Mass motion in the Earth's core and mantle and their influence on polar motion

地核和地幔的质量运动及其对极移的影响

• 批准号: 5456195
• 负责人: Dr.-Ing. Jan Hagedoorn
• 金额: --
• 依托单位: Universitätsbibliothek
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5456195?language=en
• 关键词: Mass; motion; Earth; core; mantle

Mass motion is the Earth¿s interior cause variations of polar motion and the gravity field. In this project, geophysical phenomena connected with the Earth core and mantle will be investigated, in particular for the decadal and subdecadal time scale ¿ a scale range, which is important for the objectives of the DFG Research Unit. The objectives of this project are (i) an improved modeling of core-mantle coupling and inner-core motions, to better understand the applied geophysical processes and to solve the present discrepancies between predicted and observed values of polar-motion variations, and (ii) to check whether the density variations and/or mass redistributions accompanying these processes are large enough to be detectable in the gravity field. A uniform model of various coupling mechanisms requires a uniform model of the coremantle transition zone. Existing models of this zone and the processes in the overlying mantle should be extended to output the polar motion and gravity quantities associated with resulting mass and density distributions and to determine their long-term changes.

质量运动是地球内部极移和重力场变化的原因。在这个项目中，将研究与地核和地幔有关的地球物理现象，特别是十年和亚十年时间尺度，这对DFG研究股的目标很重要。该项目的目标是（i）改进核幔耦合和内核运动的建模，以更好地理解应用的地球物理过程，并解决目前极移变化的预测值和观测值之间的差异，以及（ii）检查伴随这些过程的密度变化和/或质量重新分布是否足够大，可以在重力场中检测到。各种耦合机制的统一模型需要核幔过渡带的统一模型。现有的模型，这一地区和上覆地幔的过程应扩大输出的极地运动和重力量与由此产生的质量和密度分布，并确定其长期变化。

项目成果

Core-mantle coupling: Part II: Topographic coupling torques

核幔耦合：第二部分：地形耦合扭矩

• DOI: 10.2312/gfz.b103-08113
• 发表时间: 2008
• 作者: Greiner-Mai;Hagedoorn
• 通讯作者: Hagedoorn

Core-mantle coupling: Part I: Electromagnetic coupling torques

• DOI: 10.2312/gfz.b103-08061
• 发表时间: 2008
• 作者: J. Hagedoorn;H. Greiner-Mai

Core-Mantle coupling : Part III: gravitational coupling torques

核幔耦合：第三部分：重力耦合扭矩

• DOI: 10.2312/gfz.b103-12019
• 发表时间: 2012
• 作者: Hagedoorn;Geiner-Mai;Ballani
• 通讯作者: Ballani