西峰黄土剖面粒度分布数据集（0.15Ma以来）

西峰黄土剖面各种粒径的颗粒度分布曲线都有相似的特征。颗粒度分布与10Be浓度分布比较表明，存在一个向下20cm左右的移动。土壤层中，粘土颗粒移动通常是会发生的。然而，我们假设10Be非常牢固地吸附在粒子上，并与粒子移动有着相同的经历。因此，我们认为颗粒移动现象是由于风化作用造成的。然而，风化作用引起的颗粒分布变化并不影响10Be的浓度分布。

The particle size distribution curves of various grain sizes in the Xifeng Loess Profile all exhibit similar characteristics. Comparison between the particle size distribution and the 10Be concentration distribution reveals a downward shift of approximately 20 cm. Clay particle movement commonly occurs in soil layers. However, we assume that 10Be is adsorbed very tightly onto particles and undergoes the same transport processes as the particles. We therefore attribute the observed particle movement to weathering processes. However, changes in particle size distribution induced by weathering do not affect the 10Be concentration distribution.