500–2000-MHz Brightness Temperature Spectra of the Northwestern Greenland Ice Sheet
500–2000-MHz Brightness Temperature Spectra of the Northwestern Greenland Ice Sheet
复制标题
格陵兰岛西北部冰盖的 500–2000 MHz 亮度温度光谱
DOI：
10.1109/tgrs.2017.2764381
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发表时间：
2018
影响因子：
8.2
通讯作者：
M. Aksoy
中科院分区：
文献类型：
--
作者：
K. Jezek;J. Johnson;Shurun Tan;L. Tsang;M. Andrews;M. Brogioni;G. Macelloni;M. Durand;Chi;Domenic J. Belgiovane;Yuna Duan;C. Yardim;Hongkun Li;A. Bringer;V. Leuski;M. Aksoy
超宽带辐射计已被开发出来，用于测量冰冻圈（包括冰盖和海冰）的地下特性。该辐射计使用 12 个通道测量 0.5 至 2 GHz 的亮度温度光谱，每个通道在约 88 MHz 带宽上测量场景亮度温度，并解析为 0.24 MHz 间隔。该仪器于 2016 年 9 月飞越格陵兰岛西北部，获得了冰盖和沿海地区首个宽带低频亮温谱。结果揭示了强烈的空间和光谱变化，这些变化与飞行路径沿途遇到的表面物理特性密切相关，飞行路径始于海洋，然后经过海岸附近的岩石，然后到达内部冰盖的消融、潮湿、渗透和干雪区域。特别是，通过改变雪恩上部水平密度层和孤立冰体的分布，观察到并合理地解释了渗透和干雪区域的强烈光谱响应。该仪器的机载部署以及随后限制未受保护频段中射频干扰的算法的成功推动了持续的机载调查以及对星载仪器可行性的研究。
An ultra-wideband radiometer has been developed to measure subsurface properties of the cryosphere including ice sheets and sea ice. The radiometer measures brightness temperature spectra from 0.5 to 2 GHz using 12 channels, each of which measures scene brightness temperatures over an ~88-MHz bandwidth resolved into 0.24-MHz intervals. The instrument was flown over northwestern Greenland in September 2016 and acquired the first, wideband, low-frequency brightness temperature spectra over the ice sheet and coastal region. The results reveal strong spatial and spectral variations that correlate well with the physical properties of the surface encountered along the flight path, which started over ocean, then passed the rock near the coast, and then up onto the ablation, wet, percolation, and dry snow zones of the interior ice sheet. In particular, strong spectral responses in percolation and dry snow zones are observed and plausibly explained by varying the distribution of horizontal density layers and isolated icy bodies in the upper portion of the firn. The success of the airborne deployment of the instrument and subsequent implementation of algorithms to limit radio frequency interference in unprotected bands is motivating continued airborne investigations as well as stimulating research into the feasibility of a spaceborne instrument.