Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19...25l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, Jan. 3, 1992, p. 25-28.
Physics
26
Earth Core, Earth Mantle, Geomagnetism, Heat Flux, Dynamo Theory, Harmonic Oscillation, Laplace Transformation
Scientific paper
The present study investigates the validity of the concept that impulsive changes in the volume flux of material rising from the base of the mantle via plumes can cause rapid changes in the heat flux from the core and in the behavior of the geomagnetic field. The natural time scale of variations in the heat flux from the core is found to be about 10 exp 9 yr, a time scale far longer than that associated with the long-term changes in the frequency of reversals of the magnetic field; following an impulsive change in plume flux, the heat flux from the core changes on a time scale of several billion years. A lack of correlation is found between the mantle plume flux and core heat flux, which is determined to be due to the long natural time scale of the lower mantle and the large thermal inertia of the D-arcsec layer. This calls into question the currently held idea of a direct and immediate correlation between plume volume flux and heat flux from the core.
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