Subsurface Radar Sounding of the South Polar Layered Deposits of Mars
Subsurface Radar Sounding of the South Polar Layered Deposits of Mars
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DOI：
10.1126/science.1139672
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发表时间：
2007-04
期刊：
影响因子：
56.9
通讯作者：
J. Plaut;G. Picardi;A. Safaeinili;A. Ivanov;S. Milkovich;A. Cicchetti;Wlodek Kofman;J. Mouginot;W. Farrell;R. Phillips;S. Clifford;A. Frigeri;R. Orosei;C. Federico;I. Williams;D. Gurnett;E. Nielsen;T. Hagfors;E. Heggy;E. Stofan;D. Plettemeier;T. Watters;C. Leuschen;P. Edenhofer
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文献类型：
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作者：
J. Plaut;G. Picardi;A. Safaeinili;A. Ivanov;S. Milkovich;A. Cicchetti;Wlodek Kofman;J. Mouginot;W. Farrell;R. Phillips;S. Clifford;A. Frigeri;R. Orosei;C. Federico;I. Williams;D. Gurnett;E. Nielsen;T. Hagfors;E. Heggy;E. Stofan;D. Plettemeier;T. Watters;C. Leuschen;P. Edenhofer
火星快车轨道飞行器上的火星高级地下和电离层探测雷达探测了火星南极富含冰的层状沉积物。雷达信号穿透到矿床深处（超过3.7公里）。对于大部分区域，在与沉积物和基底之间的界面一致的时间延迟处检测到反射。从这个界面反射的能量表明信号的衰减很小，这表明它是由几乎纯净的水冰组成的。绘制了基底界面地形图和层状沉积物厚度图。在距北极300公里的范围内可以看到一组埋藏的洼地。厚度图显示了矿床和异常厚度区域的不对称分布。总体积估计为1.6 × 106立方千米，相当于全球约11米厚的水层。
The ice-rich south polar layered deposits of Mars were probed with the Mars Advanced Radar for Subsurface and Ionospheric Sounding on the Mars Express orbiter. The radar signals penetrate deep into the deposits (more than 3.7 kilometers). For most of the area, a reflection is detected at a time delay that is consistent with an interface between the deposits and the substrate. The reflected power from this interface indicates minimal attenuation of the signal, suggesting a composition of nearly pure water ice. Maps were generated of the topography of the basal interface and the thickness of the layered deposits. A set of buried depressions is seen within 300 kilometers of the pole. The thickness map shows an asymmetric distribution of the deposits and regions of anomalous thickness. The total volume is estimated to be 1.6 × 106 cubic kilometers, which is equivalent to a global water layer approximately 11 meters thick.