Multidecadally resolved polarity oscillations during a geomagnetic excursion

Author:

Chou Yu-Min,Jiang Xiuyang,Liu Qingsong,Hu Hsun-Ming,Wu Chung-Che,Liu Jianxing,Jiang Zhaoxia,Lee Teh-Quei,Wang Chun-Chieh,Song Yen-Fang,Chiang Cheng-Cheng,Tan LiangchengORCID,Lone Mahjoor A.ORCID,Pan Yongxin,Zhu Rixiang,He Yaoqi,Chou Yu-Chen,Tan An-Hung,Roberts Andrew P.,Zhao Xiang,Shen Chuan-Chou

Abstract

Polarity reversals of the geomagnetic field have occurred through billions of years of Earth history and were first revealed in the early 20th century. Almost a century later, details of transitional field behavior during geomagnetic reversals and excursions remain poorly known. Here, we present a multidecadally resolved geomagnetic excursion record from a radioisotopically dated Chinese stalagmite at 107–91 thousand years before present with age precision of several decades. The duration of geomagnetic directional oscillations ranged from several centuries at 106–103 thousand years before present to millennia at 98–92 thousand years before present, with one abrupt reversal transition occurring in one to two centuries when the field was weakest. These features indicate prolonged geodynamo instability. Repeated asymmetrical interhemispheric polarity drifts associated with weak dipole fields likely originated in Earth’s deep interior. If such rapid polarity changes occurred in future, they could severely affect satellites and human society.

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

Subject

Multidisciplinary

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