Investigations of the Geodynamo

9725675私家侦探布洛克瑟姆提议继续调查地球发电机，建立在他的三维动态自洽发电机代码的基础上，并进一步利用观测对发电机过程施加限制。目前的地球发电机模型与地球处于领先阶的动力机制相同，但在更高阶的模型中，由于不可避免的计算限制，模型对地球的尺度是不完美的。除了解决这一问题外，P.I.还计划对该模型进行若干发展，旨在进一步改进该模型的计算方面，并纳入额外的地球物理效应，特别是核-地幔边界的横向不均匀效应。还将开发用于研究长期场演变的模型的参数版本。利用观测，将进行一些以地核和地球其他部分之间的角动量交换为中心的研究。在这一领域，观测在限制地球发电机方面发挥着特别重要的作用。最后，发电机模型将被用来检验在分析地磁长期变化时所采用的基本假设。***

9725675 Bloxham The P.I. proposes to continue investigations of the geodynamo, building on his 3-dimensional, dynamically self-consistent dynamo code and furthering use of observations to place constraints on the dynamo process. The current geodynamo model operates in the same dynamical regime as the Earth at leading order, but at higher order the scaling of the model to the Earth is imperfect because of unavoidable computational constraints. In addition to tackling this problem, the P.I. also plans a number of developments of the model aimed both at further improvements to the computational aspects of the model and at including additional geophysical effects, especially the effects of lateral heterogeneity at the core-mantle boundary. A parameterized version of the model for studying long-term field evolution will also be developed. Using observations, a number of studies centered on the exchange of angular momentum between the core and the rest of the Earth will be undertaken. This is an area where observations have a particularly important role to play in constraining the geodynamo. Finally, the dynamo model will be used to examine the underlying assumptions that are adopted in analyzing the geomagnetic secular variation. ***