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A study on vortex-type low pressure systems around the Meghalaya, Bangladesh and Myanmar region

Research Project

Project/Area Number 26400465
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionNagoya University

Principal Investigator

FUJINAMI HATSUKI  名古屋大学, 宇宙地球環境研究所, 講師 (60402559)

Co-Investigator(Renkei-kenkyūsha) YASUNARI TETSUZO  総合地球環境学研究所, 所長 (80115956)
TSUBOKI KAZUHISA  名古屋大学, 宇宙地球環境研究所, 教授 (90222140)
HIROSE MASAFUMI  名城大学, 理工学部, 准教授 (40392807)
Research Collaborator HATSUZUKA DAISUKE  名古屋大学, 環境学研究科, 大学院生
KATO MASAYA  名古屋大学, 宇宙地球環境研究所, 研究員 (00648272)
KANAMORI HIRONARI  名古屋大学, 宇宙地球環境研究所, 研究員 (50422803)
HIRATA HIDETAKA  名古屋大学, 宇宙地球環境研究所, 研究員 (30808499)
Project Period (FY) 2014-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords渦状低気圧 / モンスーン / バングラデシュ / メガラヤ高原 / ミャンマー / 降水 / 季節内振動 / 日変化 / 低気圧 / 降水システム / 雲解像モデル / アジアモンスーン / 季節内変動 / 降水量 / インド
Outline of Final Research Achievements

Vortex-type low pressure systems (LPSs) often appear around Bangladesh and cause heavy rainfall during boreal summer. This study examined the three dimensional structure of the LPSs including precipitation systems and atmospheric environment for the genesis and development of the LPSs. They have horizontal scale of about 600 km and vertical scale of about 9 km. The thermal structure shows clearly a cold core in the lower troposphere and a warm core in the upper levels. There are spiral rainbands with tall cumulus convections in the LPSs in the early stage of the development. Precipitation varies on 10-20 day period around Bangladesh. About 60% of active peaks of rainfall are related to the LPSs. Strong cyclonic shear in the lower troposphere and weak vertical wind shear throughout the troposphere, which fluctuate on intraseasonal timescales, help to induce the genesis of vortex-type LPSs. Latent heating due to condensation causes the rapid development of the LPSs.

Report

(5 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (18 results)

All 2017 2016 2015 2014 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results,  Acknowledgement Compliant: 2 results) Presentation (12 results) (of which Int'l Joint Research: 4 results) Remarks (3 results)

  • [Journal Article] Effects of the South Asian monsoon intraseasonal modes on genesis of low pressure systems over Bangladesh2017

    • Author(s)
      Hatsuzuka, D. and Fujinami, H.
    • Journal Title

      Journal of Climate

      Volume: 30 Issue: 7 Pages: 2481-2499

    • DOI

      10.1175/jcli-d-16-0360.1

    • Related Report
      2017 Annual Research Report 2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Contrasting Features of Monsoon Precipitation Around the Meghalaya Plateau Under Westerly and Easterly Regimes2017

    • Author(s)
      Fujinami Hatsuki、Sato Tomonori、Kanamori Hironari、Murata Fumie
    • Journal Title

      Journal of Geophysical Research: Atmospheres

      Volume: 122 Issue: 18 Pages: 9591-9610

    • DOI

      10.1002/2016jd026116

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characteristics of low pressure systems associated with intraseasonal oscillation of rainfall over Bangladesh during boreal summer2014

    • Author(s)
      Hatsuzuka, D., T. Yasunari and H. Fujinami
    • Journal Title

      Monthly Weather Review

      Volume: 142 Issue: 12 Pages: 4758-4774

    • DOI

      10.1175/mwr-d-13-00307.1

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Contrasting features of monsoon precipitation around the Meghalaya Plateau in westerly and easterly regimes2017

    • Author(s)
      Hatsuki Fujinami, Tomonori Sato, Hironari Kanamori and Fumie Murata
    • Organizer
      International workshop for climate variability and related studies over North East Indian subcontinent
    • Place of Presentation
      名古屋
    • Year and Date
      2017-02-22
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2016年8月中旬に発生したモスーン低気圧の発達要因2017

    • Author(s)
      平田英隆・藤波初木・加藤雅也・坪木和久
    • Organizer
      日本気象学会2017年秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Contrasting features of monsoon precipitation around the Meghalaya Plateau in westerly and easterly regimes2017

