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

• Main Authors: Pelle, Tyler, Morlighem, Mathieu, Seroussi, Helene, Nakayama, Yoshihiro
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Antarc*; Antarctic; Antarctica; East Antarctica; Ice Sheet; Ice Shelf; Totten Glacier
• Online Access: https://doi.org/10.7280/D1KD7C

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 (-0.5-1 o C) 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 21 st 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 ...