The dynamical regime of fluid flow at the core surface
The dynamical regime of fluid flow at the core surface
复制标题
核心表面流体流动的动态状态
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
J. Bloxham
中科院分区：
文献类型：
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作者：
J. Bloxham
本文提出了一种确定核幔边界下流体运动的替代方法，它是基于求解完全非线性的核运动问题。这种方法用于检验有关流动的三个动力学假设：（1）定常运动假设;（2）地转假设;（3）环形流动假设。与地转流相比，用环向流得到的场拟合得更好，这使人们对地转假设的有效性产生了相当大的怀疑。此外，一些迹象表明，失败的冻结通量近似，伴随的假设，可能是一个严重的障碍，以获得可靠的地图的核心流体流动。
An alternative method for determining the fluid motion immediately beneath the core-mantle boundary is presented which is based on solving the full nonlinear core motions problem. This method is used to examine three dynamical hypotheses about the flow: (1) the steady motions hypothesis; (2) the geostrophic hypothesis; and (3) the toroidal flow hypothesis. Better fits to the field are obtained with the toroidal flows than with geostrophic flows, casting considerable doubt on the validity of the geostrophic hypothesis. Additionally, some indication is found that failure of the frozen-flux approximation, a concomitant assumption, may be a serious obstacle to obtaining reliable maps of the core fluid flow.