Structure of the subsurface counter current beneath the Tsushima warm current simulated by an ocean general circulation model

You Ichiro Sasajima, Satoshi Nakada, Naoki Hirose, Jong Hwan Yoon

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    The subsurface counter current beneath the Tsushima Warm Current is simulated using a three-dimensional circulation model. The model well reproduces the counter current beneath the Tsushima Warm Current on the shelf break. The counter current appears as nearshore parts of the subsurface clockwise circulations from spring to early winter. The clockwise circulations are separated by developed shelves such as the Oki Spur and the Noto Peninsula, thus the counter current is not a continuous flow along the Japanese coast in this model. The vertical structure of the counter current can be explained by a density structure with the thermal wind relationship. The permanent and seasonal pycnoclines form mutually opposite horizontal density gradients near the Japanese coast in summer. Such a density structure results in a speed maximum of the counter current away from the bottom. It is remarkable that the second baroclinic mode is dominant in nearshore parts of the subsurface clockwise circulations in summer, which are attributed to the density structure. Similar density structures are also found in some coastal regions of the world oceans where subsurface counter currents are expected.

    Original languageEnglish
    Pages (from-to)913-926
    Number of pages14
    JournalJournal of Oceanography
    Volume63
    Issue number6
    DOIs
    Publication statusPublished - Dec 2007

    All Science Journal Classification (ASJC) codes

    • Oceanography

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