Internal tide-induced enhancement of cold water intrusion on the continental shelf of the Korea strait

Jae Hun Park, Ye Sol Kim, Ho Jin Lee, Hee Yeol Lee, Ho Kyung Ha, Young Gyu Park, Chanhyung Jeon, Naoki Hirose

    Research output: Contribution to journalConference articlepeer-review

    1 Citation (Scopus)

    Abstract

    The Korea Strait bottom cold water (KSBCW), characterized by its temperature < 10°C, is believed to originate from the deep basin of the southwestern East/Japan Sea with a maximum transport in August/September. Although previous studies have suggested possible causes of the enhanced KSBCW intrusion in summer, its mechanism is not yet clear. Here we investigate if tides can affect the strength of KSBCW intrusion using numerical simulations. We utilize a high-resolution regional ocean model with 1/108° grids, covering the Korea Strait and the southwestern East/Japan Sea. Numerical simulations are conducted for several cases, which include semidiurnal tides (M2+S2), diurnal tides (K1+O1), and wind forcings differently to examine their effects on the intrusion. Simulation results reveal that the energetic semidiurnal internal tides, generated around the continental shelf in the northern part of the Korea Strait, can induce the KSBCW intrusion by the internal tidal pumping effect. Two cases including the four major tides reproduce at best a dome-shaped bottom cold water lower than 10°C impinging on the slope southeast coast of Korea, consistent with historical monthly-mean temperature fields. Long-term ferry boat ADCP measurements (> 10 years) across the Korea Strait show that southwestward KSBCW intrusions get stronger 2-3 days after spring tides in summer and fall when the semidiurnal internal tides are strengthened, supporting our simulation results. We therefore propose that the maximum KSBCW intrusion in August/September is caused by the energetic semidiurnal internal tides.

    Original languageEnglish
    Pages (from-to)542-546
    Number of pages5
    JournalJournal of Coastal Research
    Volume1
    Issue number75
    DOIs
    Publication statusPublished - Mar 1 2016
    Event14th International Coastal Symposium, ICS 2016 - Sydney, Australia
    Duration: Mar 6 2016Mar 11 2016

    All Science Journal Classification (ASJC) codes

    • Ecology
    • Water Science and Technology
    • Earth-Surface Processes

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