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A Study of Mechanism of "Yamase" Events and Their Prediction

Research Project

Project/Area Number 05452373
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Natural disaster science
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

ASAI Tomio  Hiroshima University Faculty of Integrated Arts and Sciences Professor, 総合科学部, 教授 (80025288)

Co-Investigator(Kenkyū-buntansha) TKAHASHI Hideo  Hiroshima University Faculty of Integrated Arts and Sciences Research Associate, 総合科学部, 助手 (40202155)
RIKIISHI Kunio  Hirosaki University Faculty of Science Associate Professor, 理学部, 助教授 (70038561)
HUKUOKA Yoshitaka  Hiroshima University Faculty of Integrated Arts and Sciences Professor, 総合科学部, 教授 (00007361)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsYamase / northeasterly wind / anomalous weather / cool summer / atmospheric boundary layr / northeast part of Japan / airmass transformation / 混合層モデル / 湿潤対流混合層 / 放射冷却 / エントレインメント / オホーツク海高気圧
Research Abstract

Observational and theoretical studies have been made to understand mechanism of "Yamase" and the results obtained are summarized as follows.
1. A composite analysis of the five-day mean 500 hPa weather charts for summer seasons from 1958 to 1989 has been performed and the characteristic atmospheric circulation pattern is found to be associated with Yamase-type weather in the northern Japan.
A factorial analysis is applied to the daily mean temperature anomalies obtained at the 16 weather stations in the east side of the northern Japan during June and July for the three years from 1990 to 1992. Anomalously low temperatures on the Pacific Ocean side are observed about 2 days later than those in the Okhotsk Sea side.
2. A mechanism to cause the cool and humid weather in Yamase events is investigated with use of a two-dimensional numerical model which includes processes of cloud formation and long-wave radiation. A prediction experiment has also been made for the remarkable Yamase period from 17th to 19th July 1993 with use of a revised version of the Japan Spectral Model, JMA.
The following three problems are shown to be crucial to clarify mechanism of intense Yamase events with fog and/or stratus : (1) thermodynamical conditions of the lower atmosphere in the high pressure system over Okhotsk Sea, (2) role of surface buoyancy flux during the southward movement of cooled airmass from Okhotsk Sea, and (3) interaction among a) amount of water vapor phase change b) cooling rate of cloud-top radiation and c) rate of entrainment into a mixed layr on the evolution of the moist convective mixed layr.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] 浅井,冨雄: "異常気象と災害" 予防時報. 172. 20-26 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 浅井,冨雄: "集中豪雨雪の機構と予測" 学術月報. 47. 1111-1118 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 福岡,義隆: "古日記による小氷期の気候復元に関する年輪気候学的研究" 地学雑誌. 102. 119-124 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 福岡,義隆: "風穴の微気象に関する研究" 気象利用研究. 7. 13-16 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 力石,國男・飯田,秀重・青木,亮太: "ヤマセに見る大気-海洋-雪氷圏の相互作用" 海洋. 号外6号. 66-73 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 力石,國男: "北日本の冷害と地球環境" 弘前大学・理学部・寒地気象実験室報告. 6. 1-12 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Takahashi,Hideo: "Synoptic condition over East Asia during the early-summer rainy season(Baiu season)from the point of view of the temporal continuity of rainfall in the southwestern part of Japan." Journal of the Meteorological Society of Japan. 71. 611-632 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Takahashi,Hideo: "Secular variation in rainfall distribution and monsoon circulation over tropical Asia." Proceedings of International Symposium on Paleoenvironmental Change in Tropical-Subtropical Monsoon Asia(IGBP-PAGES Symposium).(in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] ASAI,Tomio: "Unusual weather and meteorological disasters." Yobo-jiho. 172. 20-26 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] ASAI,Tomio: "Mechanism of heavy precipitation and its prediction and its prediction." Japanese Scientific Monthly. 47. 1111-1118 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] HUKUOKA,Yoshitaka: "The dendroclimatological study on the climate reconstruction of Little Ice Age by old diaries." Journal of Geography. 102. 119-124 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] HUKUOKA,Yoshitaka: "Micrometeorological study on wind cavity" Applied Meteorology and Climate Resources. 7. 13-16 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] RIKIISHI,Kunio et al: "Interaction among atmosphere, Ocean and cryosphere in Yamase events." Kaiyo Extra. 6. 66-73 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] RIKIISHI,Kunio: "Cold-weather damage in northern Japan and global enyironment." Annual Report of Cold Regions Meteorology Laboratory, Faculty of Science, Hirosaki University. 6. 1-12 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] TAKAHASHI,Hideo: "Synoptic condition over East Asia during the early-summer rainy season (Baiu season) from the point of view of the temporal continuity of rainfall in the southwestern part of Japan." Journal of the Meteorological Society of Japan. 71. 611-632 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] TAKAHASHI,Hideo: "Secular variation in rainfall distribution and monsoon circulation over tropical Asia." Proceedings of International Symposium on Paleoenvironmental Change in Tropical-Subtropical Monsoon Asia (IGBP-PAGES Symposium). (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 浅井,冨雄: "異常気象と災害" 予防時報. 172. 20-26 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 浅井,冨雄: "集中豪雨雪の機構と予測" 学術月報. 47. 1111-1118 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 福岡,義隆: "古日記による小氷期の気候復元に関する年輪気候学的研究" 地学雑誌. 102. 119-124 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] 福岡,義隆: "風穴の微気象に関する研究" 気象利用研究. 7. 13-16 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 力石,國男・飯田,秀重・青木,亮太: "ヤマセに見る大気-海洋-雪氷圏の相互作用" 海洋. 号外6号. 66-73 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 力石,國男: "北日本の冷害と地球環境" 弘前大学・理学部・寒地気象実験室報告. 6. 1-12 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Takahashi,Hideo: "Synoptic condition over East Asia during the early-summer rainy season (Baiu season) from the point of view of the temporal continuity of rainfall in the southwestern part of Japan." Journal of the Meteorological Society of Japan. 71. 611-632 (1993)

    • Related Report
      1994 Annual Research Report
  • [Publications] Takahashi,Hideo: "Secular variation in rainfall distribution and monsoon circulation over tropical Asia." Proceedings of International Symposium on Paleoenvironmental Change in Tropical-Subtropical Monsoon Asia (IGBP-PAGES Symposium).(in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 浅井 冨雄: "冬季日本海上に発生する帯状雲と小低気圧の数値実験" 天気. 40. 388-392 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Tomio Asai et,al: "Observation of Temperature and Velocity from a Surface Buoy Moored in the Shikoku Basin(OMLET-88)-An Oceanic Response to a Typhoon-" Journal of Oceanography. 49. 397-406 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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