Intermittent non-axial dipolar-field dominance of twin Laschamp excursions

Hyodo, Masayuki; Nakagawa, Takeshi; Matsushita, Hayato; Kitaba, Ikuko; Yamada, Keitaro; Tanabe, Shota; Bradák, Balázs; Miki, Masako; McLean, Danielle; Staff, Richard A.; Smith, Victoria C.; Albert, Paul G.; Bronk Ramsey, Christopher; Yamasaki, Akiteru; Kitagawa, Junko; Schlolaut, Gordon; Gotanda, Katsuya; Tsumura, Kosuke; Inagawa, Kaito; Kumazawa, Koyo; Abe, Haruka; Sugo, Saki; Takahashi, Koki; Kitamura, Atsumi

doi:10.1038/s43247-022-00401-0

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Intermittent non-axial dipolar-field dominance of twin Laschamp excursions

Authors

Hyodo, Masayuki
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Nakagawa, Takeshi
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Matsushita, Hayato
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Kitaba, Ikuko
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Yamada, Keitaro
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Tanabe, Shota
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Bradák, Balázs
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Miki, Masako
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McLean, Danielle
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Staff, Richard A.
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Smith, Victoria C.
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Albert, Paul G.
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Bronk Ramsey, Christopher
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Yamasaki, Akiteru
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Kitagawa, Junko
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Schlolaut, Gordon
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Gotanda, Katsuya
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Tsumura, Kosuke
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Inagawa, Kaito
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Kumazawa, Koyo
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Abe, Haruka
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Sugo, Saki
External Organizations;

Takahashi, Koki
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Kitamura, Atsumi
External Organizations;

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Citation

Hyodo, M., Nakagawa, T., Matsushita, H., Kitaba, I., Yamada, K., Tanabe, S., Bradák, B., Miki, M., McLean, D., Staff, R. A., Smith, V. C., Albert, P. G., Bronk Ramsey, C., Yamasaki, A., Kitagawa, J., Schlolaut, G., Gotanda, K., Tsumura, K., Inagawa, K., Kumazawa, K., Abe, H., Sugo, S., Takahashi, K., Kitamura, A. (2022): Intermittent non-axial dipolar-field dominance of twin Laschamp excursions. - Communications Earth & Environment, 3, 79.
https://doi.org/10.1038/s43247-022-00401-0

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015121

Abstract

Geomagnetic excursions represent the dynamic nature of the geodynamo. Accumulated palaeomagnetic records indicate that such excursions are dominated by dipolar-fields, but exhibit different structures. Here we report a palaeomagnetic record from the varved sediments of Lake Suigetsu, central Japan, which reveals fine structures in the Laschamp Excursion and a new post-Laschamp excursion that coincides with the Δ14C maxima. The record’s high-resolution chronology provides IntCal20 mid-ages and varve-counted durations. Both excursions comprise multiple subcentennial directional-swings. Simulations of filtering effects on sediment-magnetisations demonstrate that this high-resolution record replicates most of the features in existing, lower-resolution Laschamp excursion records, including the apparent clockwise open-loop of the virtual geomagnetic pole pass. The virtual geomagnetic poles during the ‘swing’ phases make four clusters centred in hemispherically-symmetric regions, three of which encompass the virtual geomagnetic poles associated with the Laschamp Excursion recorded in lavas at various locations. The stationary dipolar-field sources under each cluster should have intermittently dominated one after another during the excursions.