Modeling of the branches of the Tsushima Qarm Current in the eastern Japan Sea

Hideyuki Kawamura, Toshimichi Ito, Naoki Hirose, Tetsutaro Takikawa, Jong Hwan Yoon

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The branches of the Tsushima Warm Current (TWC) are realistically reproduced using a three-dimensional ocean general circulation model (OGCM). Simulated structures of the First Branch and the Second Branch of the TWC (FBTWC and SBTWC) in the eastern Japan Sea are mainly addressed in this study, being compared with measurement in the period September-October 2000. This is the first numerical experiment so far in which the OGCM is laterally exerted by real volume transports measured by acoustic Doppler current profiler (ADCP) through the Tsushima Straits and the Tsugaru Strait. In addition, sea level variation measured by tide-stations along the Japanese coast as well as satellite altimeters is assimilated into the OGCM through a sequential data assimilation method. It is demonstrated that the assimilation of sea level variation at the coastal tide-stations is useful in reproducing oceanic conditions in the nearshore region. We also examine the seasonal variation of the branches of the TWC in the eastern Japan Sea in 2000. It is suggested as a consequence that the FBTWC is continuous along northwestern Honshu Island in summertime, while it degenerates along the coast between the Sado Strait and the Oga Peninsula in other seasons. On the other hand, a mainstream of the SBTWC exists with meanders and eddies in the offshore region deeper than 1000 m to the north of the Sado Island throughout the year.

    Original languageEnglish
    Pages (from-to)439-454
    Number of pages16
    JournalJournal of Oceanography
    Volume65
    Issue number4
    DOIs
    Publication statusPublished - Dec 28 2009

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    strait
    general circulation model
    tide
    ocean
    sea level
    modeling
    volume transport
    coast
    Acoustic Doppler Current Profiler
    meander
    altimeter
    data assimilation
    eddy
    seasonal variation
    sea
    experiment
    station
    assimilation
    method

    All Science Journal Classification (ASJC) codes

    • Oceanography

    Cite this

    Modeling of the branches of the Tsushima Qarm Current in the eastern Japan Sea. / Kawamura, Hideyuki; Ito, Toshimichi; Hirose, Naoki; Takikawa, Tetsutaro; Yoon, Jong Hwan.

    In: Journal of Oceanography, Vol. 65, No. 4, 28.12.2009, p. 439-454.

    Research output: Contribution to journalArticle

    Kawamura, Hideyuki ; Ito, Toshimichi ; Hirose, Naoki ; Takikawa, Tetsutaro ; Yoon, Jong Hwan. / Modeling of the branches of the Tsushima Qarm Current in the eastern Japan Sea. In: Journal of Oceanography. 2009 ; Vol. 65, No. 4. pp. 439-454.
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