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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 >Inferring surface heat flux distributions guided by a global seismic model: particular application to Antarctica
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Inferring surface heat flux distributions guided by a global seismic model: particular application to Antarctica

机译：通过整体地震模型推断地表热通量分布：在南极洲的特殊应用

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摘要

We present a method that uses a global seismic model of the crust and upper mantle to guide the extrapolation of existing heat-flow measurements to regions where such measurements are rare or absent. For any chosen spatial point on the globe, the procedure generates a histogram of heat-flow values determined from existing measurements obtained from regions that are structurally similar to the target point. The inferred histograms are based on a "structural similarity functional", which is introduced to quantify the structural analogy between different regions. We apply this procedure world-wide using the global heat-flow data base of Pollack et al. [Rev. Geophys. 31 (1993) 267] guided by an update of the 3-D shear velocity model of the crust and uppermost mantle of Shapiro and Ritzwoller [Geophys. J. Int. 51 (2002) 88]. The method results in an inferred probability distribution for the heat flux for each geographical region of interest. These distributions are strongly non-Gaussian, but are well approximated by the log-logistic distribution which is completely specified by two parameters. The inferred distributions agree well with observed distributions of heat flux taken in 300-km radius circles regionally in numerous locations. Particular attention is drawn to the inferred surface heat flux distributions across Antarctica, where direct measurements are rare but information about heat flow may be needed to help understand the dynamics of the Antarctic ice sheets and ice streams. Mean heat flow in West Antarctica is expected to be nearly three times higher than in East Antarctica and much more variable. This high heat flow may affect the dynamics of West Antarctic ice streams and the stability of the West Antarctic Ice Sheet.
机译：我们提出了一种使用地壳和上地幔的整体地震模型来指导将现有热流测量值外推到此类测量很少或不存在的区域的方法。对于地球上任何选定的空间点，该过程都会生成热流值的直方图，该直方图是根据从与目标点结构相似的区域获得的现有测量值确定的。推断的直方图基于“结构相似性函数”，该函数被引入以量化不同区域之间的结构类比。我们使用Pollack等人的全球热流数据库在全球范围内应用此程序。 [Rev.地理学。 31（1993）267]指导了Shapiro和Ritzwoller地壳和最上地幔的3-D剪切速度模型的更新[Geophys。 J.国际51（2002）88]。该方法导致针对每个感兴趣的地理区域的热通量的推断概率分布。这些分布是严格的非高斯分布，但可以通过对数逻辑分布很好地近似，该对数逻辑分布完全由两个参数指定。推断的分布与在多个位置区域300 km半径的圆中观察到的热通量分布非常吻合。特别要注意推断的整个南极表面热通量分布，那里很少进行直接测量，但可能需要有关热流的信息以帮助了解南极冰盖和冰流的动力学。预计南极西部的平均热流将比南极东部的热流高近三倍，并且变化更大。高热量流动可能会影响南极西部冰流的动力学以及南极冰原的稳定性。

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