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Study on dispersion process on the sea ssurface by tracking GPS drifters

Research Project

Project/Area Number 14540403
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionThe University of Tokyo

Principal Investigator

MICHIDA Yutaka  The University of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所, 助教授 (20323628)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsocean surface / diffusion / drifters / GPS / water exchange / drift prediction / eddy diffisivity
Research Abstract

GPS tracked surface drifters have been developed for observations of fine structure of ocean surface curent field. A compact GPS data logger manufactured by Koden Electronics Co. Ltd., which was originally designed for tracking migrating birds such as albatross, is installed in a container made of strengthening glass. The container is put on the top of a oval float that is drogued with a holey sock to reduce the wind slip effect. This is very low cost drifter comparing with others, because all the parts but GPS are quite common things. A series of preparatory experiments carried out in Tokyo and others, because all the parts but GPS are quite common things. A series of preparatory experiments carried out in Tokyo and other test sites in Japan shows that the accuracy of GPS positioning with the logger is estimated at 5m in average. It means that the accuracy of current measurement with the drifter is expected to be less than 2 cm/s, when the interval of positioning is set to be 5minutes. Four to six drifters were applied to an investigation on the dispersion process of particles on the sea surface. We deployed them in the Otsuchi Bay and tracked them for a couple of hours, in July 2002, January 2003 and July 2003. Although we have still been analyzing the data including error estimations, a preliminary calculation has given estimation for diffusivity in the Bay. We also describe the trajectories of these drifters that provide information on detailed motions of water paticles resulting in the estimated diffusion coefficients. Our experiments have demonstrated the effectiveness of the drifter in observing detailed variability of surface current and applicability to visualization of the coastal current field.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Michida, Y., H.Ishii: "A practical method of current measurement with three -beam type shipmounted ADCP"Journal of Advanced Marine Science and Tehnology Society. 7. 29-44 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Yoritaka, T.Suzuki: "An estimation of wind-driven component in the North Pacific subpolar gyre"Proceedings of 17^<th> International Symposium on Okhotsk Sea and Sea Ice. 38-43 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 道田 豊, 寄高博行: "漂流ブイによる北太平洋亜寒帯の吹送流の評価"月刊海洋. 号外32. 21-25 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Yoritaka: "Seasonal change of the surface circulation in the Alaskan gyre observed with surface drifters"Proceedings of 18^<th> International Symposium on Okhotsk Sea and sea Ice. 90-95 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Aoyagi, M.Inada, H.Otobe: "Development of GPS tracked drifters and application for observation of coastal circulation"Proceedings 1^<st> Joint Seminar on Coastal Oceanography, JSPS. (in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 道田 豊(章執筆分担): "海洋音響の基礎と応用(第17章)P.208-217(海洋音響学会編)"成山堂. 306 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Ishii: "A practical method of current measurement with three-beam type shipmounted ADCP"Journal of Advanced Marine Science and Technology Society. 7. 29-44 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Yoritaka, T.Suzuki: "An estimation of wind-driven component in the North Pacific subpolar tyre"Proceedings of 17^th International Symposium on Okhotsk Sea and Sea Ice. 38-43 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Yoritaka: "Estimation of wind-driven component in the North Pacific by analyzing surface drifter data."Kaiyo Monthly, Extra (in Japanese). 32. 21-25 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Yoritaka: "Seasonal change of the surface circulation in the Alaskan gyre observed with surface drifters"Proceedings of 18^th International Symposium on Okhotsk Sea and Sea Ice. 90-95 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y., H.Aoyagi, M.Inada, H.Otobe: "Development of GPS tracked drifters and application for observation of coastal circulation"Proceedings 1^st Joint Seminar on Coastal Oceanography, JSPS. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Michida, Y.: "(in Japanese)"Ocean Observations (Chap.17 in 'Fundamentals and Application of Marine Acoustics') (Seizando, ed./ mrine Acoustics Society of Japan). 306 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 道田 豊, 寄高博行: "漂流ブイによる北太平洋亜寒帯の吹送流の評価"月刊海洋. 号外32. 21-25 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 鈴木 亨, 小熊幸子, 永田 豊, 道田 豊, 寄高博行: "ADCP観測データで見る北太平洋亜寒帯西部における表層循環の季節変動"月刊海洋. 号外32. 26-31 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Michida, Y., H.Yoritaka: "Seasonal change of the surface circulation in the Alaskan gyre observed with surface drifters"Proceedings of 18^<th> International Symposium on Okhotsk Sea and Sea Ice. 90-95 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Mchida, Y., H.Aoyagi, M.Inada, H.Otobe: "Development of GPS tracked drifters and application for observation of coastal circulation"Proceedings 1^<st> Joint Seminar on Coastal Oceanography, JSPS. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 道田 豊(章執筆分担): "海洋音響の基礎と応用"海洋音響学会(印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Michida, Y., H.Ishii: "A practical method of current measurement with three-beam type shipmounted ADCP"Journal of Advanced Marine Science and Technology Society. Vol.7. 29-44 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Michida, Y., H.Yoritaka, T.Suzuki: "An estimation of wind-driven component in the North Pacific subpolar gyre"Proceedings of 17^<th> International Symposium on Okhotsk Sea and Sea Ice. 38-43 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 道田豊, 寄高博行: "漂流ブイによる北太平洋亜寒帯の吹送流の評価"月刊海洋. 号外32. 21-25 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 鈴木亨, 小熊幸子, 永田 豊, 道田 豊, 寄高博行: "ADCP観測データで見る北太平洋亜寒帯西部における表層循環の季節変動"月刊海洋. 号外32. 26-31 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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