Scaling of stagnant-lid convection with Arrhenius rheology and the effects of mantle melting
Scaling of stagnant-lid convection with Arrhenius rheology and the effects of mantle melting
复制标题
用阿伦尼乌斯流变学缩放停滞盖对流以及地幔融化的影响
DOI：
10.1111/j.1365-246x.2009.04272.x
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发表时间：
2009
影响因子：
2.8
通讯作者：
J. Korenaga
中科院分区：
文献类型：
--
作者：
J. Korenaga
在数值模拟和尺度分析的基础上，提出了对滞盖对流尺度的一些修改，以便使其更适用于类地行星的热演化。首先研究了使用Arrhenius流变学的效果，而不是更流行的线性指数流变学，顶部热边界层的稳定性分析表明，能够捕获不同种类的温度依赖性粘度所造成的系统差异。局部稳定性分析，然后扩展到处理地幔熔融的影响，如脱水，硬化和成分浮力。一个新的热流标度律结合这些影响表明，地幔熔融可能会减少传统的预测的表面热通量的一个因素的10.5 -10，其潜在的影响，我们了解行星的演化进行了简要的讨论。
SUMMARY On the basis of numerical modelling and scaling analysis, a few modifications are proposed for the scaling of stagnant-lid convection, in order to make it more applicable to the thermal evolution of terrestrial planets. The effect of using Arrhenius rheology, as opposed to more popular linear-exponential rheology, is first investigated, and the stability analysis of top thermal boundary layer is shown to be able to capture systematic differences caused by the different kinds of temperature-dependent viscosity. The local stability analysis is then extended to handle the effects of mantle melting such as dehydration stiffening and compositional buoyancy. A new heat-flow scaling law incorporating these effects suggests that mantle melting may reduce the conventional prediction of surface heat flux by up to a factor of ∼5–10, and its potential impact on our understanding of planetary evolution is briefly discussed.