New radar altimeters have supported elevation modeling with greater accuracy and extended periods in recent years. Sentinel-3 has been rarely used in previous studies for monitoring the Antarctic ice sheet. The CryoSat-2 and Sentinel-3 satellite radar altimeter data were combined to extract the elevation changes in the Antarctic ice sheet. First, a subregional data filtering method based on a clustering algorithm was proposed to improve the accuracy of the elevation change results for the outliers in the original measurements. Next, an improved model-fitting model that incorporated multiple parameters was used to extract elevation changes, and the results were validated using airborne laser altimetry data and ICESat-2 data. The average changes in the Antarctic ice sheet elevation from 2016 to 2019 were −4.3 ± 0.9 cm / y. The elevation changes of the ice shelf edges with large slopes and complex topography were much larger than the interior. Some specific areas showed substantial elevation changes. The most significant surface decreases occurred at the Pine Island Glacier and the Totten Glacier, while a pronounced surface heightening existed at the Kamb Ice Stream. We reveal an effective method for combining Antarctic ice sheet data from new radar altimeters. This method supports the long-term monitoring of the Antarctic ice sheet and global climate change in the future.

中文翻译：

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CryoSat-2和Sentinel-3雷达高度计提取和分析南极冰盖高程变化

近年来，新的雷达高度计以更高的精度和更长的周期支持高程建模。Sentinel-3 在以前的研究中很少用于监测南极冰盖。结合 CryoSat-2 和 Sentinel-3 卫星雷达高度计数据，提取南极冰盖的海拔变化。首先，为了提高原始测量中异常值高程变化结果的准确性，提出了一种基于聚类算法的次区域数据过滤方法。接下来，使用包含多个参数的改进模型拟合模型来提取高程变化，并使用机载激光测高数据和 ICESat-2 数据验证结果。2016年至2019年南极冰盖海拔的平均变化为-4.3±0.9 cm / y。坡度大、地形复杂的冰架边缘海拔变化远大于内部。一些特定区域显示出显着的海拔变化。最显着的地表减少发生在 Pine Island Glacier 和 Totten Glacier，而在 Kamb Ice Stream 存在明显的地表升高。我们揭示了一种结合来自新雷达高度计的南极冰盖数据的有效方法。该方法支持未来对南极冰盖和全球气候变化的长期监测。而坎布冰流则存在明显的地表升高。我们揭示了一种结合来自新雷达高度计的南极冰盖数据的有效方法。该方法支持未来对南极冰盖和全球气候变化的长期监测。而坎布冰流则存在明显的地表升高。我们揭示了一种结合来自新雷达高度计的南极冰盖数据的有效方法。该方法支持未来对南极冰盖和全球气候变化的长期监测。