Trends in Antarctic Ice Sheet Elevation and Mass.
Trends in Antarctic Ice Sheet Elevation and Mass.
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DOI：
10.1029/2019gl082182
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发表时间：
2019-07-28
影响因子：
5.2
通讯作者：
Engdahl, Marcus E.
中科院分区：
文献类型：
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作者：
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.
由于降雪和冰流的变化，南极冰盖的海拔和质量会在不同的时间尺度上发生波动。在这里，我们结合 25 年的卫星雷达高度计观测和区域气候模型来理清这些信号。从这些测量中，出现了与冰川事件密切相关的变化模式。虽然大部分冰盖保持稳定，但南极洲西部 24% 的地区目前处于动态失衡状态。派恩岛 (Pine Island) 和思韦茨 (Thwaites) 冰川盆地部分地区的减薄程度达到 122 m，其冰损失率现在是我们调查开始时的五倍。通过将海拔变化划分为冰雪变化区域，我们估计 1992 年至 2017 年间，东南极洲和西南极洲对全球海平面的贡献为 -1.1 ± 0.4 和 +5.7 ± 0.8 毫米。我们结合卫星雷达测高和区域气候模型，将南极洲海拔变化分解为冰雪变化贡献。1992 年至 2017 年间，冰变薄的范围扩大到包括西南极洲的 24%。南极洲和达 122 m 的地方 Pine Island 和 Thwaites 冰川的冰损失增加了五倍；东南极洲和西南极洲对海平面的影响为 4.6 ± 1.2 毫米
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. We combine satellite radar altimetry and a regional climate model to separate changes in Antarctic elevation into snow and ice contributions Between 1992 and 2017, ice thinning has grown in extent to include 24% of West Antarctica and reaches 122 m in places Ice losses from Pine Island and Thwaites Glaciers have risen fivefold; East and West Antarctica have contributed 4.6 ± 1.2 mm to sea level