Analysis of Geodynamo Simulations and Comparison with Paleomagnetic Data

9903194 Coe Dynamo模型已经发展到可以对模拟地磁场的行为和观测数据进行有意义的比较的阶段。Glatzmaier-Roberts 3-D动态自一致超级计算机计算采用了在地核-地幔边界由各种规定的热通量模式驱动的热对流和成分对流。他们现在已经模拟出了总共约150万年的地磁场，显示出偶极子主导，稳定的极性间隔被偏移和反转打断。研究人员建议分析这些地球动力学模拟，以便将它们与古地磁观测到的磁场行为进行比较，包括时间平均磁场数据和定向偏移和极性逆转的记录。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很重要。

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.