| 横向黏度变化对球层中热对流的影响 |
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| 引用本文： | 朱涛,王兰炜,陈化然.横向黏度变化对球层中热对流的影响[J].地球物理学报,2010,53(2):350-361. |
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| 作者姓名： | 朱涛 王兰炜 陈化然 |
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| 作者单位： | 1.中国地震局地球物理研究所，100081 北京;2.中国地震局地壳应力研究所，100089 北京 |
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| 基金项目： | 国家自然基金，国家重点基础研究发展计划(973计划)，国家地壳探测工程 |
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| 摘 要： | 本文在常黏度的基础上，加上横向黏度变化，纯粹研究了横向黏度变化对球层中热对流的影响.结果表明，横向黏度变化可以加速或阻碍球层中的热对流，并对球层中热传输方式有调节作用，但是横向黏度变化对球层中热对流的影响会限制在一定的强度范围内，并且难以改变球层中热对流的格局.横向黏度变化所产生的环型场速度占总速度场的比例最多为十几个百分点，难以解释观测到的地表板块运动中的环型场能量大小.
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| 关 键 词： | 热对流 横向黏度变化 牛顿流体 球层 |
| 收稿时间： | 2009-10-13 |
| 修稿时间： | 2010-01-20 |
Effects of lateral viscosity variation on thermal convection in a spherical shell |
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| ZHU Tao,WANG Lan-Wei,CHEN Hua-Ran.Effects of lateral viscosity variation on thermal convection in a spherical shell[J].Chinese Journal of Geophysics,2010,53(2):350-361. |
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| Authors: | ZHU Tao WANG Lan-Wei CHEN Hua-Ran |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, 100081 Beijing，China;2.Institute of Crustal Dynamics, China Earthquake Administration, 100089 Beijing，China |
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| Abstract: | In this paper, the effects of lateral viscosity variation (LVV) on thermal convection in a spherical shell are studied for the case of the summation of constant viscosity and LVV. The results show that LVV may accelerate or decelerate thermal convection and adjust thermal transport way in a spherical shell. However, the LVV of affecting thermal convection will be limited in a certain range and can't change the patterns of thermal convection. The ratio of the toroidal velocity due to LVV to total one is at most over ten percents, which can't match the energy of the observed toroidal field of surface plate motions. |
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| Keywords: | Thermal convection Lateral viscosity variation Newtonian fluid Spherical shell |
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