Mass loss from the Antarctic Ice Sheet is dominated by ice dynamics, where ocean-driven melt leads to un-buttressing and ice flow acceleration. Long-term ice speed change has been measured in Antarctica over the past four decades; however, there are limited observations of short-term seasonal speed variability on the grounded ice sheet. Here we assess seasonal variations in ice flow speed on 105 glaciers on the west Antarctic Peninsula using Sentinel-1 satellite observations spanning 2014 to 2021. We find an average summer speed-up of 12.4 ± 4.2%, with maximum speed change of up to 22.3 ± 3.2% on glaciers with the most pronounced seasonality. Our results show that over the six-year study period, glaciers on the west Antarctic Peninsula respond to seasonal forcing in the ice–ocean–atmosphere system, indicating sensitivity to changes in terminus position, surface melt plus rainwater flux, and ocean temperature. Seasonal speed variations must be accounted for when measuring the mass balance and sea level contribution of the Antarctic Peninsula, and studies must establish the future evolution of this previously undocumented signal under climate warming scenarios.

南极冰原的质量损失主要受冰动力学的影响，其中海洋驱动的融化导致不支撑和冰流加速。在过去的四十年里，南极洲测量了长期的冰速变化；然而，对接地冰盖上短期季节性速度变化的观察有限。在这里，我们使用 2014 年至 2021 年的 Sentinel-1 卫星观测评估了南极半岛西部 105 个冰川冰流速度的季节性变化。我们发现夏季平均加速为 12.4 ± 4.2%，最大速度变化高达 22.3季节性最明显的冰川为 ± 3.2%。我们的结果表明，在六年的研究期间，南极半岛西部的冰川对冰-海洋-大气系统中的季节性强迫作出反应，表明对终点位置、地表融化加雨水通量和海洋温度变化的敏感性。在测量南极半岛的质量平衡和海平面贡献时，必须考虑季节性速度变化，并且研究必须确定这种以前未记录的信号在气候变暖情景下的未来演变。