Getz Ice Shelf, the largest producer of ice shelf meltwater in Antarctica, buttresses glaciers that hold enough ice to raise sea level by 22 cm. We present a new bathymetry of its sub‐ice shelf cavity using a three‐dimensional inversion of airborne gravity data constrained by multibeam bathymetry at sea and a reconstruction of the bedrock from mass conservation on land. The new bathymetry is deeper than previously estimated with differences exceeding 500 m in a number of regions. When incorporated into an ocean model, it yields a better description of the spatial distribution of ice shelf melt, specifically along glacier grounding lines. While the melt intensity is overestimated because of a positive bias in ocean thermal forcing, the study reveals the main pathways along which warm oceanic water enters the cavity and corroborates the observed rapid retreat of Berry Glacier along a deep channel with a retrograde bed slope.

中文翻译：

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使用重力衍生的测深法约束南极Getz冰架下的海洋模型

格茨冰架是南极洲最大的冰架融水生产商，支撑着冰川，冰川上的冰足以将海平面升高22厘米。我们通过对海上重力重力数据进行三维反演，并利用海上多波束测深法对海底重力进行了三维反演，并从陆地上的质量保护中重建了基岩，从而提出了其子冰架腔的新测深法。新的测深仪比以前估计的要深，在许多地区的差异超过500 m。将其纳入海洋模型后，可以更好地描述冰架融化的空间分布，特别是沿着冰川接地线。由于海洋热强迫的正偏差，高估了融化强度，