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Long-term persistency of a strong non-dipole field in the South Atlantic

Author

Listed:
  • Wellington P. Oliveira

    (Universidade Estadual de Campinas)

  • Gelvam A. Hartmann

    (Universidade Estadual de Campinas)

  • Filipe Terra-Nova

    (Laboratoire de Planétologie et Géosciences)

  • Natália G. Pasqualon

    (University of Hawai’i at Manoa
    Universidade Federal do Rio Grande do Sul)

  • Jairo F. Savian

    (Universidade Federal do Rio Grande do Sul)

  • Evandro F. Lima

    (Universidade Federal do Rio Grande do Sul)

  • Fernando R. Luz

    (Universidade Federal do Rio Grande do Sul)

  • Ricardo I. F. Trindade

    (Universidade de São Paulo)

Abstract

Earth’s magnetic field exhibits a dominant dipole morphology. Notwithstanding, significant deviations from the dipole are evident today, particularly the South Atlantic Anomaly (SAA), characterized by anomalously low-field intensity and high directional variability, diminishing the field’s shielding effect. To assess the persistence of SAA-like features over multimillion-year scales, we combine paleomagnetic data from Trindade Island (20°30’S, 29°22’W) with an evaluation of paleosecular variation (PSV) over the past 10 Myr. We employ synthetic models to explore how the position and intensity of magnetic flux patches at the core-mantle boundary can influence the long-term field behavior. Here we present results that reveal anomalous field signatures in the South Atlantic and the Atlantic-Pacific hemispheric asymmetries are enduring features, likely linked to a bottom-up control of PSV by the inner core’s heterogeneities but with contributions from mantle anomalies in the long-time range.

Suggested Citation

  • Wellington P. Oliveira & Gelvam A. Hartmann & Filipe Terra-Nova & Natália G. Pasqualon & Jairo F. Savian & Evandro F. Lima & Fernando R. Luz & Ricardo I. F. Trindade, 2024. "Long-term persistency of a strong non-dipole field in the South Atlantic," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53688-2
    DOI: 10.1038/s41467-024-53688-2
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    References listed on IDEAS

    as
    1. Andrew J. Biggin & Richard K. Bono & Domenico G. Meduri & Courtney J. Sprain & Christopher J. Davies & Richard Holme & Pavel V. Doubrovine, 2020. "Quantitative estimates of average geomagnetic axial dipole dominance in deep geological time," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    2. John A. Tarduno & Michael K. Watkeys & Thomas N. Huffman & Rory D. Cottrell & Eric G. Blackman & Anna Wendt & Cecilia A. Scribner & Courtney L. Wagner, 2015. "Antiquity of the South Atlantic Anomaly and evidence for top-down control on the geodynamo," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    3. Julien Aubert & Christopher C. Finlay & Alexandre Fournier, 2013. "Bottom-up control of geomagnetic secular variation by the Earth’s inner core," Nature, Nature, vol. 502(7470), pages 219-223, October.
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