胞和南大洋迪肯细胞受到涡流驱动的方式的对抗流通。拉格朗日粒子跟踪,潜在的涡度通量和深度密度流函数用于表明,在该模型中,涡流的校正作用可在很大程度上抵消欧拉平均Ekman下降趋势。为了将这种效果与涡流补偿区分开,建议将涡流对欧拉均值下降的抑制作用称为“涡流抵消”。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第10期|2995-3010|共16页
  • 作者单位

    Univ Oxford, Dept Phys, Oxford, England;

    Univ Oxford, Dept Phys, Oxford, England;

    Australian Natl Univ, Res Sch Earth Sci, Acton, ACT, Australia|Australian Natl Univ, ARC Ctr Excellence Climate Syst Sci, Acton, ACT, Australia;

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