Effects of a radially varying electrical conductivity on 3D numerical dynamos

被引:23
|
作者
Gomez-Perez, Natalia [1 ]
Heimpel, Moritz [2 ]
Wicht, Johannes [3 ]
机构
[1] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada
[3] Max Planck Inst Solar Syst Res, D-37191 Katlenburg Lindau, Germany
关键词
Variable electrical conductivity; Numerical dynamos; Geodynamo; Mercury; PLANETARY MAGNETIC-FIELDS; ROTATING SPHERICAL-SHELL; EARTHS CORE; INNER-CORE; MAGNETOHYDRODYNAMIC DYNAMO; GIANT PLANETS; OUTER CORE; CONVECTION; MERCURY; MODELS;
D O I
10.1016/j.pepi.2010.03.006
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The transition from liquid metal to silicate rock in the cores of the terrestrial planets is likely to be accompanied by a gradient in the composition of the outer core liquid. The electrical conductivity of a volatile-enriched liquid alloy can be substantially lower than a light-element-depleted fluid found close to the inner core boundary. In this paper, we investigate the effect of radially variable electrical conductivity on planetary dynamo action using an electrical conductivity that decreases exponentially as a function of radius. We find that numerical solutions with continuous, radially outward decreasing electrical conductivity profiles result in strongly modified flow and magnetic field dynamics, compared to solutions with homogeneous electrical conductivity. The force balances at the top of the simulated fluid determine the overall character of the flow. The relationship between Coriolis, and Lorentz forces near the outer core boundary controls the flow and magnetic field intensity and morphology of the system. Our results imply that a low conductivity layer near the top of Mercury's liquid outer core is consistent with its weak magnetic field. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:42 / 53
页数:12
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