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

Wellington P. Oliveira (), Gelvam A. Hartmann, Filipe Terra-Nova, Natália G. Pasqualon, Jairo F. Savian, Evandro F. Lima, Fernando R. Luz and Ricardo I. F. Trindade
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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
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

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-53688-2

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