Data for: Subglacial freshwater driven speedup of East Antarctic outlet glacier retreat

Recent studies have revealed the presence of a complex freshwater system underlying the Aurora Subglacial Basin (ASB), a region of East Antarctica that contains ~7 m of global sea level potential in ice mainly grounded below sea level. Yet, the impact that subglacial freshwater has on driving the evolution of the dynamic outlet glaciers that drain this basin has yet to be tested in a coupled ice sheet-subglacial hydrology numerical modeling framework. Here, we project the evolution of the primary outlet glaciers draining the ASB (Moscow University Ice Shelf, Totten, Vanderford, and Adams Glaciers) in response to an evolving subglacial hydrology system and to ocean forcing through 2100, following low and high CMIP6 emission scenarios. By 2100, ice-hydrology feedbacks enhance the ASB's 2100 sea level contribution by ~30% (7.50 mm to 9.80 mm) in high emission scenarios and accelerate retreat of Totten Glacier's main ice stream by 25 years. Ice-hydrology feedbacks are particularly influential in the retreat of the Vanderford and Adams Glaciers, driving an additional 10 km of retreat in fully-coupled simulations relative to uncoupled simulations. Hydrology-driven ice shelf melt enhancements are the primary cause of domain-wide mass loss in low emission scenarios, but are secondary to ice sheet frictional feedbacks under high emission scenarios. The results presented here demonstrate that ice-subglacial hydrology interactions can significantly accelerate retreat of dynamic Antarctic glaciers and that future Antarctic sea level assessments that do not take these interactions into account might be severely underestimating Antarctic Ice Sheet mass loss. In this data publication, we present the model output and results associated with the following manuscript recently submitted to the Journal of Geophysical Research: Earth Surface: "Subglacial discharge accelerates ocean driven retreat of Aurora Subglacial Basin outlet glaciers over the 21st century". We include yearly ice sheet model output between 2017-2100 for eight numerical ice-subglacial hydrology model runs. We also include the ice sheet and subglacial hydrology model initial states. In addition, we include all ocean forcing time-series (temperature and salinity for the low emission and high emission climate forcing scenarios for three glacial regions), which are used as input into the melt parameterization. Lastly, we include a MATLAB script that contains the code used to couple the ice-subglacial hydrology models as well as a "readme" file with further information on all data in this publication.

近期研究揭示，东南极洲极光冰下盆地（Aurora Subglacial Basin, ASB）下方存在复杂的冰下水文系统；该区域的冰体主要附着于海平面以下的基岩，若完全消融将带来约7米的全球海平面上升。然而，冰下淡水对驱动该盆地泄水动态出口冰川演化的影响，尚未在冰盖-冰下水文耦合数值模拟框架中得到验证。
本研究针对第六次耦合模式比较计划（Coupled Model Intercomparison Project Phase 6, CMIP6）的低、高两种排放情景，模拟了2100年前极光冰下盆地主要泄水出口冰川——莫斯科大学冰架、托滕冰川、范德福德冰川及亚当斯冰川——在冰下水文系统演化与海洋强迫共同作用下的演化过程。
至2100年时，在高排放情景下，冰-水文反馈将使极光冰下盆地的海平面贡献量提升约30%（从7.50毫米增至9.80毫米），并将托滕冰川主冰流的退缩时间提前25年。冰-水文反馈对范德福德冰川与亚当斯冰川的退缩过程影响尤为显著：在完全耦合模拟中，其退缩距离较非耦合模拟多10公里。
在低排放情景下，冰下径流驱动的冰架融水增强是全域质量损失的主要诱因；而在高排放情景下，该因素则次于冰盖摩擦反馈。本研究结果表明，冰盖-冰下水文相互作用可显著加速南极动态冰川的退缩，若未来南极海平面评估未纳入此类相互作用，可能会大幅低估南极冰盖的质量损失。
本数据集出版物附带已提交至《地球物理研究杂志：地球表面》（Journal of Geophysical Research: Earth Surface）的论文"Subglacial discharge accelerates ocean driven retreat of Aurora Subglacial Basin outlet glaciers over the 21st century"相关的模型输出与研究结果。本数据集包含2017至2100年间8组冰盖-冰下水文耦合数值模拟的逐年冰盖模型输出结果，同时包含冰盖与冰下水文模型的初始状态。此外，数据集还涵盖了用于融水参数化的三类冰川区域的低、高排放气候强迫情景下的海洋强迫时间序列（包括温度与盐度数据）。最后，本数据集附带用于耦合冰盖-冰下水文模型的MATLAB脚本，以及一份详述本出版物所有数据信息的自述文件。