Multi time-scale modeling on geodynamics

2014 Fiscal Year Final Research Report

• Project/Area Number: 25800254
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Japan 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
• 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

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.

Free Research Field

地球惑星流体力学