Global modelling of the lithosphere and mantle and explaning geoid signal by merging of tomography derived mantle flow models with full thermal convection models including lateral viscosity variations

通过将层析成像导出的地幔流模型与包括横向粘度变化的完整热对流模型相结合，对岩石圈和地幔进行全局建模并解释大地水准面信号

• 批准号: 30185318
• 负责人: Dr. Mikhail Kaban
• 金额: --
• 依托单位: Sektion 1.3: Erdsystem-Modellierung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30185318?language=en
• 关键词: Global; modelling; lithosphere; mantle; explaning

The Earth¿s gravity field and geoid are very sensitive to the density structure and dynamic processes within the Earth that strongly influence its surface. Globally complete and homogenous gravity and geoid models as well as their temporal variations are, being provided by the new satellite missions CHAMP and GRACE with unprecedented accuracy. These data offer a unique opportunity to better understand global Earth structure and dynamics, The new gravity data will be used with other data (seismic P-, S-velocities, surface topography, GPS-derived surface velocities, heat flow) to investigate global Earth structure, to quantitatively describe the underlying dynamic and thermal convection processes, and to model the associated response of the Earth¿s surface. These goals will be achieved by the construction of a global 3D model of the Earth that describes the main properties and dynamics of the mantle and crust. Because global processes strongly influence regional tectonic regimes, special attention will also be placed on cross-scale modelling of time-dependent processes on regional scales such as collision zones and the associated timedependent gravity signals. Thus this project will attempt to explain both the dominating long wavelength contributions of the static gravity field, the weak higher degree regional variations and the very weak temporal variations in terms of geodynamic processes.

地球重力场和大地水准面对地球内部的密度结构和动力学过程非常敏感，并对地球表面产生强烈的影响。新的卫星飞行任务CHAMP和GRACE以前所未有的准确度提供了全球完整和均匀的重力和大地水准面模型及其时间变化。这些数据提供了一个独特的机会，以更好地了解全球地球结构和动力学，新的重力数据将与其他数据（地震P-，S-速度，表面地形，GPS导出的表面速度，热流）一起使用，以研究全球地球结构，定量描述底层的动力学和热对流过程，并模拟地球表面的相关响应。这些目标将通过建立一个全球三维地球模型来实现，该模型描述了地幔和地壳的主要特性和动力学。由于全球过程对区域构造状况有很大影响，因此还将特别注意区域尺度上随时间变化的过程的跨尺度建模，如碰撞区和相关的随时间变化的重力信号。因此，本项目将试图从地球动力学过程的角度解释静态重力场的主要长波长贡献、较弱的高次区域变化和非常弱的时间变化。