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Development of a new numerical simulation model of an integrated system for the convecting mantle and outer-core

Research Project

Project/Area Number 26610144
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Solid earth and planetary physics
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

Yoshida Masaki  国立研究開発法人海洋研究開発機構, 地球深部ダイナミクス研究分野, 主任研究員 (00371716)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsマントル / コア / 外核 / 熱対流 / 二層対流 / 数値シミュレーション / 粘性率 / 熱膨張係数
Outline of Final Research Achievements

A series of high-resolution numerical simulations of Rayleigh-Bénard convection with a highly viscous outer layer (HVL) and a low-viscosity inner layer (LVL) in 2-D spherical-shell geometry were performed to investigate the dynamics of convection between two layers with large viscosity contrasts up to 10**3. Results show that the mechanical coupling (MC) mode is dominant in two-layer convection when the viscosity contrast between the two layers is sufficiently small, and it weakens, becoming closer to the thermal coupling (TC) mode, as the LVL viscosity decreases. This transition from MC to TC modes results in a stabilizing of the convection speed and the heat transport efficiency of the HVL. Our numerical results imply that thermal convection in the mantle controls the heat transport efficiency of the two-layer solid-earth system and controls the convective style in the outer core.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Products Report
  • Research Products

    (27 results)

All 2017 2016 2015 2014 Other

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 3 results,  Acknowledgement Compliant: 2 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results) Book (2 results) Remarks (4 results)

  • [Journal Article] A simple 3D numerical model of thermal convection in Earth's growing inner core: On the possibility of the formation of the degree-one structure with lateral viscosity variations2016

    • Author(s)
      Masaki Yoshida
    • Journal Title

      Solid Earth

      Volume: 未定

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Numerical studies on the dynamics of two-layer Rayleigh-Bénard convection with an infinite Prandtl number and large viscosity contrasts2016

    • Author(s)
      Masaki Yoshida and Yozo Hamano
    • Journal Title

      Physics of Fluids

      Volume: 28 Issue: 11 Pages: 116601-116601

    • DOI

      10.1063/1.4966685

    • Related Report
      Products Report
    • Peer Reviewed
  • [Journal Article] Driving forces of plate motion and continental drift: Revisited2015

    • Author(s)
      Claudia Adam, Scott D. King, Valerie Vidal, Michel Rabinowicz, Andre Jalobeanu, Masaki Yoshida
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 121 Issue: 12 Pages: 429-445

    • DOI

      10.5575/geosoc.2015.0031

    • NAID

      130005137430

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2015-12-15
    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 大陸とプレートを動かす力とは何か──大陸移動説“完成”から100年目で分かっていること2015

    • Author(s)
      吉田 晶樹
    • Journal Title

      科学

      Volume: 85 Pages: 692-704

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Pangea breakup and northward drift of the Indian subcontinent reproduced by a numerical model of mantle convection2015

    • Author(s)
      Masaki Yoshida and Yozo Hamano
    • Journal Title

      Scientific Reports

      Volume: 5 Issue: 1 Pages: 8407-8407

    • DOI

      10.1038/srep08407

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Geodynamic modeling of the South Pacific superswell2014

    • Author(s)
      Claudia Adam, Masaki Yoshida, Daisuke Suetsugu, Yoshio Fukao, and Cecilia Cadio
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 229 Pages: 24-39

    • DOI

      10.1016/j.pepi.2013.12.014

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of various lithospheric yield stress and different mantle-heating mode in the breakup of the Pangea supercontinent2014

    • Author(s)
      Masaki Yoshida
    • Journal Title

      Geophysical Research Letters

      Volume: (in press) Issue: 9 Pages: 3060-3067

    • DOI

      10.1002/2014gl060023

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Journal Article] A new conceptual model for whole mantle convection and the origin of hotspot plumes2014

    • Author(s)
      Masaki Yoshida
    • Journal Title

      Journal of Geodynamics

      Volume: 78 Pages: 32-41

    • DOI

      10.1016/j.jog.2014.04.004

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Presentation] Recent advances in the 3-D numerical simulation of the Earth's mantle convection2016

    • Author(s)
      Masaki Yoshida
    • Organizer
      Geoscience Frontiers Annual Convention & Editorial Board Meeting
    • Place of Presentation
      China University of Geosciences at Beijing, Beijing, China
    • Year and Date
      2016-10-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Subduction factory and its impact on global mantle heterogeneity2016

    • Author(s)
      Hikaru Iwamori, Akihiko Ikemoto, Hitomi Nakamura, Masaki Yoshida, and Ryunosuke Yanagi
    • Organizer
      The 26th Goldschmidt Conference
    • Place of Presentation
      Pacifico Yokohama, Yokohama, Kanagawa
    • Year and Date
      2016-06-29
    • Related Report
      2015 Annual Research Report
  • [Presentation] Three-dimensional mantle convection and material cycling with continental dispersal and coalescence2016

    • Author(s)
      Ryunosuke Yanagi and Masaki Yoshida
    • Organizer
      日本地球惑星科学連合2016年大会
    • Place of Presentation
      幕張メッセ国際会議場, 千葉県千葉市
    • Year and Date
      2016-05-23
    • Related Report
      2015 Annual Research Report
  • [Presentation] マントル組成の東西半球構造と全地球ダイナミクス2015

