Shepherd Andrew, Gilbert Lin, Muir Alan S, Konrad Hannes, McMillan Malcolm, Slater Thomas, Briggs Kate H, Sundal Aud V, Hogg Anna E, Engdahl Marcus E
Centre for Polar Observation and Modelling, School of Earth and Environment University of Leeds Leeds UK.
Mullard Space Science Laboratory, Department of Space & Climate Physics University College London London UK.
Geophys Res Lett. 2019 Jul 28;46(14):8174-8183. doi: 10.1029/2019GL082182. Epub 2019 Jul 24.
Fluctuations in Antarctic Ice Sheet elevation and mass occur over a variety of time scales, owing to changes in snowfall and ice flow. Here we disentangle these signals by combining 25 years of satellite radar altimeter observations and a regional climate model. From these measurements, patterns of change that are strongly associated with glaciological events emerge. While the majority of the ice sheet has remained stable, 24% of West Antarctica is now in a state of dynamical imbalance. Thinning of the Pine Island and Thwaites glacier basins reaches 122 m in places, and their rates of ice loss are now five times greater than at the start of our survey. By partitioning elevation changes into areas of snow and ice variability, we estimate that East and West Antarctica have contributed -1.1 ± 0.4 and +5.7 ± 0.8 mm to global sea level between 1992 and 2017.
由于降雪和冰流的变化，南极冰盖高度和质量的波动在各种时间尺度上都会发生。在这里，我们通过结合25年的卫星雷达高度计观测数据和一个区域气候模型来解析这些信号。从这些测量中，出现了与冰川学事件密切相关的变化模式。虽然大部分冰盖保持稳定，但南极西部24%的区域目前处于动态失衡状态。松岛和思韦茨冰川盆地的变薄在某些地方达到了122米，它们的冰流失速度现在是我们调查开始时的五倍。通过将海拔变化划分为积雪和冰变化区域，我们估计在1992年至2017年期间，东南极洲和西南极洲对全球海平面的贡献分别为-1.1±0.4毫米和+5.7±0.8毫米。
