Multidecadally resolved polarity oscillations during a geomagnetic excursion

Author:

Chou Yu-Min12,Jiang Xiuyang3,Liu Qingsong24,Hu Hsun-Ming1,Wu Chung-Che1,Liu Jianxing45,Jiang Zhaoxia6,Lee Teh-Quei7,Wang Chun-Chieh8,Song Yen-Fang8,Chiang Cheng-Cheng8,Tan Liangcheng910ORCID,Lone Mahjoor A.1ORCID,Pan Yongxin11,Zhu Rixiang11,He Yaoqi12,Chou Yu-Chen1,Tan An-Hung13,Roberts Andrew P.14,Zhao Xiang14,Shen Chuan-Chou115

Affiliation:

1. High-Precision Mass Spectrometry and Environment Change Laboratory, Department of Geosciences, National Taiwan University, 10617 Taipei, Taiwan, Republic of China;

2. Department of Ocean Science and Engineering, Southern University of Science and Technology, 518055 Shenzhen, People’s Republic of China;

3. Key Laboratory of Humid Subtropical Eco-Geographical Processes, Ministry of Education, College of Geography Science, Fujian Normal University, 350117 Fuzhou, People’s Republic of China;

4. Laboratory for Marine Geology, Qingdao National Oceanography Laboratory for Science and Technology, 266237 Qingdao, People’s Republic of China;

5. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, 266061 Qingdao, People’s Republic of China;

6. College of Marine Geosciences, Ocean University of China, 266100 Qingdao, People’s Republic of China;

7. Institute of Earth Sciences, Academia Sinica, 11529 Taipei, Taiwan, Republic of China;

8. National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan, Republic of China;

9. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi’an, People’s Republic of China;

10. Institute of Global Environmental Change, Xi’an Jiaotong University, 710049 Xi’an, People’s Republic of China;

11. Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, People’s Republic of China;

12. College of Tourism and Air Service, Guizhou Minzu University, 550025 Guiyang, People’s Republic of China;

13. Department of Mechanical Engineering, Chien Hsin University of Science and Technology, 32097 Taoyuan, Taiwan, Republic of China;

14. Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia;

15. Research Center for Future Earth, National Taiwan University, 10617 Taipei, Taiwan, Republic of China

Abstract

Significance A stalagmite-based paleomagnetic record of the post-Blake excursion reveals details of repeated centennial–millennial interhemispheric polarity drifts and saw-tooth inclination oscillations during periods of low geomagnetic field intensity at 100 thousand years before present. One surprisingly abrupt centennial reversal transition occurred in 144 ± 58 years (2σ) and provides unprecedented evidence that raises fundamental questions about the speed of geomagnetic field shifts. Such rapid polarity changes could severely affect satellites and human society in the future if the current geomagnetic field intensity continues to decrease.

Funder

Ministry of Science and Technology, Taiwan

National Taiwan University

Higher education sprout project of the ministry of education, Taiwan

Southern University of Science and Technology, China

National Natural Science Foundation of China

National Synchrotron Radiation Research Center, Taiwan

Publisher

Proceedings of the National Academy of Sciences

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