In search of long‐term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes

DOI Web Site Web Site 被引用文献3件
  • G. Cromwell
    Geosciences Research Division Scripps Institution of Oceanography University of California San Diego 9500 Gilman Drive La Jolla California 92093‐0220 USA
  • L. Tauxe
    Geosciences Research Division Scripps Institution of Oceanography University of California San Diego 9500 Gilman Drive La Jolla California 92093‐0220 USA
  • H. Staudigel
    Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • C. G. Constable
    Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography University of California San Diego La Jolla California USA
  • A. A. P. Koppers
    College of Earth Ocean and Atmospheric Sciences Oregon State University Corvallis Oregon USA
  • R.‐B. Pedersen
    Department of Earth Science Centre for Geobiology University of Bergen Bergen Norway

書誌事項

公開日
2013-08
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/ggge.20174
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Investigations of the behavior of the geomagnetic field on geological timescales rely on globally distributed data sets from dated lava flows. We present the first suitable data from the Arctic region, comprising 37 paleomagnetic directions from Jan Mayen (71°N, 0.2–461 ka) and Spitsbergen (79°N, 1–9.2 Ma) and five paleointensity results. Dispersion of the Arctic virtual geomagnetic poles over the last 2 Ma (27.3 ± 4.0°) is significantly lower than that from published Antarctic data sets (32.1 ± 5.0°). Arctic average virtual axial dipole moment (76.8 ± 24.3 ZAm<jats:sup>2</jats:sup>) is high in comparison to Antarctica over the same time interval (34.8 ± 8.2 ZAm<jats:sup>2</jats:sup>), although the data are still too sparse in the Arctic to be definitive. These data support a long‐lived hemispheric asymmetry of the magnetic field, contrasting higher, more stable fields in the north with lower average strength and more variable field directions in the south. Such features require significant non‐axial‐dipole contributions over 10<jats:sup>5</jats:sup>−10<jats:sup>6</jats:sup> years.</jats:p>

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