Improved Holocene global geomagnetic field reconstructions based on sediment data

基于沉积物数据的改进全新世全球地磁场重建

• 批准号: 169031049
• 负责人: Dr. Monika Korte
• 金额: --
• 依托单位: Sektion 4.3: Klimadynamik und Landschaftsentwicklung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169031049?language=en
• 关键词: Improved; Holocene; global; geomagnetic; field

We propose to improve global geomagnetic field reconstructions spanning the past millennia by investigating the quality of Holocene paleomagnetic sediment records. Global field models are used both to study geodynamo processes in the Earth’s core and to take into account the shielding effect of the geomagnetic field in the interaction of galactic cosmic rays with our planet’s environment. The resolution and reliability of Holocene field models at present are limited for two reasons: firstly, the sparse southern hemisphere archeomagnetic data coverage, and secondly, large data and dating uncertainties particularly in sediment data. A re-evaluation of all compiled sediment records based on lithology and comparison to global models will improve the growing understanding of sediment data quality, possibly leading to correction methods and improved age models. We plan to compile a database containing relevant meta-data for all available sediment records (e.g. lithology, dating method) and then use this information to investigate the quality of the magnetic signal and age control in individual records. The objective is an improvement of Holocene field reconstructions as a prerequisite to investigate the evolution of our planet’s magnetic shield and its interaction with the planetary environment.

我们建议通过研究全新世古疗法记录的质量来改善跨越过去几千年的全球地磁田间重建。全球野外模型既用于研究地球核心中的地磁过程，又要考虑到银河宇宙射线与我们星球环境的相互作用中地磁领域的屏蔽效应。目前，全新世田间模型的分辨率和可靠性有两个原因：首先，南半球磁性数据覆盖范围稀疏，其次，大量数据和约会不确定性，尤其是在沉积物数据中。基于岩性和与全球模型比较的所有编译沉积物记录的重新评估将提高人们对沉积物数据质量的不断增长，可能导致校正方法和改善年龄模型。我们计划为所有可用的沉积物记录（例如岩性，约会方法）编译包含相关元数据的数据库，然后使用此信息来研究单个记录中磁信号和年龄控制的质量。目的是改善全新世场重建，是研究我们星球磁盾的演变及其与行星环境的相互作用的先决条件。