Convection in the Earth's inner core
Convection in the Earth's inner core
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DOI：
10.1016/j.pepi.2012.03.008
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发表时间：
2012-05-01
影响因子：
2.3
通讯作者：
Buffett, Bruce
中科院分区：
文献类型：
--
作者：
Cottaar, Sanne;Buffett, Bruce
在过去的二十年里，已经提出了支持和反对在内核中发生热对流的论点。在这里，我们使用热化学对流的数值模拟开发参数化模型的内部核心的热和化学演化。参数值的广泛搜索表明，热对流是可行的，特别是在内核的早期阶段。对于热导率为36 Wm（-1）K-1的情况，对流所需的最小核幔边界热通量类似于4.1 TW，对应于最大内核年龄为1.93戈伊。热通量大于6.3 TW（年龄
Over the past two decades arguments have been made for and against the occurrence of thermal convection in the inner core. Here we use numerical simulations of thermochemical convection to develop parameterized models for the thermal and chemical evolution of the inner core. A broad search of parameter values shows that thermal convection is feasible, particularly in the early stages of the inner core. For a thermal conductivity of 36 Wm(-1) K-1, the minimum core-mantle boundary heat flux required for convection is similar to 4.1 TW, corresponding to a maximum inner core age of 1.93 Gy. A heat flux greater than similar to 6.3 TW (age