The contribution of standing Rossby waves to the development of the Tsushima Warm Current-meandering

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  • 対馬暖流の蛇行発達に対する定在ロスビー波の寄与
  • ツシマ ダンリュウ ノ ダコウ ハッタツ ニ タイスル テイザイロスビーハ ノ キヨ

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<p>The quasi-stationary flow pattern in the Tsushima Warm Current (TWC) is the meandering flow. A simple linear reduced-gravity channel model on the planetary β-plane driven by a change of eastward flow under assumption of the TWC is used to examine the physical mechanism for the interannual development and decay of the meandering. The model is rep resented by the standing Rossby waves under the state of the balance between a westward propagation speed of Rossby waves and an eastward flow speed. In the steady state of uniform eastward flow, the possible wave number of its Rossby wave is limited due to a finite east-west scale of the Japan Sea. Therefore, it is inferred that successive increase in amplitude occurs according to the value of eastward flow. In the time-varying eastward flow, the asymmetrical response at the periods of increasing and decreasing eastward flow appears due to the different dispersive properties of Rossby waves. To confirm whether the meandering model is represented as the quasi-stationary flow pattern in the TWC, satellite Sea Surface Height Anomaly (SSHA) data and the estimated eastward flow data were used to investigate the interannual variability of TWC-meandering. We conformed that the typical pattern has three major warm regions, i.e., east of Korean Peninsula, north of Oki islands and east of Noto Peninsula. In the 18-year period following 1993, abrupt development and decline of TWC-meandering was observed at three or four times, i.e., about eight-year interval. Using the model, we could almost reproduce the interannual development and decay of the meandering.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 24 (1), 29-47, 2015-01-15

    The Oceanographic Society of Japan

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