Loop current cycle: Coupled response of the loop current with deep flows

Y. L. Chang, L. Y. Oey

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    25 引文 斯高帕斯(Scopus)

    摘要

    Although the upper-layer dynamics of the Loop Current and eddies in the Gulf of Mexico are well studied, the understanding of how they are coupled to the deep flows is limited. In this work, results from a numerical model are analyzed to classify the expansion, shedding, retraction, and deep-coupling cycle (the Loop Current cycle) according to the vertical mass flux across the base of the Loop. StageAis the "Loop reforming" period, with downward flux and deep divergence under the Loop Current. Stage B is the "incipient shedding," with strong upward flux and deep convergence. Stage C is the "eddy migration," with waning upward flux and deep throughflow from the western Gulf into the Yucatan Channel. Because of the strong deep coupling between the eastern and western Gulf, the Loop's expansion is poorly correlated with deep flows through the Yucatan Channel. Stage A is longest and the mean vertical flux under the Loop Current is downward. Therefore, because the net circulation around the abyssal basin is zero, the abyssal gyre in the western Gulf is cyclonic. The gyre's strength is strongest when the Loop Current is reforming and weakest after an eddy is shed. The result suggests that the Loop Current cycle can force a low-frequency [time scales ~ shedding periods; O(months)] abyssal oscillation in the Gulf of Mexico.

    原文英語
    頁(從 - 到)458-471
    頁數14
    期刊Journal of Physical Oceanography
    41
    發行號3
    DOIs
    出版狀態已發佈 - 2011 三月

    ASJC Scopus subject areas

    • Oceanography

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