Observational Constraints on Theories of the Geodynamo

PI将继续进行旨在进一步了解长期变化的运动学和动力学的调查，寻求对地球动力学理论提供有用的限制。这项工作主要基于对地核-地幔边界磁场时变模型的观测。具体注意的领域包括：1。岩心顶部流体流动模式的确定；2. 正演模拟技术，为观测到的磁场现象提供简单的解释，并检查地核和下地幔中特定物理过程的重要性；3. 短周期长期变化的研究，特别是在地核中寻找波状现象；4. 成分对流动力学的研究，以及在地核表面附近可能生长的稳定层。

The PI will continue investigations aimed at furthering understanding of the kinematics and dynamics of the secular variation, seeking to provide useful constraints on theories of the geodynamo. This work is largely based on the use of observations in the form of a time-varying model of the magnetic field at the core-mantle boundary. Specific areas of attention include: 1. the determination of the pattern of fluid flow at the top of the core; 2. forward modeling techniques to provide simple explanations of observed phenomena in the magnetic field, and to examine the importance of particular physical processes in the core and lower mantle; 3. investigation of the short-period secular variation and especially the search for wave-like phenomena in the core; 4. examination of the dynamics of compositional convection, and possible growth of a stable layer near the core surface.