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

Knudsen, Mads Faurschou; Riisager, Peter; Donadini, Fabio; Snowball, Ian LU ; Muscheler, Raimund LU ; Korhonen, Kimmo and Pesonen, Lauri J. (2008) In Earth and Planetary Science Letters 272(1-2). p.319-329
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
jerks, archeomagnetic, Holocene, paleointensity, geomagnetic dipole moment, geomagnetic excursions, cosmogenic nuclides
in
Earth and Planetary Science Letters
volume
272
issue
1-2
pages
319 - 329
publisher
Elsevier
external identifiers
  • wos:000259119900031
  • scopus:47749111663
ISSN
1385-013X
DOI
10.1016/j.epsl.2008.04.048
language
English
LU publication?
yes
id
bed39e39-9c64-4ab5-9343-21016e726f24 (old id 1247002)
date added to LUP
2008-11-17 11:23:30
date last changed
2017-10-22 03:42:48
@article{bed39e39-9c64-4ab5-9343-21016e726f24,
  abstract     = {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.},
  author       = {Knudsen, Mads Faurschou and Riisager, Peter and Donadini, Fabio and Snowball, Ian and Muscheler, Raimund and Korhonen, Kimmo and Pesonen, Lauri J.},
  issn         = {1385-013X},
  keyword      = {jerks,archeomagnetic,Holocene,paleointensity,geomagnetic dipole moment,geomagnetic excursions,cosmogenic nuclides},
  language     = {eng},
  number       = {1-2},
  pages        = {319--329},
  publisher    = {Elsevier},
  series       = {Earth and Planetary Science Letters},
  title        = {Variations in the geomagnetic dipole moment during the Holocene and the past 50 kyr},
  url          = {http://dx.doi.org/10.1016/j.epsl.2008.04.048},
  volume       = {272},
  year         = {2008},
}