Modeled response of the East China Sea shelf water to wind forcing

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  • Moon Jae-Hong
    Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 広瀬 直毅
    九州大学応用力学研究所

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Seasonal variation of the East China Sea (ECS) shelf water in response to wind forcing is examined using a northwestern Pacific model. By comparison of the simulations with wind and without wind conditions, in winter strong northeasterly wind significantly weakens the Taiwan Warm Current entering the ECS shelf through the Taiwan Strait, and plays a role in intensifying onshore Kuroshio intrusion northeast of Taiwan. Contribution of the Taiwan Warm Current water and Kuroshio water to the property of ECS shelf water is estimated by releasing two separate tracers into the model. With wind forcing the tracer contribution from the Taiwan Strait shows a minimum in winter and maximum in summer, while that from the Kuroshio has an opposite seasonal contribution to that from the Taiwan Strait. Therefore, origin of the material passing through the Korea/Tsushima Strait varies seasonally. When wind forcing is not applied to the model, however, the seasonal variability almost disappears, implying that contributions from the tracers are direct consequences of the seasonal variation of the Taiwan Warm Current and onshore Kuroshio intrusion due to wind forcing. Furthermore, the shelf water changes seasonally regardless of Ekman transport across the ECS shelf break. This suggests that the variability of the shelf water could be controlled by changes in the strength of the Taiwan Warm Current driven by wind over the strait, which appear to block the Kuroshio water on the shelf and thus prevent the onshore Kuroshio intrusion northeast of Taiwan.

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