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In search of long-term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes
Authors
CG Constable
G Cromwell
+4 more
AAP Koppers
RB Pedersen
H Staudigel
L Tauxe
Publication date
1 August 2013
Publisher
eScholarship, University of California
Abstract
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. © 2013. American Geophysical Union. All Rights Reserved
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Sustaining member
eScholarship - University of California
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oai:escholarship.org:ark:/1303...
Last time updated on 25/12/2021
Sustaining member
eScholarship - University of California
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:escholarship.org:ark:/1303...
Last time updated on 25/12/2021