Physics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...33..255g&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 33, Dec. 1983, p. 255-259.
Physics
8
Climatology, Dynamo Theory, Earth Core, Earth Mantle, Geomagnetism, Pressure Effects, Earth Crust, Integral Equations, Paleontology, Shear Stress
Scientific paper
A physical mechanism is needed to relate magnetic field reversals with ice ages, tectonic events and tectite falls. Pressure changes in the core due to mantle events would affect the freezing rate of the liquid core, thereby modifying the power supplied to the dynamo. A sufficiently large modification would set off a reversal, or perhaps a change in dynamo operational mode from a nonreversing to a reversing state. Attention is given to the Gubbins et al., (1979) model, which allows a quantitative calculation to be made for the effect of a pressure change on the energy release. A continuous process of mantle differentiation leading to the formation of an upper mantle from an initially homogeneous mantle can only provide 10 percent of the required pressure change, but the effect cannot be ruled out as a power source for the dynamo because uncertainties in the calculations can amount to at least an order of magnitude.
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