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首页> 外文期刊>Geochemistry, geophysics, geosystems >Potential groundwater and heterogeneous heat source contributions to ice sheet dynamics in critical submarine basins of East Antarctica
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Potential groundwater and heterogeneous heat source contributions to ice sheet dynamics in critical submarine basins of East Antarctica

机译：南极东部关键海底盆地潜在的地下水和非均质热源对冰盖动力学的贡献

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摘要

We present the results of two numerical models describing contributions of groundwater and heterogeneous heat sources to ice dynamics directly relevant to basal processes in East Antarctica. A two-phase, one-dimensional hydrothermal model demonstrates the importance of groundwater flow in vertical heat flux advection near the ice-bed interface. Typical, conservative vertical components of groundwater volume fluxes (from either topographical gradients or vertically channeled flow) on the order of 1-10 mm/yr can alter vertical heat flux by 50-500 mW/m(2) given parameters typical for the interior of East Antarctica. This heat flux has the potential to produce considerable volumes of meltwater depending on basin geometry and geothermal heat production. A one-dimensional hydromechanical model demonstrates that groundwater is mainly recharged into saturated, partially poroelastic (i.e., vertical stress only; not coupled to a deformation equation) sedimentary aquifers during ice advance. During ice retreat, groundwater discharges into the ice-bed interface, which may contribute to water budgets on the order of 0.1-1 mm/yr. We also present an estimated map of potentially heterogeneous heat flow provinces using radiogenic heat production data from East Antarctica and southern Australia, calculated sedimentary basin depths, and radar-derived bed roughness. These are overlaid together to delineate the areas of greatest potential effect from these modeled processes on the ice sheet dynamics of the East Antarctic Ice Sheet.
机译：我们介绍了两个数值模型的结果，这些模型描述了地下水和非均质热源对与南极东部基础过程直接相关的冰动力学的贡献。一个两阶段的一维热液模型表明了地下水流在冰床界面附近的垂直热流平流中的重要性。在给定内部典型参数的情况下，地下水体积通量的典型，保守的垂直分量（来自地形梯度或垂直通道流）约为1-10 mm /年，可以使垂直热通量改变50-500 mW / m（2）。南极洲。根据盆地的几何形状和地热的产生，这种热通量有可能产生大量的融化水。一维水力力学模型表明，冰前进过程中主要将地下水补给到饱和的，部分多孔的（即仅垂直应力;不与变形方程耦合的）沉积含水层中。在退冰期间，地下水会排入冰床界面，这可能会导致每年0.1-1 mm的水预算。我们还使用来自南极东部和澳大利亚南部的放射状生热数据，计算出的沉积盆地深度和雷达衍生的地层粗糙度，提供了一个潜在的异构热流省的估计图。这些叠加在一起，以描绘出这些建模过程对南极东部冰原动力学的最大潜在影响区域。

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