地球磁场
地质学
黄土
间冰期
古土壤
气候学
地磁长期变化
季风
古气候学
磁性地层学
冰期
斯佩莱奥瑟姆
东亚季风
地磁反转
米兰科维奇循环
地球物理学
古地磁
气候变化
古生物学
地理
海洋学
磁场
地磁风暴
物理
量子力学
洞穴
考古
作者
Weisheng Zhou,Xianghui Kong,Greig A. Paterson,Youbin Sun,Yubin Wu,Hong Ao,Feng Xian,Yi Du,Ling Tang,Jie Zhou,Zhengguo Shi,T. Jull,Zhao Guo,Zhisheng An
标识
DOI:10.1073/pnas.2211495120
摘要
Whether there are links between geomagnetic field and Earth's orbital parameters remains unclear. Synchronous reconstructions of parallel long-term quantitative geomagnetic field and climate change records are rare. Here, we present 10Be-derived changes of both geomagnetic field and Asian monsoon (AM) rainfall over the last 870 kyr from the Xifeng loess-paleosol sequence on the central Chinese Loess Plateau. The 10BeGM flux (a proxy for geomagnetic field-induced 10Be production rate) reveals 13 consecutive geomagnetic excursions in the Brunhes chron, which are synchronized with the global records, providing key time markers for Chinese loess-paleosol sequences. The 10Be-derived rainfall exhibits distinct ~100 kyr glacial-interglacial cycles, and superimposed precessional (~23 kyr) cycles that match with those in Chinese speleothem δ18O record. We find that changes in the geomagnetic field and AM rainfall share a common ~100 kyr cyclicity, implying a likely eccentricity modulation of both the geomagnetic field and climate.
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