Analysis of Geodynamo Simulations and Comparison with Paleomagnetic Data

地球发电机模拟分析及与古地磁数据的比较

• 批准号: 9903194
• 负责人: Robert Coe
• 金额: $ 12万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903194&HistoricalAwards=false
• 关键词: Analysis; Geodynamo; Simulations; Comparison; Paleomagnetic

9903194 Coe Dynamo modeling has advanced to the stage that meaningful comparisons between simulated behavior of the geomagnetic field and observational data can now be made. The Glatzmaier-Roberts 3-D, dynamically self-consistent supercomputer computations employ both thermal and compositional convection in the core driven by various prescribed patterns of heat flux at the core-mantle boundary. They have now yielded simulations of the geomagnetic field totaling about one and a half million model years that exhibit dipole-dominated, stable polarity intervals punctuated by excursions and reversals. The investigators propose to analyze these geodynamo simulations in order to compare them with paleomagnetically observed field behavior, both time-averaged field data and records of directional excursions and polarity reversals. These comparisons will lead both to improved dynamo models and to a better understanding of processes and conditions in the core and deep mantle that are important in generating the Earth's field.

9903194 Coe Dynamo模型已经发展到可以对地磁场的模拟行为和观测数据进行有意义的比较的阶段。Glatzmaier-Roberts 3-D动态自洽超级计算机计算采用了由核幔边界处各种规定的热通量模式驱动的核中的热对流和成分对流。他们现在已经产生了大约150万个模型年的地磁场模拟结果，这些模拟结果显示出偶极占主导地位的稳定极性间隔，并不时出现偏移和反转。研究人员建议分析这些地球发电机模拟，以便将它们与古地磁观测到的场行为进行比较，包括时间平均场数据以及方向偏移和极性反转的记录。这些比较将有助于改进发电机模型，并更好地了解地核和地幔深处的过程和条件，这些过程和条件对产生地球磁场至关重要。