    • Author(s)
      Fujinami, H., T. Sato, H. Kanamori and F. Murata
    • Organizer
      Sixth International Workshop on Monsoons (IWM-6)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Contrasting features of monsoon precipitation around the Meghalaya Plateau in westerly and easterly regimes from a 17-year TRMM observation2016

    • Author(s)
      Hatsuki Fujinami, Tomonori Sato, Hironari Kanamori and Fumie Murata
    • Organizer
      American Geophysical Union (AGU) Fall Meeting
    • Place of Presentation
      San Francisco
    • Year and Date
      2016-12-12
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Contrasting Features of Summer Monsoon Precipitation around the Meghalaya Plateau in Westerly and Easterly Regimes from a 17-year TRMM Observation2016

    • Author(s)
      Hatsuki Fujinami
    • Organizer
      The International Science Conference on MAHASRI
    • Place of Presentation
      Tokyo Metropolitan University, Japan
    • Year and Date
      2016-03-02
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Contrasting Features of Summer Monsoon Precipitation around the Meghalaya Plateau in Westerly and Easterly Regimes from a 17-year TRMM Observation2016

    • Author(s)
      Hatsuki Fujinami and Hironari Kanamori
    • Organizer
      International workshop on "Estimation and Prediction of Asian Monsoon Rainfall"
    • Place of Presentation
      Kyoto University, Japan
    • Year and Date
      2016-01-15
    • Related Report
      2015 Research-status Report
  • [Presentation] バングラデシュにおける渦状低気圧の発生と2つの季節内振動モードの関係2015

    • Author(s)
      初塚大輔・藤波初木
    • Organizer
      2015年日本気象学会秋季全国大会
    • Place of Presentation
      京都テルサ, 京都
    • Year and Date
      2015-10-28
    • Related Report
      2015 Research-status Report
  • [Presentation] バングラデシュ周辺の夏季降水量変動-日変化から長期トレンドまで-2015

    • Author(s)
      藤波初木
    • Organizer
      南アジア降水研究会
    • Place of Presentation
      高知大学
    • Year and Date
      2015-07-09
    • Related Report
      2015 Research-status Report
  • [Presentation] Dynamics of quasi-biweekly oscillation in rainfall over South Asia2015

    • Author(s)
      Fujinami, H. D. Hatsuzuka and T.Yasunari
    • Organizer
      Asian monsoon Hydroclimate -Review of MAHASRI and Beyond-
    • Place of Presentation
      名古屋
    • Year and Date
      2015-03-05
    • Related Report
      2014 Research-status Report
  • [Presentation] Characteristics of low-pressure systems associated with intraseasonal oscillation of rainfall over Bangladesh during boreal summer2014

    • Author(s)
      Hatsuzuka, D., H. Fujinami and T. Yasunari
    • Organizer
      American Geophysical Union Fall Meeting
    • Place of Presentation
      San Francisco, CA, USA
    • Year and Date
      2014-12-18
    • Related Report
      2014 Research-status Report
  • [Presentation] Dynamics of Distinct Intraseasonal Oscillation in Summer MonsoonRainfall over the Meghalaya-Bangladesh-western Myanmar Region2014

    • Author(s)
      Fujinami, H., T. Yasunari and D. Hatsuzuka
    • Organizer
      Takio Murakami memorial symposium on tropical meteorology and monsoon
    • Place of Presentation
      Honolulu, Hawaii, USA
    • Year and Date
      2014-07-02
    • Related Report
      2014 Research-status Report
  • [Presentation] 夏季南アジアの多雨地域に卓越する準二週間周期変動2014

    • Author(s)
      藤波初木・安成哲三
    • Organizer
      日本気象学会2014年度春季大会
    • Place of Presentation
      横浜
    • Year and Date
      2014-05-21
    • Related Report
      2014 Research-status Report
  • [Remarks]

    • URL

      http://mausam.hyarc.nagoya-u.ac.jp/~hatsuki/index.htm

    • Related Report
      2017 Annual Research Report
  • [Remarks]

    • URL

      http://mausam.hyarc.nagoya-u.ac.jp/~hatsuki/

    • Related Report
      2016 Research-status Report
  • [Remarks]

    • URL

      http://mausam.hyarc.nagoya-u.ac.jp/~hatsuki/

    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2019-03-29  

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