Aaron Cremona, M. Huss, J. Landmann, Joël Borner, D. Farinotti
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引用次数: 4
摘要
摘要在过去的几十年里,人们观察到冰川融化速度在加快。特别是在预计未来会加剧的热浪期间,会发生大量的冰损失。由于在日常尺度上测量和模拟冰川物质平衡仍然具有挑战性,短期的物质平衡变化,包括极端的融化事件,很难被捕捉到。在这里,我们提出了一种基于计算机视觉技术的新方法,用于自动确定局部尺度上的每日质量平衡变化。该方法基于对相机图像中彩色胶带消融桩的自动识别,并于2019-2022年夏季在三个阿尔卑斯冰川上安装的六个站点进行了测试和验证。我们的方法产生的每日质量平衡的不确定度为±0.81 cm w.e。d−1,大约是视觉读数准确度的一半。将6个站点自动获取的每日质量平衡与过去10年的平均每日质量平衡进行比较,这些平衡是由季节性现场观测得出的,以检测和评估极端融化事件。这样就可以分析2022年夏季热浪对冰川融化的影响。结果表明,23 d为极端融化期,热浪周期与极端融化事件具有较强的对应关系。低于平均水平的冬季降雪量和一系列夏季热浪的结合导致了前所未有的冰川质量损失。据估计,2022年热浪出现的25 d期间,瑞士全境的冰川储水量变化为1.27±0.10 km3,相当于该夏季冰川总损失量的35%。同样25天的热浪造成的冰川质量损失相当于2010-2020年夏季整个融化季节平均质量损失的56%,这表明热浪与季节性融化的相关性。
European heat waves 2022: contribution to extreme glacier melt in Switzerland inferred from automated ablation readings
Abstract. Accelerating glacier melt rates were observed during the last decades. Substantial ice loss occurs particularly during heat waves that are expected to intensify in the future. Because measuring and modelling glacier mass balance on a daily scale remains challenging, short-term mass balance variations, including extreme melt events, are poorly captured. Here, we present a novel approach based on computer-vision techniques for automatically determining daily mass balance variations at the local scale. The approach is based on the automated recognition of colour-taped ablation stakes from camera images and is tested and validated at six stations installed on three Alpine glaciers during the summers of 2019–2022. Our approach produces daily mass balance with an uncertainty of ±0.81 cm w.e. d−1, which is about half of the accuracy obtained from visual readouts. The automatically retrieved daily mass balances at the six sites were compared to average daily mass balances over the last decade derived from seasonal in situ observations to detect and assess extreme melt events. This allows analysing the impact that the summer heat waves which occurred in 2022 had on glacier melt. Our results indicate 23 d with extreme melt, showing a strong correspondence between the heat wave periods and extreme melt events. The combination of below-average winter snowfall and a suite of summer heat waves led to unprecedented glacier mass loss. The Switzerland-wide glacier storage change during the 25 d of heat waves in 2022 is estimated as 1.27 ± 0.10 km3 of water, corresponding to 35 % of the overall glacier mass loss during that summer. The same 25 d of heat waves caused a glacier mass loss that corresponds to 56 % of the average mass loss experienced over the entire melt season during the summers 2010–2020, demonstrating the relevance of heat waves for seasonal melt.
期刊介绍:
The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies.
The main subject areas are the following:
ice sheets and glaciers;
planetary ice bodies;
permafrost and seasonally frozen ground;
seasonal snow cover;
sea ice;
river and lake ice;
remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.