Charrassin Raphaelle, Millan Romain, Rignot Eric, Scheinert Mirko
Department Earth System Science, University of California Irvine, Irvine, CA, 92697, USA.
Université Grenoble Alpes, CNRS, IRD, INP, 38400, Grenoble, Isère, France.
Sci Rep. 2025 Jan 7;15(1):1214. doi: 10.1038/s41598-024-81599-1.
Bathymetry critically influences the intrusion of warm Circumpolar Deep Water onto the continental shelf and under ice shelf cavities in Antarctica, thereby forcing ice melting, grounding line retreat, and sea level rise. We present a novel and comprehensive bathymetry of Antarctica that includes all ice shelf cavities and previously unmeasured continental shelf areas. The new bathymetry is based on a 3D inversion of a circumpolar compilation of gravity anomalies constrained by measurements from the International Bathymetric Chart of the Southern Ocean, BedMachine Antarctica, and discrete seafloor measurements from seismic and ocean robotic probes. Previously unknown troughs with thicker ice shelf cavities are revealed in many parts of Antarctica, especially East Antarctica. The greater depths of troughs on the continental shelf and ice shelf cavities imply that many glaciers are more vulnerable to ocean subsurface warming than previously thought, which may increase the projections of sea level rise from Antarctica.
海底地形对温暖的环极深层水侵入南极大陆架以及冰架腔下方起着关键作用，从而导致冰融化、接地线后退和海平面上升。我们展示了一幅全新且全面的南极海底地形图，其中包括所有冰架腔以及此前未测量的大陆架区域。这幅新的海底地形图基于对环极重力异常汇编数据的三维反演，这些数据受到《南大洋国际测深图》、《南极床层机器图》的测量结果以及地震和海洋机器人探测器的离散海底测量数据的约束。在南极洲的许多地区，尤其是东南极洲，发现了此前未知的、冰架腔更厚的海槽。大陆架和冰架腔海槽的深度更大，这意味着许多冰川比之前认为的更容易受到海洋次表层变暖的影响，这可能会增加对南极海平面上升的预测。
