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Study on the formation process of warm rain using quasi-real scale artificial cloud experimental system

Research Project

Project/Area Number 06452081
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

HARIMAYA Toshio  Hokkaido University, Graduate School of Science, Professor., 大学院・理学研究科, 教授 (90001859)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Tsuneya  Hokkaiso University of Education, Faculty of Education, Associate Professor., 教育学部, 助教授 (60236297)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥5,800,000 (Direct Cost: ¥5,800,000)
Keywordsartificial cloud experimental system / warm rain / aerosol number concentration / cloud condensation nuclei / size distribution of cloud droplet / elemental component of aerosol / エ-ロゾル数濃度 / エ-ロゾル組成
Research Abstract

The initiation of warm rain is critically dependent on the presence of cloud droplets larger than 50mum in diameter. The conditions that determine the size distribution of cloud droplets was studied using a quasi-real scale artificial cloud experimental system. Many parameters affect the size distribution of cloud droplets. From observations of the size distribution of cloud droplets that were formed on various aerosol concentrations introduced into a vertical shaft, it was proved in practice that a large number of small-sized cloud droplets are formed in the case of a high CCN concentration and a small number of large-size cloud droplets are formed in the case of a low CCN concentration.
Next, numerical simulations were carried out under the conditions that air parcels move upward in the shaft and grow into cloud droplets by condensation. The effects of only the relative humidity at the bottom of the shaft and only differences in CCN spectra on the cloud droplet spectra were quantitatively estimated.
The artificial cloud experimental system was later transferred from Kamisunagawa to Kamaishi, but experimental studies were continued. Using the previous numerical model of cloud droplets formed by condensation, the effects of only the elemental components of aerosol and only the vertical velocity on the cloud droplet spectra were quantitatively estimated. The results elucidated the formation mechanism of warm rain.

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] A.Sasaki: "Microphysical process of clouds formed in the artificial cloud experimental system" Proceedings of 12th International Conference on Cloud and Precipitation. 1. 286-289 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 山田 正: "準スケールの雲物理実験と降雨モデルによる雲の微物理過程の考察" 土木学会論文集. No.509/II-30. 1-13 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Sasaki: "Microphysical process of clouds formed in the artificial cloud experimental system" Proceeding of 12th International Conference on Cloud and Precipitation. 1. 286-289 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Yamada: "Prototype experiment of cloud physics using the long vertical shaft in a mine" Journal of Hydraulic Coastal and Enivronmental Engineering. No.509/II-30. 1-13 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] A.Sasaki: "Microphysical process of clouds formed in the artificial cloud experimental system" Proceedings of 12th International Conference on Cloud and Precipitation. 1. 286-289 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 山田 正: "実スケールの雲物理実験と降雨モデルによる雲の微物理過程の考察" 土木学会論文集. No.504. 30-39 (1955)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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