The observed acceleration of ice shelf basal melt rates throughout West Antarctica could destabilize continental ice sheets and markedly increase global sea level. Explanations for decadal-scale melt intensification have focused on processes local to shelf seas surrounding the ice shelves. A suite of process-based model experiments, guided by CMIP6 forcing scenarios, show that freshwater forcing from the Antarctic Peninsula, propagated between marginal seas by a coastal boundary current, causes enhanced melting throughout West Antarctica. The freshwater anomaly stratifies the ocean in front of the ice shelves and modifies vertical and lateral heat fluxes, enhancing heat transport into ice shelf cavities and increasing basal melt. Increased glacial runoff at the Antarctic Peninsula, one of the first signatures of a warming climate in Antarctica, emerges as a key trigger for increased ice shelf melt rates in the Amundsen and Bellingshausen Seas.

中文翻译：

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南极半岛变暖引发整个南极洲西部的基础融化率提高

观察到的整个南极洲西部冰架基础融化速率的加速可能会破坏大陆冰盖并显着增加全球海平面。对十年尺度融化强化的解释主要集中在冰架周围陆架海的局部过程上。由 CMIP6 强迫情景指导的一套基于过程的模型实验表明，来自南极半岛的淡水强迫通过沿海边界流在边缘海之间传播，导致整个南极洲西部的融化加剧。淡水异常使冰架前的海洋分层，改变了垂直和横向的热通量，增强了进入冰架空腔的热量传输，增加了基底融化。南极半岛冰川径流增加，这是南极气候变暖的第一个迹象，