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Simulation of the hierarchy structure in tropical disturbances by a three-dimensional model treating the cloud physical process

Research Project

Project/Area Number 01540342
Research Category

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

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionWakayama University

Principal Investigator

ITOH Hisanori  Wakayama Univ., Education, Associate Professor, 教育学部, 助教授 (80112100)

Co-Investigator(Kenkyū-buntansha) TOKOI Kohe  Wakayama Unie., Economics, Associate Professor, 経済学部, 助教授 (70188746)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
KeywordsIntraseasonal oscillation / Cumulus convection / Cloud physics / Hierarchy structure / 雲物理
Research Abstract

Tropical disturbances generally have the hierarchy structure. The typical example is the intraseasonal oscillation in which superclusters having the scale of 1, 000km are composed of mesoscale convection having the scale of lOOkm. The aim of this research is to simulate this hierarchy structure of tropical disturbances, using a model with Yamasaki's parameterization. In this parameterization, cloud water and rainwater as well as water vapor are predicted, and meso-scale convection can be resolved explicitly. The grid length is as fine as 40km in the tropics. Therefore, we can perform a qualitatively different experiment from previous ones. The surface is covered with the ocean whose temperature is zonally uniform and symmetric with respect to the equator.
In the simulation, convection near the equator is suppressed and the supercluster does not appear ; the hierarchy structure associated with the intraseasonal oscillation is not well simulated. However, the ITCZ is formed along about 10゚N and 10゚S, and ITCZ disturbances show the hierarchy structure. That is, their scales are 1, 000km or more, and are composed of meso-scale convection with the scale of 100km. The disturbances generally move westward, while the meso-scale convection is almost stationary. Also in this respect, the characteristics of the hierarchy structure are simulated. Further, it is suggested that these results are attributed to several inherent effects of this model.
In the future, sensitivity experiments must be carried out. In particular, an experiment for radiative cooling is important, because this affects the static stability, which in turn has a great influence on the activity of convection near the equator and the moving direction of disturbances. The hierarchy structure associated with the intraseasonal oscillation will probablyappear in this course.

Report

(3 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Hisanori Itoh: "Considerations for the structure of the tropical intraseasonal oscillation" J.Meteor.Soc.Japan. 68. 659-675 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hisanori Itoh: "The mechanism for the scale selection of tropical intraseasonal oscillations.Part II:Meso-scale convection and superclusters appearing in a model treating cloud water and rainwater" J.Meteor.Soc.Japan. 70. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hisanori Itoh: "Considerations for the structure of the tropical intraseasonal oscillation" J. Meteor. Soc. Japan. 68. 659-675 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hisanori Itoh: "The mechanism for the scale selection of tropical intraseasonal oscillations. Part II : Meso-scale convection and superclusters appearing in a model treating cloud water and reinwater" J. Meteor. Soc. Japan. 70. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Hisanori Itoh: "Considerations for the structure of the tropical intraseasonal oscillation" J.Meteorological Society of Japan. 68. 659-675 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Hisanori Itoh: "The role of the nonlinearity and tropicsーextratropics interaction in the structure of the tropical intraseasonal oscillation" J.Meteorological Society of Japan. 69. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Hisanori Itoh,Noriyuki Nishi: "Considerations of the structure of the tropical intraseasonal oscillation" J.Meteor.Soc.Japan. 68. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hisanori Itoh: "Slowlyーmoving mode interacting with cumulus convection and the tropical intraseasonal oscillation" J.Meteor.Soc.Japan. 68. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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