Reconstruction of geomagnetic paleointensity over the past 350,000 years based on Beryllium-10 records from two high accumulation sites in the Atlantic Ocean

过去35万年的地磁古强度记录将基于两个高度聚集的海洋沉积物岩心的高分辨率10be记录：ODP Leg 172， Site 1063和ODP Leg 177， Site 1089。为了从沉积记录中提取全球10be产量，采用了一种特殊的输运校正程序。该过程包括校正沉积物再分布的钍归一化方法和量化海洋中Th和10Be的横向输送的海洋模型计算。利用众所周知的相对地磁偶极子场强与10Be产率之间的关系来重建过去35万年的地磁古强度。这为重建地球磁场强度提供了一个完全独立的工具，可以作为传统古地磁方法的补充。利用逆方法，通过分析基于10be的地磁古强度重建与基于磁化的地磁古强度重建之间的偏差，可以评估北大西洋深水形成在冰期/间冰期时间尺度上的变异性和/或可能的太阳长期磁变异性。此外，可以通过分析10Be信号与磁化信号之间的时间偏移来检验磁化信号的“深度锁定”的可变性。

A record of geomagnetic paleointensity over the past 350,000 years will be generated based on high resolution 10Be-Records from two highly accumulating marine sediment cores: ODP Leg 172, Site 1063 and ODP Leg 177, Site 1089. To extract the global 10Be-production rate from the sedimentary records, a special transport-correction procedure is applied. This procedure comprises the Thorium-normalization method to correct for sediment redistribution and ocean model calculations to quantify the lateral transport of Th and 10Be in the ocean. The well known relation between relative geomagnetic dipole field strength and 10Be production rate is used to reconstruct geomagnetic paleointensity over the past 350,000 years. This provides a totally independent tool for the reconstruction of the Earth`s magnetic field strength that can be used complementary to conventional paleomagnetic methods. By using an inverse approach, variability of North Atlantic deep water formation on glacial/interglacial timescales and/or a possible solar long term magnetic variability can be assessed by analyzing the deviations between the 10Be-based and magnetization-based reconstructions of geomagnetic paleointensity. Furthermore, the variability of the "lock in depth" of the magnetization signal may be examined by analyzing the offset in time between the 10Be signal and the magnetization signal.