In search of long-term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes
Article first published online: 30 AUG 2013
©2013. American Geophysical Union. All Rights Reserved.
Geochemistry, Geophysics, Geosystems
Volume 14, Issue 8, pages 3234–3249, August 2013
How to Cite
2013), In search of long-term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes, Geochem. Geophys. Geosyst., 14, 3234–3249, doi:10.1002/ggge.20174., , , , , and (
- Issue published online: 24 SEP 2013
- Article first published online: 30 AUG 2013
- Accepted manuscript online: 24 MAY 2013 11:47PM EST
- Manuscript Accepted: 14 MAY 2013
- Manuscript Revised: 6 MAY 2013
- Manuscript Received: 12 MAR 2013
- National Science Foundation. Grant Numbers: EAR9805164, EAR0838257, EAR0809709, EAR1141840
- paleosecular variation;
- Jan Mayen;
- geomagnetic field.
 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 ZAm2) is high in comparison to Antarctica over the same time interval (34.8 ± 8.2 ZAm2), 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 105−106 years.