Evidence for variable grounding-zone and shear-margin basal conditions across Thwaites Glacier, West Antarctica

Evidence for variable grounding-zone and shear-margin basal conditions across Thwaites Glacier, West Antarctica
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西南极洲思韦茨冰川可变接地区和剪切边缘基础条件的证据

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发表时间:
2016
期刊:
影响因子:
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通讯作者:
D. Blankenship
D. Blankenship
中科院分区:
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文献类型:
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作者:
D. Schroeder;C. Grima;D. Blankenship

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根据出口冰川接地带和剪切边缘下的雷达探测数据对冰盖基本条件进行明确的解释可能是有问题的,因为缺乏约束和空间可变的冰川衰减率以及通过粗糙冰面传播的损失。为了校正空间可变的衰减率,我们开发了一种新的雷达分析方法,通过沿从冰盖内部到接地带的雷达探测剖面拟合线性可变的衰减率,提供了改进的经验衰减校正。我们还通过使用表面回波幅度分布来限制表面反射和通过粗糙冰面的双向传播的相干功率的损失,对冰面传播损失进行了修正。通过将这种方法应用于西南极Thwaites冰川集水区的机载雷达探测,我们产生了相对反射率剖面,显示了不同地区地面带基本条件的变化。
ABSTRACTDefinitive interpretation of ice-sheet basal conditions from radar-sounding data beneath outlet-glacier grounding zones and shear margins can be problematic due to poorly constrained and spatially variable englacial attenuation rates and losses from propagation through a rough ice surface. To correct for spatially variable attenuation rates, we developed a novel radar analysis approach that provided improved empirical attenuation correction by fitting linearly variable attenuation rates along radar-sounding profiles from the ice-sheet interior to the grounding zone. We also corrected for ice-surface propagation losses by using surface echo amplitude distributions to constrain the loss of coherent power for surface reflections and two-way propagation through a rough ice surface. By applying this approach to airborne radar-sounding observations of the Thwaites Glacier catchment in West Antarctica, we produced relative reflectivity profiles, which show grounding-zone basal conditions varying across t...
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