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首页> 外文期刊>Chinese science bulletin >Efects of sub-lithospheric small-scale convection with a Newtonian rheology on the seafloor topography and heat flux
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Efects of sub-lithospheric small-scale convection with a Newtonian rheology on the seafloor topography and heat flux

机译：牛顿流变区的岩石圈下小尺度对流对海底地形和热通量的影响

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摘要

Seafloor topography and heat flux show dear dependence on the age of seafloor. A half-space cooling (HSC) model can reproduce seafloor topography and heat flux data for younger seafloor, but for older seafloor the observations show reduced variations with the age in comparison with the HSC model predictions. The deviation was attributed to the sub-lithospherie small-scale (SSC) convection first by Parsons and McKenzie (1978). While there is little doubt that the SSC can enhance heat flux at relatively old seafloor, questions were raised as to whether or aot the SSC can actually lead to a reduced topography. In this study, the effects of SSC on seafloor topography and heat flux are investigated by formulating a 2-D thermal convection model that is parallel to plate motion. Instead of using closed boundary conditions, which will bring large pressure effects because of return flow, a flow through boundary condition is adopted. The results show that although the SSC enhances the surface heat flux, it has little effects on topography for the fluids with a more realistic rheology. The reason for this is that the SSC transports the heat from the bottom to the top and cools down the whole fluids, and with the existence of a stagnant lid, the whole effects on topography are negligible.
机译：海底地形和热通量显示出对海底年龄的依赖。半空间冷却（HSC）模型可以再现年轻海底的海底地形和热通量数据，但对于较旧的海底，与HSC模型的预测相比，观察结果显示随着年龄的变化减小。偏差是由Parsons和McKenzie（1978）首先将其归因于亚岩体小尺度（SSC）对流。尽管毫无疑问，SSC可以提高相对较老的海底的热通量，但有人质疑SSC是否可以实际上导致地形减小。在这项研究中，通过建立与板块运动平行的二维热对流模型，研究了南南合作对海底地形和热通量的影响。代替使用封闭的边界条件，因为回流会给压力带来较大的影响，而是采用流经边界条件。结果表明，尽管SSC增强了表面热通量，但对于具有更逼真的流变性的流体，它对地形的影响很小。这是因为SSC将热量从底部传递到顶部，并冷却了所有流体，并且由于盖子的停滞，对地形的整体影响可以忽略不计。

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