POWRE: Building a Research Program in Geomagnetism and Paleomagnetism

9973602约翰逊该POWRE奖支持对地磁学和古地磁学的重点研究，这将构成这些领域综合研究计划的一部分。拟议的活动包括汇编和模拟与过去5个月全球地磁场行为有关的古地磁数据集。虽然0-5Myr地磁场的总体性质已经知道了一段时间，但偏离这些一阶特征--实场行为与数据集或建模技术的限制--的意义仍然难以捉摸。然而，反映在时间平均结构、时间或长期变化以及反转中的场行为的细节是重要的，因为它们可能与地球核幔边界(CMB)的条件密切相关。越来越多的地震学证据表明，在广泛的空间尺度上，CMB附近的下地幔物理性质存在着强烈的横向变化。最近的地球发电机模拟表明，这种非均质性可能会对外核的动力学以及地球表面的地磁观测值产生深远的影响。这项研究将侧重于吸引本科生，而不是研究生，以便建立一个研究项目，该项目可以作为主要本科院校的教员继续下去，并在短期内加强斯克里普斯海洋研究所的研究和研究生项目与加州大学圣迭戈分校本科地球科学项目之间的联系。在大量缺席全日制学术研究后，这一奖项将为PI提供关键资金。

9973602JohnsonThis POWRE award supports a focussed study in geomagnetism and paleomagnetism, which will constitute part of an integrated research program in these fields. The proposed activities comprise the compilation and modeling of paleomagnetic data sets pertaining to global geomagnetic field behavior over the past 5 Myr. While the gross properties of the 0-5 Myr geomagnetic field have been known for some time, the significance of departures from these first order characteristics- real field behavior versus limitations of data sets or modeling techniques- has remained elusive. However, the details of field behavior reflected in the time-averaged structure, temporal or secular variations, and reversals are important as they may be intimately related to conditions at Earth's core-mantle boundary (CMB). There is increased seismological evidence that strong lateral variations in the physical properties of the lower mantle near the CMB exist over a wide range of spatial scales. Recent geodynamo simulations indicate that such heterogeneities may have profound influences on the dynamics of the outer core, and on geomagnetic observables at the Earth's surface. The research will focus on involving undergraduate students, rather than graduate students in order to build a research program which could be continued as a faculty member at a primarily undergraduate institution, and in the short-term to strengthen ties between the research and graduate programs at Scripps Institution of Oceanography and the UCSD undergraduate Earth science program. This award would provide critical funding for the PI, after a significant absence from full-time academic research.