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Spatially and temporally resolved ice loss in High Mountain Asia and the Gulf of Alaska observed by CryoSat-2 swath altimetry between 2010 and 2019

机译:在2010年至2019年间,在高山亚洲和高山亚洲的海湾和阿拉斯加海湾的空间和暂时解决的冰损失

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Glaciers are currently the largest contributor to sea level rise after ocean thermal expansion, contributing 30% to the sea level budget. Global monitoring of these regions remains a challenging task since global estimates rely on a variety of observations and models to achieve the required spatial and temporal coverage, and significant differences remain between current estimates. Here we report the first application of a novel approach to retrieve spatially resolved elevation and mass change from radar altimetry over entire mountain glaciers areas. We apply interferometric swath altimetry to CryoSat-2 data acquired between 2010 and 2019 over High Mountain Asia(HMA) and in the Gulf of Alaska (GoA). In addition, we exploit CryoSat s monthly temporal repeat to reveal seasonal and multiannual variation in rates of glaciers thinning at unprecedented spatial detail.We find that during this period, HMA and GoA have lost an average of-28:0-3.0 Gt yr-1 (-0:29-0.03mw.e. yr-1) and-76:3-5.7 Gt yr-1 (-0:89-0.07mw.e. yr-1), respectively, corresponding to a contribution to sea level rise of 0.078-0.008mmyr-1 (0.051-0.006mmyr-1 from exorheic basins) and 0.21 l-0.016mmyr-1. The cumulative loss during the 9-year period is equivalent to 4.2% and 4.3% of the ice volume, respectively, for HMA and GoA. Glacier thinning is ubiquitous except for in the Karakoram Kunlun region, which experiences stable or slightly positive mass balance. In the GoA region, the intensity of thinning varies spatially and temporally, with acceleration of mass loss from-0:06-0.33 to-1:1 -0.06myr-1 from 2013, which correlates with the strength of the Pacific Decadal Oscillation. In HMA ice loss is sustained until 2015 2016, with a slight decrease in mass loss from 2016, with some evidence of mass gain locally from 2016 2017 onwards.
机译:冰川目前是海洋热膨胀后海拔地区最大的贡献者,促进海平面预算的30%。全球监测这些地区仍然是一个具有挑战性的任务,因为全球估计依赖于各种观察和模型来实现所需的空间和时间覆盖率,并且在当前估计之间仍然存在显着差异。在这里,我们报告了一种新颖的方法来从整个山地冰川地区从雷达​​高度测定的空间解决的高度和质量变化的第一次应用。我们将干涉速率施用到2010年至2019年在高山亚洲(HMA)和阿拉斯加湾(GOA)之间获得的Cryosat-2数据。此外,我们剥削了低温的月度时间重复,揭示了在前所未有的空间细节下稀释的季节性和多年来的变化。我们发现在此期间,HMA和果阿平均损失了-28:0-3.0 GT YR- 1(-0:29-0.03mw.e.e-1)和-76:3-5.7 gt YR-1(-0:89-0.07mw.e.yr-1),对应于贡献海平面上升0.078-0.008mmyr-1(来自Exorheic Basins的0.051-0.006mmy-1)和0.21L-0.016mmγ1。 9年期间的累积损失分别相当于冰量的4.2%和4.3%,适用于HMA和GOA。除了在喀喇昆仑昆仑地区进行玻璃稀土,除了在喀喇昆仑地区,其经历稳定或略微正质量平衡。在果阿地区,减薄的强度在空间和时间上变化,从2013年从-0:06-0.33到-1:1 -0.06myr-1的大量损失加速,与太平洋二等振荡的强度相关。在HMA冰损失是持续到2015年2016年,2016年的大规模损失略有下降,从2016年从2017年开始批量获利的证据。

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    《Oceanographic Literature Review》 |2021年第5期|1141-1142|共2页
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