Data from: Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21st century

Totten Glacier, the primary ice discharger of East Antarctica, contains 3.85 m sea level rise equivalent ice mass (SLRe) and has displayed ocean-driven dynamic change since at least the early 2000s. We project Totten’s evolution through 2100 in a fully coupled ice-ocean model, forced at the ocean boundaries with anomalies in CMIP6 projected temperature, salinity, and velocity. Consistent with previous studies, the Antarctic Slope Current continues to modulate warm water inflow towards Totten in future simulations. Warm water (-0.5-1oC) accesses Totten’s sub-ice shelf cavity through depressions along the eastern ice front, driving sustained retreat of Totten’s eastern grounding zone that cannot be captured in uncoupled models. In high emission scenarios, warm water overcomes topographic barriers and dislodges Totten’s southern grounding zone around 2070, increasing the rate of grounded ice loss 3.5-fold (10 to 35 Gt/yr) and resulting in a total 4.20 mm SLRe loss by 2100. In this data publication, we present the model output and results associated with the Geophysical Research Letter's manuscript 2021GL093213: “Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21st century”. We include all coupled and uncoupled ice sheet model results and the initial-state ice sheet model. In addition, we include the temperature, salinity and velocity mean rate-of-change fields that were applied to the northern, eastern, and western ocean boundaries following CMIP6 low and high emission scenarios. We also include example ocean model output from the initial ocean model state and at 2070 for all coupled experiments, an ocean model data file that details the setup and grid of the ocean model, and the ocean model bathymetry and initial ice shelf draft files. Lastly, we include the time series of the mean strength of the Antarctic Slope Current for all couped experiments, as well as the script used to facilitate coupling between the ice sheet and ocean model. Please note that we do not include all ocean model output, as the number and size of the associated files is too large; however, the data available here is sufficient to reproduce all manuscript figures and recreate the model-coupling.托滕冰川（Totten Glacier）是东南极洲（East Antarctica）的主要冰体排放通道，其蕴含的冰量相当于3.85米海平面上升当量（SLRe），且至少自21世纪初以来便呈现出海洋驱动的动态演化特征。我们采用全耦合冰-海洋模式（fully coupled ice-ocean model），以耦合模式比较计划第六阶段（CMIP6）预估的温度、盐度与流速异常作为海洋边界强迫条件，对托滕冰川至2100年的演化过程进行了预估。与既往研究结论一致，在未来模拟试验中，南极坡流（Antarctic Slope Current）仍将持续调节暖水向托滕冰川的输入路径与规模。温度介于-0.5~1℃的暖水通过冰架东缘的凹陷区域进入托滕冰川的冰架下空腔（sub-ice shelf cavity），驱动其东部接地带（grounding zone）持续后退——这一过程无法在非耦合模式（uncoupled model）中被模拟重现。在高排放情景（high emission scenarios）下，暖水将在2070年左右突破地形屏障，使托滕冰川南部的接地带发生移位，将接地冰损失（grounded ice loss）速率提升至原来的3.5倍（10~35 Gt/yr），并在2100年时累计造成总计4.20毫米的海平面当量冰量损失。在本数据集发布内容中，我们提供了与《地球物理研究快报》（Geophysical Research Letter）刊发的稿件2021GL093213《21世纪东南极洲托滕冰川广泛接地线路后退》（"Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21st century"）相关的模式输出数据与研究结果。我们收录了所有耦合与非耦合冰盖模式（ice sheet model）结果，以及初始状态冰盖模式数据集。此外，我们还提供了依据CMIP6低、高排放情景，应用于北、东、西三面海洋边界的温度、盐度与流速平均变化率场数据。我们还包含了所有耦合试验的初始海洋模式状态及2070年的示例海洋模式输出数据，一份详细说明海洋模式设置与网格信息的海洋模式数据文件，以及海洋模式海底地形（bathymetry）与初始冰架吃水深度（ice shelf draft）文件。最后，我们提供了所有耦合试验中南极坡流平均强度的时间序列（time series）数据，以及用于实现冰盖与海洋模式间耦合的脚本文件。需要说明的是，由于相关文件的数量与体积过大，我们并未收录全部海洋模式输出数据；但现有公开数据集足以复现稿件中的所有图表，并完成冰-海洋耦合模式的完整重建工作。