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1996 Fiscal Year Final Research Report Summary

Measurements of volume and heat transport of the surface Kuroshio

Research Project

Project/Area Number 07454112
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKyushu University

Principal Investigator

IMAWAKI Shiro  Kyushu University, Res.Inst.for Appl.Mech., Professor, 応用力学研究所, 教授 (40025474)

Co-Investigator(Kenkyū-buntansha) KANEKO Arata  Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (10038101)
UMATANI Shin-ichiro  Kyushu University, Res.Inst.for Appl.Mech., Research Associate, 応用力学研究所, 助手 (30112353)
OSTROVSKII Alexander  Kyushu University, Res.Inst.for Appl.Mech., Associate Professor, 応用力学研究所, 助教授 (70243962)
TAKEMATSU Masaki  Kyushu University, Res.Inst.for Appl.Mech., Professor, 応用力学研究所, 教授 (50038535)
Project Period (FY) 1995 – 1996
KeywordsKuroshio / transport / ADCP
Research Abstract

Intensive surveys of the Kuroshio off Shikoku were carried out during 1993-1995 along a subsatellite track of the altimeter satallite TOPEX/POSEIDON.Hydrographic surveys and towed-ADCP (acoustic Doppler current profiler) surveys were carried out repeatedly along the line. Data from those observations as well as moored current measurements were analyzed synthetically. The following results were obtained ;
(1) Two modes of the surface Kuroshio were detected by the repeated towed-ADCP surveys : one is the Kuroshio flowing very close to the coast and the other is that flowing far offshore.
(2) Very strong flows (up to 100 cm/sec) and very strong vertical shears (stronger than 0.01 sec^<-1>) were observed around 300m depth by a moored-ADCP.
(3) Generally, geostrophic shears estimated from the repeated hydrographic survey data compare well with vertical shears obtained from the direct current measurement data, but the abovementioned strong shears were not able to be estimated from the present hydrographic data.
(4) Tide gauge data at a coastal station were compared with satellite altimetry data successfully and found to represent well the sea level fluctuations on the coastal side of the Kuroshio.
(5) On the basis of combination of those in situ oceanographic data and satellite altimetry data, a three-year long time series of the Kuroshio transport was obtained with ten-day resolution. The results show that there are not apparent seasonal signals in the estimated fluctuations, which fact gives us a very important and interesting task in the future.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 今脇 資郎: "Strategy for long-term monitoring of the Kuroshio transport" Proc.Intl.Workshop on NumericalPrediction of Oceanic Variability. 75-78 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 今脇 資郎: "海面高度計による黒潮横断水位分布の検出" 京都大学防災研究所研年報. 38B-2. 655-662 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中嶋 秀夫: "Sea surface measurement by a self-contained upward-looking ADCP" J.Meteorol.Soc.Jpn.73. 639-643 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 内田 裕: "衛星海面高度計と潮位計による四国沖の水位変化の比較" 九州大学応用力学研究所所報. 80. 71-85 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 今脇 資郎: "Time series of the Kuroshio transport derived from field observations and altimetry data" International WOCE Newsletter. 25. 15-18 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shiro Imawaki: "Strategy for long-term monitoring of the Kuroshio transport" Proc.Intl.Workshop on Numerical Predicton of Ocean Variability. 75-78 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro Imawaki: "Detecting sea level profiles across the Kuroshio by a satellite altimeter." Annuals Disaster Prevention Res.Inst., Kyoto Univ.No.38B-2. 655-662 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hideo Nakajima: "Sea surface measurement by a self-contained upward-looking ADCP." J.Meteorol.Soc.Japan. Vol.73. 639-643 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Uchida: "Comparison of sea-level fluctuations off Shikoku derived from satellite altimeter and tide gauge." Bull.Res.Inst.for Appl.Mech., Kyushu Univ.No.80. 71-85 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro Imawaki: "Time series of the Kuroshio transport derived from field observations and altimetry data." Intl.WOCE Newsletter. No.25. 15-18 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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