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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier-Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements
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Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier-Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements

机译：通过结合Radarsat SAR干涉测量法和ICESat激光测高仪测量来分析Lambert冰川-美利坚冰架系统的速度场，质量平衡和基础融化

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摘要

By incorporating recently available remote sensing data, we investigated the mass balance for all individual tributary glacial basins of the Lambert Glacier-Amery Ice Shelf system, East Antarctica. On the basis of the ice flow information derived from SAR interferometry and ICESat laser altimetry, we have determined the spatial configuration of eight tributary drainage basins of the Lambert-Amery glacial system. By combining the coherence information from SAR interferometry and the texture information from SAR and MODIS images, we have interpreted and refined the grounding line position. We calculated ice volume flux of each tributary glacial basin based on the ice velocity field derived from Radarsat three-pass interferometry together with ice thickness data interpolated from Australian and Russian airborne radio echo sounding (RES) surveys and inferred from ICESat laser altimetry data. Our analysis reveals that three tributary basins have a significant net positive imbalance, while five other subbasins are slightly positive or close to zero balance. Overall, in contrast to previous studies, we find that the grounded ice in Lambert Glacier–Amery Ice Shelf system has a positive mass imbalance of 22.9 ± 4.4 Gt a~(-1). The net basal melting for the entire Amery Ice Shelf is estimated to be 27.0 ± 7.0 Gt a~(-1). The melting rate decreases rapidly from the grounding zone to the ice shelf front. Significant basal refreezing is detected in the downstream section of the ice shelf. The mass balance estimates for both the grounded ice sheet and the ice shelf mass differ substantially from other recent estimates.
机译：通过合并最近可用的遥感数据，我们研究了南极东部兰伯特冰川-艾美利冰架系统的所有单个支流冰川盆地的质量平衡。根据SAR干涉法和ICESat激光测高仪得出的冰流信息，我们确定了Lambert-Amery冰川系统的八个支流盆地的空间结构。通过结合来自SAR干涉测量的相干信息以及来自SAR和MODIS图像的纹理信息，我们已经解释并完善了接地线位置。我们根据从Radarsat三程干涉法得出的冰速场以及从澳大利亚和俄罗斯的机载无线电回波测深（RES）调查中插值并从ICESat激光测高仪数据推断出的冰厚数据，计算了每个支流冰川盆地的冰体积通量。我们的分析表明，三个支流盆地具有显着的净正失衡，而其他五个子流域则略微为正或接近于零。总体而言，与先前的研究相比，我们发现兰伯特冰川-阿美利冰架系统中的碎冰具有22.9±4.4 Gt a〜（-1）的正质量失衡。整个Amery冰架的净基础融化量估计为27.0±7.0 Gt a〜（-1）。从接地区到冰架前部，融化速率迅速降低。在冰架的下游部分检测到大量的基础冰冻。地面冰盖和冰架质量的质量平衡估算值与最近的其他估算值存在很大差异。

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