Radar mapping of Isunnguata Sermia, Greenland
Radar mapping of Isunnguata Sermia, Greenland
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格陵兰岛 Isunnguata Sermia 的雷达测绘
DOI：
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发表时间：
2013
期刊：
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通讯作者：
C. Leuschen
中科院分区：
文献类型：
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作者：
K. Jezek;Xiaolan Wu;J. Paden;C. Leuschen
冰厚度估计使用先进的最低点探测和层析成像雷达处理技术进行了比较，并结合在Isunnguata Sermia冰川，格陵兰岛的研究。使用一个合奏的操作冰桥飞行线间隔在500米的间隔和运行约沿着流动方向，我们发现有一个统计学上很好的比较冰下地形来自二维断层扫描和网格化的最低点探测。分析表明，层析成像数据更好地捕捉短波长（1-2公里）的模式在基础地形，但插值的最低点探测数据产生更广泛的空间和连续覆盖整个冰川，特别是在深冰下槽。使用派生的表面和基底地形图，我们发现，驱动应力和测量和模拟表面速度的比较表明，基底滑动是冰川运动的一个重要组成部分，但也只有弱耦合到详细的床地形保存的最深槽。正如人们对这个陆地终止、移动相对缓慢的冰川所预期的那样，冰下和冰前地形是相似的，这表明作用于现代冰川床的侵蚀过程曾经帮助塑造了现在暴露的陆地。
Ice thickness estimates using advanced nadir sounding and tomographic radar processing techniques are compared and combined in a study of Isunnguata Sermia glacier, Greenland. Using an ensemble of Operation IceBridge flight lines spaced at 500m intervals and running approximately along the flow direction, we find there is a statistically excellent comparison between subglacial terrains derived from two-dimensional tomography and gridded nadir sounding. Analysis shows that tomographic data better capture short wavelength (1–2 km) patterns in basal terrain, but interpolated nadir sounding data yield more spatially extensive and continuous coverage across the glacier, especially in deep subglacial troughs. Using derived surface and basal topography maps, we find that driving stress and measured and modeled surface velocity comparisons indicate that basal sliding is an important component of the glacier motion, but is also only weakly coupled to the detailed bed topography save for the deepest troughs. As might be expected for this land-terminating, relatively slow-moving glacier, the subglacial and proglacial topography is similar, suggesting the erosional processes acting on the modern glacier bed once helped sculpt the now exposed land.