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Explaining mass balance and retreat dichotomies at Taku and Lemon Creek Glaciers, Alaska
Journal of Glaciology ( IF 3.4 ) Pub Date : 2020-04-14 , DOI: 10.1017/jog.2020.22
Christopher McNeil , Shad O'Neel , Michael Loso , Mauri Pelto , Louis Sass , Emily H. Baker , Seth Campbell

We reanalyzed mass balance records at Taku and Lemon Creek Glaciers to better understand the relative roles of hypsometry, local climate and dynamics as mass balance drivers. Over the 1946–2018 period, the cumulative mass balances diverged. Tidewater Taku Glacier advanced and gained mass at an average rate of +0.25 ± 0.28 m w.e. a–1, contrasting with retreat and mass loss of −0.60 ± 0.15 m w.e. a−1 at land-terminating Lemon Creek Glacier. The uniform influence of regional climate is demonstrated by strong correlations among annual mass balance and climate data. Regional warming trends forced similar statistically significant decreases in surface mass balance after 1989: −0.83 m w.e. a–1 at Taku Glacier and −0.81 m w.e. a–1 at Lemon Creek Glacier. Divergence in cumulative mass balance arises from differences in glacier hypsometry and local climate. Since 2013 negative mass balance and glacier-wide thinning prevailed at Taku Glacier. These changes initiated terminus retreat, which could increase dramatically if calving begins. The future mass balance trajectory of Taku Glacier hinges on dynamics, likely ending the historic dichotomy between these glaciers.

中文翻译:

解释阿拉斯加 Taku 和 Lemon Creek 冰川的质量平衡和撤退二分法

我们重新分析了 Taku 和 Lemon Creek 冰川的质量平衡记录,以更好地了解高度测量、当地气候和动态作为质量平衡驱动因素的相对作用。在 1946-2018 年期间,累积质量平衡出现了分歧。Tidewater Taku Glacier 以平均 +0.25 ± 0.28 m 的速度前进并增加质量–1,与 -0.60 ± 0.15 m 的后退和质量损失相比,我们-1在陆地终止柠檬溪冰川。年度质量平衡和气候数据之间的强相关性证明了区域气候的统一影响。区域变暖趋势迫使 1989 年后地表质量平衡出现类似的统计显着下降:-0.83 m we a–1在 Taku Glacier 和 -0.81 m 我们–1在柠檬溪冰川。累积质量平衡的差异源于冰川高度测量和当地气候的差异。自 2013 年以来,大沽冰川出现了负质量平衡和冰川范围的减薄。这些变化引发了终点撤退,如果开始产犊,这可能会急剧增加。大沽冰川未来的质量平衡轨迹取决于动力学,可能会结束这些冰川之间的历史二分法。
更新日期:2020-04-14
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