Variaciones temporales de miles de años en la intensidad del dipolo axial geomagnético en el Holoceno a partir de reconstrucciones paleomagnéticas

  1. A. González-López 1
  2. S.A. Campuzano 2
  3. A. Molina-Cardín 1
  4. F.J. Pavón-Carrasco 1
  5. A. De Santis 3
  6. M.L. Osete 1
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Instituto de Geociencias IGEO (UCM – CSIC)
  3. 3 Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Ano de publicación: 2021

Título do exemplar: X Congreso Geológico de España

Número: 18

Páxinas: 714

Tipo: Artigo

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Outras publicacións en: Geotemas (Madrid)

Resumo

Paleomagnetic reconstructions based on paleomagnetic and archeomagnetic data allow us to know the geomagnetic field variability in the past. We analyse the long-term variations in the axial dipole intensity during the Holocene using two paleo- magnetic reconstructions: SHA.DIF.14k (Pavón-Carrasco et al., 2014) and CALS10k.2 (Constable et al., 2016). They show two decay time intervals between 7000 BC and 4000 BC, approximately, and from around 350 – 100 BC to the present time. There is only one time interval when the strength of the axial dipole increases, between 4000 BC and 350 – 100 BC. We have modelled the last increase and decrease of the axial dipole field as a combination of a diffusive process (represented with an exponential decay) plus a pulse (a skewed normal function). Model results provide characteristic decay times between 11000 and 15000 yr, which are compatible with the diffusion times of the dipole field given by the geodynamo approaches. Comparing our model with the actual variations of the axial dipole field, we observed that the diffusion process takes nearly the 50% of the increase provided by the pulse.

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