当前位置: X-MOL 学术Geomorphology › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mass balance and surface evolution of the debris-covered Miage Glacier, 1990 - 2018
Geomorphology ( IF 3.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.geomorph.2020.107474
A.M. Stefaniak , B.A. Robson , S.J. Cook , B. Clutterbuck , N.G. Midgley , J.C. Labadz

Abstract Many glaciers in high-mountain regions exhibit a debris cover that moderates their response to climatic change compared to clean-ice glaciers. Studies that integrate long-term observations of debris-covered glacier mass balance, velocity, surface debris evolution and geomorphological changes (such as ponds and ice cliffs) are relatively few. This study used satellite imagery, ground-based photogrammetry and bathymetry to assess such changes at Miage Glacier, Italian Alps, over a 28-year time period (1990 – 2018). Over this period, Miage Glacier experienced sustained negative mass balance (-0.86 ± 0.27 metres per year water equivalent [m w.e. a-1]), a substantial reduction in surface velocity (-46%), and increased debris-cover extent (+8.5% of the total glacier area). Since 1990, supraglacial ponds and ice cliffs have become more prevalent; whilst only covering 1.2 – 1.5% of the glacier area, they account for up to 8 times the magnitude of the average glacier surface lowering. Subsequently, Miage Glacier has entered a phase of enhanced decay since 1990. Miage Glacier is expected to continue to slow and thin, although any further accelerations in its decay will depend upon whether or not the tributary glaciers become disconnected from the main trunk, which would reduce ice flow, promote stagnation, flatten the longitudinal profile, and facilitate more widespread development of supraglacial ponds and so enhance ablation.

中文翻译:

1990 年至 2018 年被碎片覆盖的 Miage 冰川的质量平衡和表面演化

摘要 与清洁冰川相比,高山地区的许多冰川表现出碎片覆盖,缓和了它们对气候变化的反应。综合长期观测碎片覆盖的冰川质量平衡、速度、地表碎片演化和地貌变化(如池塘和冰崖)的研究相对较少。本研究使用卫星图像、地面摄影测量和水深测量来评估意大利阿尔卑斯山 Miage Glacier 在 28 年期间(1990 年至 2018 年)的此类变化。在此期间,Miage Glacier 经历了持续的负质量平衡(-0.86 ± 0.27 米/年水当量 [m we a-1]),表面速度大幅降低(-46%),碎片覆盖范围增加(+冰川总面积的 8.5%)。自 1990 年以来,冰上池塘和冰崖变得更加普遍;虽然仅占冰川面积的 1.2 - 1.5%,但它们占冰川表面平均下降幅度的 8 倍。随后,米格冰川自 1990 年以来进入了一个加速衰减的阶段。 米格冰川预计将继续减慢和变薄,尽管其衰减的任何进一步加速将取决于支流冰川是否与主干断开,这将导致减少冰流,促进停滞,拉平纵向剖面,促进冰上池塘更广泛的发展,从而加强消融。
更新日期:2021-01-01
down
wechat
bug