西峰剖面午城黄土深海氧同位素数据集（1200-2600kaB.P.）

基于西峰剖面661个样品的FeD和FeT分析，建立该剖面午城黄土的古风化强度序列，并与剖面原有1.2Ma以来的序列进行对比。结果表明，早更新世古土壤的风化强度与后期相比总体较低，而黄土层的风化强度总体偏高，反映了较小的冰期-间冰期反差；古风化强度的波动总体上与深海氧同位素有较好的一致性，体现了全球冰量变化对我国北方季风环境的控制。2.6~1.6Ma期间，古土壤的平均风化强度在整个第四纪最低，指示了较弱的夏季风环境效应。从约1.6Ma开始到1.2Ma，古土壤和黄土层的风化强度均增加，并开始有较显著的约100ka周期。这些特征在深海氧同位素记录中没有表现，而与热带地区一些环境特征相吻合，从而指示了低纬过程对我国北方早更新世季风环境的显著影响。

Based on the analysis of FeD and FeT in 661 samples from the Xifeng Section, we established a paleoweathering intensity sequence for the Wucheng Loess of this section, and compared it with the pre-existing sequence of the section covering the past 1.2 million years. The results show that the paleoweathering intensity of Early Pleistocene paleosols is generally lower than that of later deposits, while that of loess layers is generally higher, reflecting a smaller glacial-interglacial contrast. The fluctuations of paleoweathering intensity generally exhibit good consistency with deep-sea oxygen isotope records, reflecting the control of global ice volume changes on the monsoonal environment of northern China. During the period of 2.6–1.6 Ma, the average paleoweathering intensity of paleosols reached the lowest level across the entire Quaternary, indicating a weaker environmental effect of the summer monsoon. From approximately 1.6 Ma to 1.2 Ma, the paleoweathering intensities of both paleosols and loess layers increased, and a prominent ~100-kyr cycle began to emerge. These features are not reflected in the deep-sea oxygen isotope records, but are consistent with some environmental characteristics in tropical regions, thus indicating the significant influence of low-latitude processes on the Early Pleistocene monsoonal environment of northern China.