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A negative test of orbital control of geomagnetic reversals and excursions

Dennis V. Kent; Julie Carlut

Title:
A negative test of orbital control of geomagnetic reversals and excursions
Author(s):
Kent, Dennis V.
Carlut, Julie
Date:
Type:
Articles
Department:
Lamont-Doherty Earth Observatory
Volume:
28
Permanent URL:
Book/Journal Title:
Geophysical Research Letters
Abstract:
A ~41 Kyr periodic component has been reported in some sedimentary paleointensity records, allowing speculation that there may be some component of orbital control of geomagnetic field generation such as by obliquity modulation. However, no discernable tendency is found for astronomically-dated geomagnetic reversals in the Plio-Pleistocene (0 to 5.3 Ma) or excursions in the Brunhes (0 to 0.78 Ma) to occur at a consistent amplitude or phase of obliquity cyclicity, nor of orbital eccentricity. An implication is that paleointensity lows which are characteristically associated with these features are not distributed in a systematic way relative to obliquity and eccentricity, supporting the idea that orbital forcing does not power the geodynamo.
Subject(s):
Geophysics
Publisher DOI:
http://dx.doi.org/10.1029/2001GL013118
Item views:
194
Metadata:
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