Importance of seasonal and annual layers in controlling backscatter to radar altimeters across the percolation zone of an ice sheet
Importance of seasonal and annual layers in controlling backscatter to radar altimeters across the percolation zone of an ice sheet
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季节性和年度层在控制冰盖渗透区雷达高度计反向散射方面的重要性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Wingham
中科院分区：
文献类型：
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作者：
Julian B. T. Scott;P. Nienow;D. Mair;V. Parry;E. Morris;D. Wingham
雷达高度计是测量南极和格陵兰冰盖以及较大冰盖海拔变化的主要工具之一。2004年秋和2006年春在格陵兰冰盖渗漏区部署了一台陆基雷达。该雷达是一个工作在Ku波段的高带宽系统，与几个卫星高度计的频率相同。测量是在海拔1795米到2350米的范围内进行的，同时进行了积雪坑和浅层岩心研究。这些测量显示了后向散射的空间和时间变化。地面反射和体积反射的相对强度在春季和秋季之间变化很大，而且整个渗流区也有很高的空间变异性。渗流的程度将影响雷达高度计所作的海拔估计。
Radar altimeters are one of the main tools for measuring elevation changes across the Antarctic and Greenland ice sheets and larger ice caps. A ground‐based radar was deployed in autumn 2004 and spring 2006 in the percolation zone of the Greenland Ice Sheet. This radar is a high bandwidth system operating in the Ku band, the same frequency as several satellite altimeters. Measurements were made over an elevation range of 1795 to 2350 m, along with snow pit and shallow core studies. These measurements demonstrate the spatial and temporal variations in the backscatter. Relative strengths of surface and volume reflections change dramatically between spring and autumn and there is also high spatial variability across the percolation zone. The extent of percolation will affect elevation estimates made by radar altimeters.