Coupling of the core dynamo and mantle: Thermal or topographic?
作者:
David Gubbins,
Mark Richards,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 13
页码: 1521-1524
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i013p01521
数据来源: WILEY
摘要:
Static features in the earth's magnetic field and fixed sources of secular variation suggest the dynamo is anchored to the lowermost mantle via either thermal or topographic coupling. Here we show a correspondence with dynamic core topography, which is related to mantle temperature, and suggest further effects due to topography associated with subducting slabs. The two coupling mechanisms may occur on different time scales, providing a potential means for discriminating between them.
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