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Effects of aerosols on intensity and structure of tropical cyclones

Research Project

Project/Area Number 19K21053
Project/Area Number (Other) 18H05872 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionKeio University

Principal Investigator

MIYAMOTO Yoshiaki  慶應義塾大学, 環境情報学部(藤沢), 講師 (90612185)

Project Period (FY) 2018-08-24 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords台風 / 熱帯低気圧 / エアロゾル
Outline of Research at the Start

台風は、海から流入した水蒸気が中心付近で凝結して生じる運動エネルギーで駆動する。即ち、中心付近に存在する眼の壁雲で常に水蒸気が凝結する必要がある。凝結(水滴の形成)には、凝結核が必須であり、大気中に浮遊するエアロゾルが凝結核となる。さらに凝結核の数によって、対流雲の構造が変化することが提唱されている。つまり、エアロゾルの数濃度によって眼の壁雲での凝結分布が変化し、台風に影響すると考えられる。そこで本研究では、台風の強度・構造に対するエアロゾルの影響を包括的に理解することを目的とする。

Outline of Final Research Achievements

Tropical Cyclones (TCs) are driven by latent heat released by forming clouds in the core region. TC intensity and structure depend on spatial distribution of latent heating. To form cloud droplets, cloud condensation nucleai (CCN) are essentially needed and structure of cloud depends on the number of CCN. Although some recent studies have investigated the impacts of aerosols on TCs, they examined case studies and mainly focused on impacts on clouds in TC. Hence, it is necessary to deepen the basic understanding of the impacts of aerosol on TCs. This study aims to examine the sensitivity of TC intensity and structure to the number density of aerosol. For this purpose, we conducted a set of numerical simulations using a meteorological model with a bin-microphysics model by changing the number density of aerosol.

Academic Significance and Societal Importance of the Research Achievements

これまでエアロゾルの影響は、層積雲や積雲などで主に研究されてきた。近年では台風への影響も調べ始められているものの、事例研究が多く理解は進んでいない。本研究では、理想的な台風の計算条件にエアロゾルの効果だけを追加して計算を行ったため、純粋なエアロゾルの影響を議論できたと考えられる。近年の産業発展により人為起源のエアロゾルが増加しており、さらに温暖化によって中緯度まで強い台風が到達している。つまりエアロゾルの影響は、今後さらに重要になると考えられる。本研究でエアロゾルの台風への影響の理解が得られたため、今後、予測精度向上に向けて継続して研究することで、社会的意義のある成果へ繋がると期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • Research Products

    (16 results)

All 2020 2019 2018

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (11 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Book (1 results)

  • [Journal Article] Impacts of Number of Cloud Condensation Nuclei on Two-Dimensional Moist Rayleigh Convection2020

    • Author(s)
      MIYAMOTO Yoshiaki、NISHIZAWA Seiya、TOMITA Hirofumi
    • Journal Title

      Journal of the Meteorological Society of Japan. Ser. II

      Volume: 98 Issue: 2 Pages: 437-453

    • DOI

      10.2151/jmsj.2020-023

    • NAID

      130007840535

    • ISSN
      0026-1165, 2186-9057
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On the Correlation between Total Condensate and Moist Heating in Tropical Cyclones and Applications for Diagnosing Intensity2019

    • Author(s)
      Nolan David S.、Miyamoto Yoshiaki、Wu Shun-nan、Soden Brian J.
    • Journal Title

      Monthly Weather Review

      Volume: 147 Issue: 10 Pages: 3759-3784

    • DOI

      10.1175/mwr-d-19-0010.1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Large dependency of charge distribution in a tropical cyclone inner core upon aerosol number concentration2019

    • Author(s)
      Sato Yousuke、Miyamoto Yoshiaki、Tomita Hirofumi
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 6 Issue: 1

    • DOI

      10.1186/s40645-019-0309-7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones2018

    • Author(s)
      Miyamoto, Y., D. S. Nolan, and N. Sugimoto
    • Journal Title

      Journal of the Atmospheric Sciences

      Volume: 75 Issue: 11 Pages: 3965-3986

    • DOI

      10.1175/jas-d-18-0042.1

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 台風に関する最新の研究の紹介2019

    • Author(s)
      宮本佳明
    • Organizer
      気象予報士会神奈川支部例会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] A Dynamical Mechanism on Secondary Eyewall Formation of Tropical Cyclones2019

    • Author(s)
      Yoshiaki Miyamoto
    • Organizer
      Asia-Oceania Geoscience Society 2019 meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Structural Changes Preceding Rapid Intensification in Tropical Cyclones as shown in a Large Ensemble of Idealized Simulations2019

    • Author(s)
      Yoshiaki Miyamoto
    • Organizer
      Japan Geoscience Union 2019 meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] エクマンパンピング不安定2019

    • Author(s)
      宮本佳明
    • Organizer
      Japan Geoscience Union 2019 meeting
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] A Dynamical Mechanism on Secondary Eyewall Formation of Tropical Cyclones2019

    • Author(s)
      Yoshiaki Miyamoto
    • Organizer
      Typhoon Seminar 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dynamical Mechanism for Secondary Eyewall Formation in Tropical Cyclones2019

    • Author(s)
      Miyamoto, Y., D. S. Nolan, and N. Sugimoto
    • Organizer
      The 13th Conference on Mesoscale Convective Systems and High-Impact Weather in East Asia
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Linear Thermal Analysis of discretized fluid equations. Seminar of Rosenstiel School of Marine and Atmospheric Sciences2019

    • Author(s)
      Miyamoto, Y
    • Organizer
      Seminar of Rosenstiel School of Marine and Atmospheric Sciences
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 270メンバーのアンサンブル計算から得られた急発達前の台風の構造変化2019

    • Author(s)
      宮本佳明
    • Organizer
      低気圧と暴風雨に係るワークショップ 2019
    • Related Report
      2018 Annual Research Report
  • [Presentation] エクマンパンピングを介した不安定2018

    • Author(s)
      宮本佳明, D. S. Nolan, 杉本憲彦
    • Organizer
      日本気象学会2018年度秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 第二の眼の壁雲の形成メカニズム2018

    • Author(s)
      宮本佳明, D. S. Nolan, 杉本憲彦
    • Organizer
      日本気象学会2018年度秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 台風における風2018

    • Author(s)
      宮本佳明
    • Organizer
      第60回風に関するシンポジウム
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Book] 台風についてわかっていることいないこと2018

    • Author(s)
      筆保弘徳, 山田広幸, 宮本佳明, 伊藤耕介, 山口宗彦, 金田幸恵
    • Total Pages
      242
    • Publisher
      ベレ出版
    • ISBN
      4860645553
    • Related Report
      2018 Annual Research Report

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Published: 2018-08-27   Modified: 2024-03-26  

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