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Formation conditions for "abyssal oasis" east of Ogasawara Islands

Research Project

Project/Area Number 26400468
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKyushu University

Principal Investigator

Ichikawa Kaoru  九州大学, 応用力学研究所, 准教授 (40263959)

Co-Investigator(Kenkyū-buntansha) 宮澤 泰正  国立研究開発法人海洋研究開発機構, アプリケーションラボ, グループリーダー (90399577)
Research Collaborator TANAKA Yuhei  東京都小笠原水産センター, 研究員
KOYAMA Yasuhiro  NHK, エンタープライズ深海プロジェクト, ディレクター
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords深海漁場 / 内部潮汐 / メカジキ / 漁獲位置分布 / 高分解能数値モデル / 潮流の収束・発散 / 深部音響反射層 / 小笠原諸島 / 漁獲位置情報 / 高分解能データ同化モデル / 収束・発散 / 深海音響散乱層 / 定点連続観測 / 中規模渦 / 深海生物漁場 / 流速プロファイル / ダイオウイカ / 立縄漁
Outline of Final Research Achievements

Biological activities are generally low in the center of the Pacific subtropical gyre where Ogasawara islands locate. But abyssal fishing there is locally quite active, as an "oasis". Exact abyssal fishing points are newly recorded, and they are found to locate at the edge of propagation areas of internal tides. Significant divergence/convergence of horizontal internal tidal currents are recognized in these areas, and they are confirmed to be related with disappearance/appearance of the deep scattering layers of sound echos. These suggests that zooplankton sinking in the daytime are accumulated at a place by convergence of horizontal internal tidal currents, so that an abyssal fishing point is formed at the point.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (5 results)

All 2016 2015 2014 Other

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Acknowledgement Compliant: 1 results) Presentation (2 results) Remarks (2 results)

  • [Journal Article] M2 baroclinic tide variability modulated by the ocean circulation south of Japan2015

    • Author(s)
      Verlamov, S.M., X. Guo, T. Miyama, K. Ichikawa, T. Waseda and Y. Miyama
    • Journal Title

      Journal of Geophysical Research

      Volume: 120 (C5) Issue: 5 Pages: 3681-3710

    • DOI

      10.1002/2015jc010739

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] 内部潮汐が父島周辺のメカジキの漁獲量変動に与える影響評価2016

    • Author(s)
      浅田凌・市川香・田中優平・S.M. Varlamov・宮澤泰正
    • Organizer
      日本海洋学会2016年度秋季大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2016-09-11
    • Related Report
      2016 Annual Research Report
  • [Presentation] 小笠原沖深海のダイオウイカの出現予測2014

    • Author(s)
      市川香・宮澤泰正
    • Organizer
      RIAMフォーラム2014
    • Place of Presentation
      九州大学筑紫キャンパス
    • Year and Date
      2014-06-06
    • Related Report
      2014 Research-status Report
  • [Remarks] JCOPE-Tによる予測

    • URL

      http://www.jamstec.go.jp/jcope/vwp/ogasawara2/index.html

    • Related Report
      2016 Annual Research Report
  • [Remarks] 小笠原海域ウェッブサイト

    • URL

      http://www.jamstec.go.jp/jcope/vwp/ogasawara2/

    • Related Report
      2015 Research-status Report

URL: 

Published: 2014-04-04   Modified: 2018-03-22  

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