黒潮の流路・流量変動の研究:─源流域から九州東岸まで─  [in Japanese] Kuroshio path and volume transport variations from Luzon Island to the eastern coast of Kyushu  [in Japanese]

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Abstract

<p>本総説の目的は,黒潮流路と流量の季節変動と経年・十年規模変動について,ルソン島沖から九州東岸沖までを俯瞰し,海域毎の共通点と相違点を認識することによって,より包括的な黒潮理解の枠組みを築く手がかりを示すことである。特に,季節変動を支配する力学を掘り下げる。例えば,黒潮流路の季節変動については,ルソン海峡での黒潮のループ流路,台湾北東方の黒潮の陸棚上への貫入,九州東方の黒潮小蛇行といった鍵現象のいずれも,冬季に発生する点で共通している。一方,黒潮流量は,多くの流域で夏季に多く,秋~冬季に少ないという観測事実がある(フロリダ海流も同様である)。これらの現象の普遍的メカニズムとして,内部領域の風応力場に対する遠隔応答(スベルドラップ応答)の他に,黒潮上の風応力場に対する非線形エクマン応答や大陸棚斜面に沿った地形性ロスビー波応答といった西岸境界層内の局所プロセスと遠隔プロセスの重要性を指摘する。経年・十年規模変動では,スベルドラップ応答が支配的な力学となるが,局所応答が重要である現象も認められる。</p>

<p>This review provides new insight for future studies of the mechanisms underlying seasonal, interannual and interdecadal variations in the Kuroshio path and volume transport. The variations are summarized based on both observations and theories over the entire Kuroshio region from Luzon Island to the eastern coast of Kyushu. Additionally, the common features and differences are clarified, particularly by focusing on the dynamics that govern seasonal variations. In almost all Kuroshio regions, the Kuroshio path tends to meander in the winter, while a straight path state is observed in the summer, and volume transport is generally largest in summer. The important dynamics that govern these seasonal variations include local and remote processes in the western boundary region, such as nonlinear Ekman dynamics over the jet and wave dynamics along the continental slope. Interannual and interdecadal variations are mainly governed by conventional Sverdrup dynamics, but there are cases where such variations are affected by these local processes.</p><p>Interannual and interdecadal variations, Remote response</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 26(4), 113-147, 2017

    The Oceanographic Society of Japan

Codes

  • NII Article ID (NAID)
    130007482641
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • ISSN
    0916-8362
  • NDL Article ID
    028468852
  • NDL Call No.
    Z15-778
  • Data Source
    NDL  J-STAGE 
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