Investigations of the Geodynamo

地球发电机的研究

• 批准号: 9725675
• 负责人: Jeremy Bloxham
• 金额: $ 20万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725675&HistoricalAwards=false
• 关键词: Investigations; Geodynamo

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. ***

小行星9725675 私家侦探建议继续调查的geodynamo，建立在他的三维，动态自洽发电机代码和进一步使用的意见，把发电机过程中的限制。 当前的地球发电机模型在与地球相同的动力学机制下运行，但在高阶时，由于不可避免的计算限制，模型对地球的缩放是不完美的。 除了解决这个问题，P.I.还计划对该模型进行一些开发，旨在进一步改进模型的计算方面，并包括额外的地球物理效应，特别是核幔边界横向不均匀性的影响。 还将开发用于研究长期磁场演变的参数化模型。 将利用观测结果，围绕地核与地球其余部分之间的角动量交换进行一些研究。 在这个领域，观测在制约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查的基本假设，通过分析地磁长期变化。 ***