| 地幔对流环型场的激发(Ⅰ) |
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| 引用本文： | 李西林,许厚泽.地幔对流环型场的激发(Ⅰ)[J].地球物理学进展,1993(2). |
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| 作者姓名： | 李西林 许厚泽 |
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| 作者单位： | 中国科学院测量与地球物理研究所，中国科学院测量与地球物理研究所 武昌 430077，武昌 430077 |
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| 摘 要： | 讨论了地幔内部的粘滞度及施加在地表和CMB 的边界条件对地幔对流环型场的激发分析表明,当粘滞度侧向均匀时,环型场与极型场自然解耦,且环型场不影响重力位,当粘滞度侧向不均时,环型场与极型场耦合在一起.两者共同影响重力位.当引入板块运动速度时,边界条件非零,也能激发环型场;对侧向均匀粘滞度地幔,零边界条件不能激发环型场
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| 关 键 词： | 粘滞度侧向(非)均匀 环型场 (非)零边界条件 |
THE EXCITEMENT OF THE TOROIDAL FIELD IN MANTLE CONVECTION |
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| Li Xilin Xu Houze.THE EXCITEMENT OF THE TOROIDAL FIELD IN MANTLE CONVECTION[J].Progress in Geophysics,1993(2). |
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| Authors: | Li Xilin Xu Houze |
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| Abstract: | The excitement of toroidal field in mantle convection by the viscosity within the mantle and theboundary conditions applied to the earth's surface and the CMB was discussed.Analyses show that in themantle with lateral homogeneous viscosity the toroidal field decouples from the poloidal field and doesn'taffect the gravitational potential;While in the mantle with lateral inhomogenous viscosity the toroidal fieldand the poloidal field couple together and both affect the gravitational.When the plate velocities are in-troduced,the boundary condition becomes nonzero.This nonzero boundary condition can excite toroidalfield.But in a homogeneous mantle,the zero boundary condition can't excite toroidal field. |
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| Keywords: | Lateral heterogenety of the viscosity The toroidal field (Non-)Zero Boundary condition |
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