Late quaternary high frequency geomagnetic field dynamics

这个研究项目的长期目标是双重的：科学的和方法论的。在科学层面，长期目标是重建晚第四纪地球磁场方向和强度的百年至千年变化，以确定地磁场的高频动力学，特别强调突变。最近从加拿大东部和加拿大西部北极地区恢复的几个高分辨率（bbb10 m/ka）沉积物岩心，以及从西北航道和加拿大东部北极地区计划恢复的沉积物岩心，将使对北极地磁场动力学的第一次大规模研究以及确定地磁场突变的空间范围成为可能。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速率的影响。在方法层面上，长期目标是建立加拿大东部和北极地区的古地磁区域主曲线（倾角、赤纬和古强度），从而实现晚第四纪陆地、湖泊、海洋和可能的冰芯记录的测年和同步。此外，由于为古地磁目的而测量的沉积物的磁性取决于矿物学、粒度和磁性颗粒的浓度，我还设想将磁性和物理性质数据结合起来，开发一种快速、非破坏性和高分辨率的原始方法，以识别与加拿大东部和北极地区古气候或环境变化相关的岩性变化。

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.