The density–depth relationship of the Antarctic ice sheet is important for establishing a high-precision surface mass balance model and predicting future ice-sheet contributions to global sea levels. A new algorithm is used to reconstruct firn density and densification rate by inverting monostatic radio wave echoes from ground-operated frequency-modulated continuous wave radar data collected near four ice cores along the transect from Zhongshan Station to Dome A. The inverted density profile is consistent with the core data within 5.54% root mean square error. Due to snow redistribution, the densification rate within 88 km of ice core DT401 is correlated with the accumulation rate and varies greatly over horizontal distances of <5 km. That is, the depth at which a critical density of 830 kg m−3 is reached decreases and densification rate increases in high-accumulation regions but decreases in low-accumulation regions. This inversion technique can be used to analyse more Antarctic radar data and obtain the density distribution trend, which can improve the accuracy of mass-balance estimations.

中文翻译：

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使用调频连续波雷达反演南极洲东部 Dome A 的密度-深度剖面

南极冰盖的密度-深度关系对于建立高精度的地表质量平衡模型和预测未来冰盖对全球海平面的贡献具有重要意义。采用一种新的算法，通过从中山站到圆顶A的样带附近四个冰芯附近采集的地面操作调频连续波雷达数据的单基地无线电波回波反演来重建冰层密度和致密化率。反演的密度剖面是一致的核心数据均方根误差在 5.54% 以内。由于雪的重新分布，冰芯 DT401 88 km 内的致密化率与堆积率相关，并且在小于 5 km 的水平距离上变化很大。即，临界密度为 830 kg m 的深度-3在高聚积区达到的致密化率降低，致密化率增加，而在低聚积区则降低。这种反演技术可用于分析更多的南极雷达数据，获得密度分布趋势，从而提高质量平衡估计的准确性。