Eccentricity-paced geomagnetic field and monsoon rainfall variations over the last 870 kyr.

Zhou, Weijian, Kong, Xianghui, Paterson, Greig A ORCID: 0000-0002-6864-7420, Sun, Youbin, Wu, Yubin, Ao, Hong, Xian, Feng, Du, Yajuan, Tang, Ling, Zhou, Jie
et al (show 4 more authors) (2023) Eccentricity-paced geomagnetic field and monsoon rainfall variations over the last 870 kyr. Proceedings of the National Academy of Sciences of the United States of America, 120 (17). e2211495120-e2211495120.

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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 <sup>10</sup>Be-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 <sup>10</sup>Be<i><sub>GM</sub></i> flux (a proxy for geomagnetic field-induced <sup>10</sup>Be 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 <sup>10</sup>Be-derived rainfall exhibits distinct ~100 kyr glacial-interglacial cycles, and superimposed precessional (~23 kyr) cycles that match with those in Chinese speleothem δ<sup>18</sup>O 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.

Item Type: Article
Uncontrolled Keywords: Chinese loess, cosmogenic 10Be, geomagnetic field, Asian monsoon rainfall, orbital eccentricity
Divisions: Faculty of Science and Engineering > School of Environmental Sciences
Depositing User: Symplectic Admin
Date Deposited: 05 May 2023 07:28
Last Modified: 23 Aug 2023 02:46
DOI: 10.1073/pnas.2211495120
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