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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Temporal variations in the convective style of planetary mantles
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Temporal variations in the convective style of planetary mantles

机译：行星地幔对流方式的时间变化

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摘要

Investigations of mantle convection with temperature- and strain-rate-dependent viscosity have shown the existence of fundamentally different convective styles: By varying e.g. the Rayleigh number, the viscosity contrast or the strain-rate dependency of viscosity, the planform of convection in the asymptotic stationary state changes from the so-called stagnant lid regime to an episodic behaviour and further to a state characterised by a permanently mobilised surface. Our studies suggest that this transition may not only be induced by a change of parameters but also occurs temporally for fixed parameters. We have in fact observed convective systems in the stagnant lid regime that show isolated events of surface mobilisation occurring out of a thermally equilibrated state. We use a 3D numerical mantle convection model to investigate mantle convection and surface dynamics as a coupled fluid dynamical system. Our studies focus on the existence of a transitional regime in which temporal variations between the stagnant lid and the episodic regime occur. We were able to deduce a mobilisation criterion that describes the stability of the stagnant surface, thus allowing for a quantitative analysis of the transition to a (temporarily) mobilised surface. This criterion is also suitable to predict the occurrence of surface mobilisation events. (c) 2006 Elsevier B.V All rights reserved.
机译：对与温度和应变率有关的粘度的地幔对流的研究表明，存在着根本不同的对流方式：通过改变例如瑞利数，粘度对比或粘度的应变率相关性，渐进固定状态下的对流平面形式从所谓的停滞盖状态变为间歇性行为，并进一步变为具有永久性活动表面的状态。我们的研究表明，这种转变不仅可能是由于参数的变化而引起的，而且对于固定参数也可能暂时发生。实际上，我们已经观察到在停滞的盖罩状态下的对流系统，这些对流系统显示出在热平衡状态之外发生的表面动员的孤立事件。我们使用3D数值地幔对流模型来研究地幔对流和表面动力学，并将其作为耦合的流体动力学系统。我们的研究集中在过渡制度的存在上，在这种制度中停滞的眼睑和情节制度之间会发生时间变化。我们能够推断出描述停滞表面稳定性的动员标准，从而可以定量分析过渡到（临时）动员表面的情况。该标准也适合于预测表面动员事件的发生。 （c）2006 Elsevier B.V保留所有权利。

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