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Parsing complex terrain controls on mountain glacier response to climate forcing
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.gloplacha.2020.103209
Caitlyn Florentine , Joel Harper , Daniel Fagre

Abstract Glaciers are a key indicator of changing climate in the high mountain landscape. Glacier variations across a mountain range are ultimately driven by regional climate forcing. However, changes also reflect local, topographically driven processes such as snow avalanching, snow wind-drifting, and radiation shading as well as the initial glacier conditions such as hypsometry and ice thickness. Here we assess the role of these various terrain influences on change to Little Ice Age (LIA) glaciers in Glacier National Park, U.S.A. With available data for LIA and modern glacier areas, we estimate glacier volumes using simple ice flow assumptions and topographically driven processes using terrain proxies. At the LIA glacial maxima there were 82 glaciers larger than 0.1 km2 ranging from 0.11 to 4.97 km2. Over the course of the 20th century, every single LIA glacier decreased in area and 60% (49 glaciers) diminished to below the 0.1 km2 threshold. Glaciers with large initial area (>1.5 km2) at the end of LIA persisted. Within the intermediate size class (0.5 km2

中文翻译:

解析山地冰川对气候强迫响应的复杂地形控制

摘要 冰川是高山景观中气候变化的关键指标。整个山脉的冰川变化最终是由区域气候强迫驱动的。然而,变化也反映了局部的、地形驱动的过程,如雪崩、雪风漂移和辐射阴影,以及初始冰川条件,如测厚仪和冰厚。在这里,我们评估了这些不同地形对美国冰川国家公园小冰河时代 (LIA) 冰川变化的影响。根据 LIA 和现代冰川区的可用数据,我们使用简单的冰流假设和地形驱动过程估计冰川体积地形代理。在 LIA 冰川最大值处,有 82 条冰川大于 0.1 平方公里,范围从 0.11 到 4.97 平方公里。在 20 世纪的过程中,每一个 LIA 冰川的面积都在减少,60%(49 条冰川)减少到 0.1 平方公里的阈值以下。LIA 末期初始面积较大(>1.5 平方公里)的冰川持续存在。中型(0.5 平方公里
更新日期:2020-08-01
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