    • Author(s)
      岩森 光, 中村 仁美, 吉田 晶樹, 柳 竜之介
    • Organizer
      2015年度日本地球化学会第62回年会
    • Place of Presentation
      横浜国立大学, 神奈川県横浜市
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] 大陸移動の原動力と大陸内応力場の起源2015

    • Author(s)
      吉田 晶樹
    • Organizer
      日本地質学会第122年学術大会
    • Place of Presentation
      信州大学, 長野県長野市
    • Year and Date
      2015-09-11
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] East-west mantle geochemical hemispheres and its implications for a coupled supercontinent-mantle-core dynamics2015

    • Author(s)
      Hikaru Iwamori, Hitomi Nakamura, and Masaki Yoshida
    • Organizer
      26th General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    • Place of Presentation
      Prague Congress Centre, Prague, Czech Republic
    • Year and Date
      2015-06-28
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 大陸移動と沈み込み帯2015

    • Author(s)
      吉田 晶樹
    • Organizer
      地震研究所共同利用研究集会:「沈み込み帯」
    • Place of Presentation
      東京大学地震研究所, 東京都文京区
    • Year and Date
      2015-05-30
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] 地球内部の東西半球構造とグローバルダイナミクス2015

    • Author(s)
      岩森 光, 中村 仁美, 吉田 晶樹, 田中 聡, 中川 貴司, 中久喜 伴益
    • Organizer
      日本地球惑星科学連合2015年大会
    • Place of Presentation
      幕張メッセ国際会議場, 千葉県千葉市
    • Year and Date
      2015-05-26
    • Related Report
      2015 Annual Research Report
  • [Presentation] On the driving forces of the Pangea breakup and northward drift of the Indian subcontinent2015

    • Author(s)
      Masaki Yoshida and Yozo Hamano
    • Organizer
      European Geosciences Union General Assembly 2015
    • Place of Presentation
      Austria Center Vienna, Wien, Austria
    • Year and Date
      2015-04-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Seafloor subsidence, effective thermal conductivity, and mantle dynamics2014

    • Author(s)
      Claudia Adam, Scott D. King, Michel Rabinowicz, Valérie Vidal, André Jalobeanu, and Masaki Yoshida
    • Organizer
      AGU 2014 Fall Meeting
    • Place of Presentation
      Moscone Convention Center, San Francisco, USA
    • Year and Date
      2014-12-17
    • Related Report
      2014 Research-status Report
  • [Presentation] 地球の内部で起こっているマントル対流の数値シミュレーション2014

    • Author(s)
      吉田 晶樹
    • Organizer
      日本学術会議 第4回計算力学シンポジウム
    • Place of Presentation
      日本学術会議講堂(東京都港区)
    • Year and Date
      2014-12-01
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] 計算機シミュレーションで再現されたマントル対流の可視化の問題点2014

    • Author(s)
      吉田 晶樹
    • Organizer
      第64回CG・可視化研究会(CAVE研究会)
    • Place of Presentation
      海洋研究開発機構横浜研究所(神奈川県横浜市)
    • Year and Date
      2014-08-22
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] Subduction processes and a new hypothesis for “top-down hemispherical dynamics” of the Earth2014

    • Author(s)
      Hikaru Iwamori, Hitomi Nakamura, Takeshi Hanyu, Jun-ichi Kimura, Tomoeki Nakakuki, Takashi Nakagawa, Masaki Yoshida, Satoru Tanaka, Daisuke Suetsugu, Masayuki Obayashi
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜(神奈川県横浜市)
    • Year and Date
      2014-04-28
    • Related Report
      2014 Research-status Report
  • [Book] 図説 固体地球の事典2017

    • Author(s)
      鳥海光弘 編集代表(「超大陸の形成とウィルソンサイクル」の章を分担執筆)
    • Publisher
      朝倉書店
    • Related Report
      2015 Annual Research Report
  • [Book] 地球はどうしてできたのか―マントル対流と超大陸の謎2014

    • Author(s)
      吉田 晶樹
    • Total Pages
      268
    • Publisher
      講談社
    • Related Report
      2014 Research-status Report
  • [Remarks] 吉田晶樹ウェブページ

    • URL

      http://yoshida-geophys.jp/

    • Related Report
      2015 Annual Research Report 2014 Research-status Report
  • [Remarks] ウェゲナー「大陸移動説」完成100年に寄せて

    • URL

      http://www.jamstec.go.jp/j/jamstec_news/20150914/

    • Related Report
      2015 Annual Research Report
  • [Remarks] 話題の研究 謎解き解説「シミュレーションで大陸移動の再現に成功!」編

    • URL

      http://www.jamstec.go.jp/j/about/press_release/quest/20150212/

    • Related Report
      2015 Annual Research Report
  • [Remarks] 「ちきゅう」10年の軌跡

    • URL

      https://youtu.be/P3xRgGvuxyU

    • Related Report
      2015 Annual Research Report

URL: 

Published: 2014-04-04   Modified: 2018-03-20  

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