Radio-Echo Sounding: Reflections From Internal Layers In Ice Sheets
Radio-Echo Sounding: Reflections From Internal Layers In Ice Sheets
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DOI：
10.3189/s002214300002147x
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发表时间：
1977
影响因子：
3.4
通讯作者：
J. W. Clough
中科院分区：
文献类型：
--
作者：
J. W. Clough
摘要 无线电回波内部反射的起源和性质是很多争论的主题。对冰盖中介电变化的单层和多层反射系数的计算表明，观察到的反射强度可能是由许多薄层的反射引起的，但薄层区域最好通过用具有平均介电特性的单个较厚层替换该区域来近似。对密度变化、灰尘和污垢带以及 ε 各向异性的反射的计算表明，密度变化是冰盖最上面一公里内部分层的最可能原因。南极洲“伯德”站的内部反射深度与在该位置深孔中测量的冰的物理特性的比较支持了这一结论。
Abstract The origin and nature of radio-echo internal reflections is the subject of much debate. Calculations of single- and multiple-layer reflection coefficients for dielectric changes in the ice sheet indicate that the observed reflection strength may result from reflections from many thin layers but the zone of thin layers may best be approximated by replacing the zone with a single thicker layer with average dielectric properties. Calculation of reflections from density changes, dust and dirt bands and anisotropy of ϵ indicate density variations as the most likely cause of the internal layering in the uppermost kilometer of ice sheets. Comparison of the depth of internal reflections at “Byrd” station, Antarctica, with the physical properties of the ice measured in a deep core hole at that location support this conclusion.