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Multi time-scale modeling on geodynamics

Research Project

Project/Area Number 25800254
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

NAKAGAWA Takashi  独立行政法人海洋研究開発機構, 数理科学・先端技術研究分野, 主任研究員 (50396941)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsマントルダイナミクス / コアダイナミクス / 熱化学進化 / 安定成層 / コアーマントル熱進化 / 地球熱化学進化 / コア-マントル熱流量 / 不均質構造 / 初期地球仮説
Outline of Final Research Achievements

We attempt to reveal both long-term and short-term dynamics of Earth's deep interior, which are based on mantle convection simulation as the long-term and geodynamo simulations as the short-term. On the long-term evolution, the primordial material generated from early Earth differentiation would be important for reconciling core-mantle evolution such as the size of inner core and magnetic field generation over the geologic time-scale. With suggestions from long-term evolution that the stably stratified region at the top of outer core,we hereby focus on the origin of such a region at the top of outermost core with O(100) to 1000 km thickness. As a result, the origin of such a region might be a compositional interaction between metallic iron of core material and silicate material of mantle rock at the core-mantle boundary, which was strongly suggested from numerical geodynamo simulations.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (14 results)

All 2015 2014 2013 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Acknowledgement Compliant: 1 results) Presentation (11 results) (of which Invited: 4 results)

  • [Journal Article] An implication for the origin of stratification below the core-mantle boundary in numerical dynamo simulatiions in a rotating spherical shell2015

    • Author(s)
      Nakagawa, T.
    • Journal Title

      Physics of Earth and Planetary Interior

      Volume: 印刷中 Pages: 94-104

    • DOI

      10.1016/j.pepi.2015.02.007

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Influence of combined primordial layering and recycled MORB on the coupled thermal evolution of Earth's mantle and core2014

    • Author(s)
      Nakagawa, T., and P. J. Tackley
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 15 Issue: 3 Pages: 619-633

    • DOI

      10.1002/2013gc005128

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Implicatios of high core thermal conductivity on Earth's coupled mantle and core evolution2013

    • Author(s)
      Nakagawa, T., and P. J. Tackley
    • Journal Title

      Geophysical Research Letters

      Volume: 40 Issue: 11 Pages: 1-5

    • DOI

      10.1002/grl.50574

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] On a coupled evolution of Earth's mantle and core: Implications for magnetic evolution over the geologic time-scale2015

    • Author(s)
      Nakagawa, T.
    • Organizer
      EGU 2015 General Assembly
    • Place of Presentation
      Vienna, Austria
    • Year and Date
      2015-04-14
    • Related Report
      2014 Annual Research Report
  • [Presentation] On the compositional stratification below the core-mantle boundary in geodynamo simulations2015

    • Author(s)
      Nakagawa, T.
    • Organizer
      EGU 2015 General Assembly
    • Place of Presentation
      Vienna, Austria
    • Year and Date
      2015-04-14
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effect of Hydrous Mantle on a Coupled Core-Mantle Evolution2014

    • Author(s)
      Nakagawa, T., and H. Iwamori
    • Organizer
      American Geophysical Union 2014 Fall Meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      2014-12-16
    • Related Report
      2014 Annual Research Report
  • [Presentation] コアーマントル結合モデルによる磁場進化史2014

    • Author(s)
      中川貴司
    • Organizer
      地球電磁気・地球惑星圏学会第136回総会および講演会
    • Place of Presentation
      キッセイ文化ホール(長野県松本文化会館)
    • Year and Date
      2014-10-31
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effects of thermal conductivity on thermal and magnetic evolution of Earth's core

    • Author(s)
      Nakagawa, T.
    • Organizer
      日本地球惑星科学連合2013年大会
    • Place of Presentation
      幕張メッセ(千葉県)
    • Related Report
      2013 Research-status Report
  • [Presentation] A coupled thermo-chemical evolution of Earth's mantle and core: Effects of a three-component mantle dynamics

    • Author(s)
      Nakagawa, T., and P. J. Tackley
    • Organizer
      International workshop for modeling on mantle and lithospheric dynamics
    • Place of Presentation
      Klaekken Hotel, Hoenefoss, Norway
    • Related Report
      2013 Research-status Report
  • [Presentation] Implications for Earth's core dynamics with a stably stratified region below the CMB

    • Author(s)
      Nakagawa, T., and J. Aubert
    • Organizer
      Workshop on Transport properties in Earth's core
    • Place of Presentation
      若草の宿丸栄、富士河口湖町(山梨県)
    • Related Report
      2013 Research-status Report
    • Invited
  • [Presentation] Influence of magmatism on mantle cooling, surface heat flow and Urey ratio

    • Author(s)
      Nakagawa, T.
    • Organizer
      Workshop on Particle Geophysics
    • Place of Presentation
      東北大学(宮城県)
    • Related Report
      2013 Research-status Report
    • Invited
  • [Presentation] Implications of high thermal conductivity on Earth's coupled mantle and core evolution and dynamics of Earth's core

    • Author(s)
      Nakagawa, T.
    • Organizer
      American Geophysical Union 2013 Fall Meeting
    • Place of Presentation
      Moscone Convention Center, San Francisco, USA
    • Related Report
      2013 Research-status Report
    • Invited
  • [Presentation] Dynamical behavior caused by numerical dynamo simulations in a rotating spherical shell with the heterogeneous outer boundary

    • Author(s)
      Nakagawa, T., and J. Aubert
    • Organizer
      American Geophysical Union 2013 Fall Meeting
    • Place of Presentation
      Moscone Convention Center, San Francisco, USA
    • Related Report
      2013 Research-status Report
  • [Presentation] 素粒子で拓く地球ダイナミクス

    • Author(s)
      中川貴司
    • Organizer
      日本物理学会2014年春季大会
    • Place of Presentation
      東海大学(神奈川県)
    • Related Report
      2013 Research-status Report
    • Invited

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Published: 2014-07-25   Modified: 2019-07-29  

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