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Quantifying C-band scattering mechanisms from snow-covered first-year sea ice at the winter-spring transition

机译:量化冬春过渡期积雪覆盖的第一年海冰的C波段散射机制

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We present model and measurement results for time-series C-band normalized radar cross-sections (NRCS) over first-year snow-covered sea ice during a winter-spring transition period. Experimental scatterometer and physical data were collected near Cambridge Bay, Nunavut, Canada between May 20 and May 28, 2014 covering a severe storm event on May 25. We observed good agreement between model and experimental HH and VV NRCS. Before the storm, the large-scale surface scattering and volume scattering components dominated. After the storm, the large-scale scattering contribution increased, while the volume scattering contribution considerably dropped. Surface scattering from the small-scale component of the air-snow interface became significant at high incidence angles. We attribute these effects to the increase in surface roughness and snow moisture content during the post-storm period. Our results provide a physical basis for interpretation of time-series SAR images over sea ice at the winter-spring transition.
机译:我们提供了冬春季过渡期第一年积雪覆盖的海冰上的时间序列C波段归一化雷达横截面(NRCS)的模型和测量结果。 2014年5月20日至5月28日,在加拿大努纳武特的剑桥湾附近收集了实验性散射仪和物理数据,涵盖了5月25日的一次严重风暴事件。暴风雨来临之前,大规模的表面散射和体积散射成分占主导地位。暴风雨过后,大型散射贡献增加,而体积散射贡献大大下降。在高入射角下,来自雪-雪界面的小尺度成分的表面散射变得很明显。我们将这些影响归因于风暴后时期表面粗糙度和雪中水分含量的增加。我们的结果为解释冬春季过渡时海冰上的时间序列SAR图像提供了物理基础。

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