海洋生態系に関わる親潮・黒潮海域の水塊と変動に関する研究  [in Japanese] Studies on water mass variability related to dynamics of ecosystems in the Oyashio/Kuroshio region  [in Japanese]

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Abstract

<p>黒潮・親潮域は亜熱帯・亜寒帯域起源の水塊や物質,生物相が近接し,豊かで多様な生態系を成している。筆者は,黒潮・親潮域生態系の理解を進めるため,連鎖の起点である海洋物理過程と,高次栄養段階に位置する海洋生物資源の動態の両面から研究に取り組んできた。対象としてきた物理現象は,中規模渦,前線波動,潮汐による乱流鉛直混合で,数値実験,現場観測,および既往データ解析によって現象の構造や動態を調べてきた。これらの研究により,(1)黒潮系暖水塊を中心とする中規模渦の挙動,構造と水塊特性,移動機構,熱および物質輸送,(2)黒潮前線波動の構造,伝播・エネルギー特性,(3)千島海峡域の乱流鉛直混合強度,強乱流励起過程,および中層水塊形成への影響が解明されてきた。海洋生物資源に関しては,黒潮・親潮域生態系の鍵種であるマイワシ・カタクチイワシに焦点を当て研究を行ってきた。粒子追跡実験および現場での調査,仔魚の耳石日輪分析により,両種の輸送環境,経験水温と再生産成功率の関係を明らかにしたほか,仔魚の経験環境履歴を推定する手法を開発した。本稿ではこれらの研究内容について概説する。</p>

<p>In the Kuroshio/Oyashio region, water masses, materials, and biota that originated from subtropical and subarctic regions come together, giving rise to a rich and diverse ecosystem. To understand the dynamics of the Kuroshio/Oyashio ecosystem, the author has studied processes of both physical oceanography and fisheries oceanography in the region. Physical oceanographic phenomena, such as mesoscale eddies, frontal waves, and tidal mixing, were investigated by various approaches, including field observations, numerical simulations, and analysis of existing datasets, including satellite data. These studies revealed (1) the behavior, structure and water mass characteristics, movement mechanism, and heat and material transport properties of mesoscale eddies in the Kuroshio-Oyashio extension region; (2) the structure, propagation, and energetics of Kuroshio frontal waves;and (3) turbulent mixing intensity in the Kuril Straits, the mechanism of mixing, and its impact on the formation of intermediate waters. In terms of fisheries oceanographic issues, the author has focused on the sardine and anchovy, which are key species of the Kuroshio/Oyashio ecosystem. These studies quantify larval transport processes, clarify the relationship between temperature and recruitment rate, and propose a method of estimating the environmental history of larvae sampled in the field. The results of these analyses are reviewed in this article.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 21(2), 33-50, 2012-03-15

    The Oceanographic Society of Japan

References:  70

Codes

  • NII Article ID (NAID)
    110009437705
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09168362
  • NDL Article ID
    023659552
  • NDL Call No.
    Z15-778
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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