Despite long‐term analyses of lake ice phenology globally, comparatively little is known about high‐elevation lakes, for which climate shifts are thought to be occurring faster than at lower elevations. Using a 36‐yr dataset (1983–2018) on alpine lakes (> 3000 m ASL) from the Green Lakes Valley, Colorado (GLV), we found that ice‐cover duration decreased by an average of ~ 24 d, due to both earlier ice‐off (9 d) and especially later ice‐on (15 d). Spring ice thickness also decreased by 0.88 cm yr⁻¹. By comparison, ice‐cover duration in the GLV is decreasing ~ 50% faster than for Northern Hemisphere lakes (n = 215), which translates to an increase in open water duration ~ 2.5 times more in the GLV than the average of the Northern Hemisphere. Our analytical comparison demonstrated more rapid trends in this alpine region compared to lakes more broadly, and especially emphasized the influence of elevation on lake ice phenology.

中文翻译：

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在薄冰上：将湖泊冰盖的海拔高度与长期损失联系起来

尽管对全球湖泊冰物候学进行了长期分析，但对高海拔湖泊知之甚少，据认为，高海拔湖泊的气候变化发生速度比低海拔湖泊要快。使用来自科罗拉多州格林湖谷（GLV）的高山湖泊（> 3000 m ASL）的36年数据集（1983-2018），我们发现冰盖持续时间平均缩短了约24 d，这是因为早冰（9 d），尤其是晚冰（15 d）。春季冰层厚度也减少了0.88 cm yr ^-1。相比之下，GLV的覆冰持续时间比北半球湖泊减少了约50％（n= 215），这意味着GLV的开放水域持续时间增加了〜比北半球的平均值多2.5倍。我们的分析比较表明，与更广泛的湖泊相比，该高山地区的趋势更为迅速，并且特别强调了海拔高度对湖泊冰物候的影响。