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A Study on Generation and Maintenance of Hawaiian Rainbands

Research Project

Project/Area Number 63044108
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionKyushu University

Principal Investigator

TAKAHASHI Tsutomu  Kyushu University, the Faculty of Science・Professor, 理学部, 教授 (20197742)

T Takahashi (1990)  九州大学, 理学部, 教授

Co-Investigator(Kenkyū-buntansha) YASUI Motoaki  Kyushu University, the Faculty of Science, Research Associate, 理学部, 助手 (80220143)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥11,000,000 (Direct Cost: ¥11,000,000)
Fiscal Year 1990: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1989: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1988: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsRainbands / Squall Lines / 降水 / 氷晶 / 雨滴
Research Abstract

Data obtained from aircraft observations around the island of Hawaii during the 1985 Joint Hawaii Warm Rain Project was analyzed pertaining to the microphysical, thermodynamic and dynamic character of rainbands. Analysis focused upon rain duration and rain accumulation. The most outstanding feature of long-lasting trade-wind rainbands is that unlike other storm systems, dry air does not intrude into the main cloud system at low levels. Vertical wind profiles were the primary factor to determine the strength of rainbands. Parabolic winds were the best to form strong rainbands, attributing to the formation of strong rainbands through the transport of momentum by precipitaion.
In order to increase our understanding of Hawaiian rainbands, Hawaii Rainband Project was held again in 1990. Electra aircraft, two doppler radars as well as 50 surface networks were incorporated to this project.
In order to extend our study to west Pacific equatorial squall lines, precipitation mechanism in the squall lines at Ponape, Micronesia was investigated by the use of special radiosondes. A unique rainwater accumulation process involving frozen raindrop hail formation was found to take place in a narrow layer of altitude just above the freezing level. Three dimensional cloud model showed longer and more intense rainfall with ice even in maritime cumulus clouds.

Report

(1 results)
  • 1990 Final Research Report Summary
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 高橋 劭: "Longーlasting trade wind rainbandsーthree dimensional model." Journal of the Atmospheric Sciences. 45. 3333-3353 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 高橋 劭、米山 邦夫、坪田 幸政: "Longーlasting trade wind rainbandsーaircraft observation." Journal of the Atmospheric Sciences. 46. 937-955 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 高橋 劭: "Near absence of lightning in torrential rainfall producing micronesian thunderstorms." Gepohysical Research Letter. 2381-2384 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 高橋 劭、米山 邦夫、三浦 和彦: "Rain characteristics of Hawaiian rainband."

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 高橋 劭、遊馬 芳雄: "Precipitation mechanisms in three dimensional shallow cloud model"

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takahashi, T.: "Long-lasting trade wind rainbands-three dimensional model." Journal of the Atmospheric Sciences. 45. 3333-3353 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takahashi, T., K. Yoneyama and Y. Tsubota: "Long-lasting trade wind rainbands-aircraft observation." Journal of the Atmospheric Sciences. 46. 937-955 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takahashi, T.: "Near absence of lightning in torrential rainfall producing Micronesian thunderstorms." Geophysical Research Letter. 2381-2384 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takahashi, T. , K. Yoneyama and K. Miura: "Rain characteristics of Hawaiian rainband." Prepared for the submission.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Takahashi, T. and Y. Asuma: "Precipitation mechanisms in three dimensional shallow cloud model" prepared for the submission.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary

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Published: 1988-04-01   Modified: 2016-04-21  

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