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）主要的冰体排泄通道，其蕴含的海平面上升当量冰量（sea level rise equivalent ice mass, SLRe）达3.85米，且至少自21世纪初以来就呈现出海洋驱动的动态变化。我们采用完全耦合的冰-海洋模式，以耦合模式比较计划第六阶段（CMIP6）预估的温度、盐度和流速异常作为海洋边界强迫条件，对托滕冰川到2100年的演化过程进行了预估。与以往研究结论一致，在未来模拟试验中，南极坡流（Antarctic Slope Current）仍将持续调控暖水向托滕冰川的涌入路径。温度介于-0.5℃至1℃的暖水，通过冰架东缘的凹陷区域进入托滕冰川的冰下腔，驱动其东部接地带发生持续后退——这一过程无法在非耦合模式中被捕捉。在高排放情景下，暖水将突破地形屏障，并于2070年左右脱离托滕冰川的南部接地带，使接地冰损失速率提升3.5倍（从10吉吨/年（Gt/yr）增至35吉吨/年（Gt/yr）），到2100年时累计造成等效海平面上升4.20毫米的冰量损失（SLRe）。本数据集出版物配套《地球物理研究通讯》（Geophysical Research Letters）2021年刊发的论文2021GL093213："Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21st century"，涵盖所有耦合与非耦合冰盖模式结果，以及初始状态冰盖模式结果。此外，本数据集包含依据CMIP6低、高排放情景，应用于北、东、西三个海洋边界的温度、盐度和流速平均变化率场。我们还提供了所有耦合试验的初始海洋模式状态及2070年的典型海洋模式输出结果，一份详细说明海洋模式设置与网格的海洋模式数据文件，以及海洋模式地形数据和初始冰架吃水文件。最后，本数据集包含所有耦合试验的南极坡流平均强度时间序列，以及用于实现冰盖与海洋模式耦合的脚本。需要说明的是，由于相关文件的数量与体量过大，我们并未提供全部海洋模式输出结果；但现有公开数据已足够复现论文中的所有图表，并完成模式耦合过程的重现。