间冰期
冰期
地质学
黄土
古土壤
环境磁学
磁铁矿
全新世
降水
磁性矿物学
高原(数学)
冰芯
自然地理学
气候学
地球化学
地球科学
地貌学
古生物学
磁铁矿
剩磁
地理
数学分析
气象学
物理
磁场
量子力学
数学
磁化
作者
Shengli Yang,Zixuan Chen,Hui Chang,Yu Luo,Li Liu,Xiaojing Liu,Qiong Li,Jiantao Zhou,Pushuang Li
摘要
Abstract Loess sequences in the eastern Tibetan Plateau (TP) are valuable paleoenvironmental archives for reconstructing the environmental history related to the Indian summer monsoon (ISM). We conducted a detailed environmental magnetism analysis of the Ganzi loess sequence that developed since the Last Interglacial (LIG) and reconstructed the paleo‐precipitation history by analyzing multiple magnetic parameters. Our results are as follows: (a) Magnetic minerals of the Ganzi loess are mainly maghemite and magnetite, with high concentrations of magnetic minerals in the paleosol layer. The pedogenic ferrimagnetic particles dominated the magnetic enhancement, and magnetic parameters can be used to reconstruct precipitation history. (b) Precipitation reconstructed by using the multiple magnetic parameters of the Ganzi loess shows that rainfall in the eastern TP has varied dramatically, and the wettest periods over the last glacial cycle were the LIG and the Holocene. (c) The ISM has influenced precipitation changes since the LIG in the eastern TP. The ISM and precipitation in the eastern TP were mainly driven by the combined effect of orbital changes, global ice volume, atmospheric CO 2 concentration, and internal climate forcing on the glacial‐interglacial timescale.
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