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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Deep Ice Stratigraphy and Basal Conditions in Central West Antarctica Revealed by Coherent Radar
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Deep Ice Stratigraphy and Basal Conditions in Central West Antarctica Revealed by Coherent Radar

机译：相干雷达揭示的南极中西部深层冰地层和基础条件

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摘要

We discuss results from a high-sensitivity, multichannel, very high frequency, and surface-based radar depth sounder/imager. The instrument was used to map deep internal layers and characterize basal conditions over a 240- km2 grid in the vicinity of the West Antarctic Ice Sheet Divide ice core site. The ice thickness at the core site was found to be about 3470 m, and we detected internal layers to within 350 m of the ice/bed interface. Radar-detected layer stratigraphy does not show evidence of flow-induced disturbances that might complicate the depth-age relationship and the interpretation of climate history preserved in the ice. We also found that bed reflectivity over the region varies by more than 30 dB. Approximately 15 dB of this variability appears to be the result of transitions from a frozen to a thawed bed in a number of places. The remainder probably results from changes in bed roughness. Our data are important for planning drilling to the bed, as well as providing constraints and boundary conditions for regional ice-flow models.
机译：我们讨论了来自高灵敏度，多通道，非常高频率和基于地面的雷达测深仪/成像仪的结果。该仪器被用来绘制深南内层的图景，并在西极南极冰盖分隔冰心地点附近的240平方公里网格上表征基础条件。发现核心部位的冰厚度约为3470 m，我们检测到了位于冰/床界面350 m以内的内层。雷达探测到的地层学没有显示出由流动引起的扰动的证据，这些扰动可能会使深度-年龄关系和冰层中保存的气候历史的解释复杂化。我们还发现该区域的床反射率变化超过30 dB。这种变化的大约15 dB似乎是在许多地方从冷冻床转变为解冻床的结果。其余的可能是由于床面粗糙度的变化。我们的数据对于计划钻探基床以及为区域冰流模型提供约束和边界条件非常重要。

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