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Variations in the geomagnetic dipole moment during the Holocene and the past 50 kyr

Author:
  • Mads Faurschou Knudsen
  • Peter Riisager
  • Fabio Donadini
  • Ian Snowball
  • Raimund Muscheler
  • Kimmo Korhonen
  • Lauri J. Pesonen
Publishing year: 2008
Language: English
Pages: 319-329
Publication/Series: Earth and Planetary Science Letters
Volume: 272
Issue: 1-2
Document type: Journal article
Publisher: Elsevier

Abstract english

All absolute paleointensity data published in peer-reviewed journals were recently compiled in the GEOMACIA50 database. Based on the information in GEOMAGIA50, we reconstruct variations in the geomagnetic dipole moment over the past 50 kyr, with a focus on the Holocene period. A running-window approach is used to determine the axial dipole moment that provides the optimal least-squares fit to the paleointensity data, whereas associated error estimates are constrained using a bootstrap procedure. We Subsequently compare the reconstruction from this study with previous reconstructions of the geomagnetic dipole moment, including those based on cosmogenic radionuclides (Be-10 and C-14). This comparison generally lends Support to the axial dipole moments obtained in this study. Our reconstruction shows that the evolution of the dipole moment was highly dynamic, and the recently observed rates of change (5% per century) do not appear unique. We observe no apparent link between the occurrence of archeomagnetic jerks and changes in the geomagnetic dipole moment, Suggesting that archeomagnetic jerks most likely represent drastic changes in the orientation of the geomagnetic dipole axis or periods characterized by large secular variation of the non-dipole field. This Study also shows that the Holocene geomagnetic dipole moment was high compared to that of the preceding similar to 40 kyr, and that similar to 4.10(22) Am-2 appears to represent a critical threshold below which geomagnetic excursions and reversals occur. (C) 2008 Elsevier B.V. All rights reserved.

Keywords

  • Geology
  • jerks
  • archeomagnetic
  • Holocene
  • paleointensity
  • geomagnetic dipole moment
  • geomagnetic excursions
  • cosmogenic nuclides

Other

Published
  • ISSN: 1385-013X
Raimund Muscheler
E-mail: raimund.muscheler [at] geol.lu.se

Professor

Quaternary Sciences

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