Ice shelf basal melt rate estimation in a Lagrangian framework

We present a dense record of glacier ice dynamics and ice melt rate at the boundary between grounded ice and ocean - or grounding line - of Petermann Glacier, a major outlet glacier in Northwest Greenland. The traditional view of grounding lines implemented in physical models in charge of projecting sea level rise is a fixed grounding line with zero ice melt. Instead, the satellite record reveals kilometer-size grounding line migrations - or grounding zones - during tidal cycles, with preferential intrusions of 6 km along pre-existing subglacial channels. The highest melt rates of ice are recorded within the grounding zone. Kilometer-wide grounding zone with vigorous ice-ocean interaction will make projections of sea level rise from glaciers potentially double., , This dataset supplements the manuscript \"Melt rates in the kilometer-size grounding zone of Petermann Glacier, Greenland before and during a retreat.\" by Ciracì, E., Rignot, E., Scheuchl, B., Tolpekin, V., Wollersheim, M., An, L., Milillo, P., Bueso-Bello, J. L., Rizzoli, P., Dini, L., 2023 - in press in The Proceedings of the National Academy of Sciences (PNAS).我们呈现了格陵兰西北部主要出口冰川——彼得曼冰川（Petermann Glacier）的接地冰（grounded ice）与海洋交界界面（即接地线（grounding line））处的高密度冰川冰动力学及冰融化速率观测数据集。 以往用于海平面上升预测的物理模型中，所采用的接地线传统范式为固定不动且冰融化速率为零的界面。然而卫星观测数据显示，在潮汐周期内，接地线会发生千米级的迁移并形成接地带（grounding zone）；冰体沿预先存在的冰下河道发生选择性侵入，侵入距离可达6公里。 接地带内观测到了最高的冰融化速率。这种宽度达千米、伴随强烈冰-海相互作用的接地带，可能会使冰川贡献的海平面上升预测结果翻倍。 本数据集为Ciracì, E.、Rignot, E.、Scheuchl, B.、Tolpekin, V.、Wollersheim, M.、An, L.、Milillo, P.、Bueso-Bello, J. L.、Rizzoli, P.、Dini, L.等于2023年完成的论文《格陵兰彼得曼冰川千米级接地带退移前后的冰融化速率》提供了补充数据，该论文已被《美国国家科学院院刊》（Proceedings of the National Academy of Sciences，PNAS）录用待刊。