Late quaternary high frequency geomagnetic field dynamics

这项研究计划的长期目标是双重的：科学和方法。在科学一级，长期目标是重建第四纪晚期期间地球磁场方向和强度的百年至千年变化，以便确定地球磁场的高频动力学，特别强调突变。最近从加拿大东部和加拿大北极西部恢复了几个高分辨率(&gt；1米/卡)沉积岩芯，并计划从西北航道和加拿大北极东部恢复沉积岩芯，这将使首次大规模研究北极的地磁场动力学，并确定地磁场突变的空间范围。另一个长期的科学目标是确定地球磁场形态对宇宙成因同位素产生率的影响。在方法学层面，长期目标是开发加拿大东部和北极的古地磁区域主曲线(倾角、偏角和古强度)，从而能够对晚第四纪陆地、湖泊、海洋和可能的冰芯记录进行测年和同步。此外，由于为古地磁目的测量的沉积物的磁性取决于磁性颗粒的矿物学、颗粒大小和浓度，我还设想结合磁性和物理性质数据开发一种快速、无损和高分辨率的原始方法，以识别与加拿大东部和北极古气候或环境变化有关的岩性变化。

The long-term objectives of this research program are twofold: scientific and methodological. At the scientific level, the long-term goal is to reconstruct centennial to millennial changes in Earth's magnetic field direction and intensity during the Late Quaternary in order to determine the high frequency dynamics of the geomagnetic field with a special emphasis on abrupt changes. The recent recovery of several high resolution (>1 m/ka) sediment cores from Eastern Canada and the Western Canadian Arctic along with the planned recovery of sediment cores from the Northwest Passage and Eastern Canadian Arctic will allow the first large-scale study of geomagnetic field dynamics in the Arctic, as well as the determination of the spatial extent of abrupt geomagnetic field changes. Another long-term scientific goal is to determine the influence of Earth's magnetic field morphology on the production rate of cosmogenic isotopes. At the methodological level, the long-term goal is to develop paleomagnetic regional master curves (inclination, declination and paleointensity) for Eastern and Arctic Canada, allowing the dating and synchronization of Late Quaternary terrestrial, lacustrine, marine and possibly ice core records. In addition, because the magnetic properties of the sediments measured for paleomagnetic purposes depend on the mineralogy, grain size and concentration of the magnetic grains, I also envision combining magnetic and physical property data to develop a rapid, non-destructive and high resolution original method to identify lithological variations associated with paleoclimatic or environmental changes in Eastern and Arctic Canada.