MCADAM: A continuous paleomagnetic dipole moment model for at least 3.7 billion years
MCADAM: A continuous paleomagnetic dipole moment model for at least 3.7 billion years
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MCADAM：至少 37 亿年的连续古地磁偶极矩模型
DOI：
10.1002/essoar.10512285.1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Bono R
中科院分区：
文献类型：
--
作者：
Bono R
了解地球磁场的演变可以提供对核心过程的洞察，并可以约束板块构造和大气屏蔽。绝对古强度数据库品脱提供了场地平均值(即冷却单位)的精选储存库，即磁场强度的估计。我们通过添加来自34项研究的295条记录，将PINT数据库更新到8.1.1版。PINT数据库被用来定义偶极场的连续模型，使用一种结合了非参数和蒙特卡罗(MC)重采样的方法，称为蒙特卡洛轴偶极子平均模型(McAdam)。提出了从50ka到3.7-4.2aGa(MCADAM.1a-c)的三个偶极子场强模型，反映了三个日益严格的数据选择层次。麦克亚当模型允许估计磁阻距离，从而限制地球大气层免受地球发电机提供的太阳风侵蚀的屏蔽。
Understanding the evolution of Earth's magnetic field can provide insights into core processes and can constrain plate tectonics and atmospheric shielding. The absolute paleointensity database PINT provides a curated repository of site mean (i.e., cooling unit), estimates of the strength of the magnetic field. We present a minor update to the PINT database to version 8.1.1 by adding 295 records from 34 studies. The PINT database is used to define a continuous model of the dipole field, using an approach combining non‐parametric and Monte Carlo (MC) resampling termed Monte Carlo Axial Dipole Average Model (MCADAM). Three dipole field strength models spanning 50 ka to 3.7–4.2 Ga (MCADAM.1a‐c) are presented, reflecting three tiers of increasingly more stringent data selection. The MCADAM models allow for the estimation of the magnetic standoff distance, constraining the shielding of Earth's atmosphere against solar wind erosion provided by the geodynamo.