论文标题
雷达在火星上的冰川液态水的证据
Radar evidence of subglacial liquid water on Mars
论文作者
论文摘要
长期以来怀疑但未观察到火星极盖的底部存在液态水。我们使用火星高级雷达进行了澳元地区的调查，以进行地下和电离层响起，这是火星Express航天器上的低频雷达。在2012年5月至2015年12月之间收集的雷达轮廓包含被困在南极分层沉积物冰下的液态水的证据。在一个定义明确的20公里宽的区域中，以193°E，81°S为中心，周围有明亮的地下反射，被反射区域较少。对雷达信号的定量分析表明，这种明亮的特征具有较高的介电介电常数> 15，与水材料相匹配。我们将此功能解释为火星上稳定的液体水体。
The presence of liquid water at the base of the Martian polar caps has long been suspected but not observed. We surveyed the Planum Australe region using the Mars Advanced Radar for Subsurface and Ionosphere Sounding, a low-frequency radar on the Mars Express spacecraft. Radar profiles collected between May 2012 and December 2015, contain evidence of liquid water trapped below the ice of the South Polar Layered Deposits. Anomalously bright subsurface reflections were found within a well-defined, 20km wide zone centered at 193°E, 81°S, surrounded by much less reflective areas. Quantitative analysis of the radar signals shows that this bright feature has high dielectric permittivity >15, matching water-bearing materials. We interpret this feature as a stable body of liquid water on Mars.
