ABSTRACT Geodetic volume estimates of Storglaciären in Sweden suggest a 28% loss in total ice mass between 1910 and 2015. Terrestrial photographs from 1910 of Tarfala valley, where Storglaciären is situated, allow for an accurate reconstruction of the glacier's surface using Structure-from-Motion photogrammetry, which we used for past volume and mass estimations. The glacier's yearly mass balance gradient and net mass balance was also estimated back to 1880 using weather data from Karesuando, 170 km north-east of Storglaciären, through neural network regression. These combined reconstructions provide a continuous mass change series between the end of the Little Ice Age and 1946, when field data become available. The resultant reconstruction suggests a state close to equilibrium between 1880 and the 1910s, followed by drastic melt until the 1970s, constituting 76% of the 1910–2015 ice loss. More favourable conditions subsequently stabilized the mass balance until the late 1990s, after which Storglaciären started losing mass again. The 1910 reconstruction allows for a more accurate mass change series than previous estimates, and the methodology can be used on other glaciers where early photographic material exists.

中文翻译：

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使用瑞典 Storglaciären 的历史运动摄影测量法约束 135 年的质量平衡

摘要 瑞典 Storglaciären 的大地测量体积估计表明，1910 年至 2015 年间，总冰量减少了 28%。1910 年 Storglaciären 所在的 Tarfala 山谷的陆地照片允许使用 Structure-from-Motion 准确重建冰川表面摄影测量，我们用于过去的体积和质量估计。使用 Storglaciären 东北 170 公里的 Karesuando 的天气数据，通过神经网络回归，还估计了 1880 年以来冰川的年度质量平衡梯度和净质量平衡。当现场数据可用时，这些组合重建提供了小冰河时代结束和 1946 年之间的连续质量变化序列。由此产生的重建表明在 1880 和 1910 年代之间接近平衡的状态，随后是剧烈融化，直到 1970 年代，占 1910-2015 年冰损失的 76%。更有利的条件随后稳定了质量平衡，直到 1990 年代后期，此后 Storglaciären 再次开始失去质量。1910 年的重建允许比以前的估计更准确的质量变化系列，并且该方法可用于存在早期摄影材料的其他冰川。