Current behaviour and dynamics of the lowermost italian glacier (montasio occidentale, julian alps)
Current behaviour and dynamics of the lowermost italian glacier (montasio occidentale, julian alps)
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意大利最低冰川（蒙塔西奥西冰川，朱利安阿尔卑斯山）的当前行为和动态
DOI：
10.1111/geoa.12002
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
P. Tarolli
中科院分区：
文献类型：
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作者：
L. Carturan;G. Baldassi;A. Bondesan;Simone Calligaro;A. Carton;F. Cazorzi;G. D. Fontana;R. Francese;A. Guarnieri;N. Milan;D. Moro;P. Tarolli
摘要 较小的冰川（<0.5 km2）对环境变化反应迅速，并且通常表现出个体响应的较大分散性。鉴于这些冰体数量众多且对山区冰川面积总损失的贡献较大，因此考虑这些冰体对于评估区域冰川变化至关重要。然而，使用传统技术研究小冰川可能很困难或不可行，并且评估其当前的活动和动态可能存在问题。在本文中，我们提出了一种综合方法，将地貌学、地球物理和高分辨率大地测量与地面激光扫描仪相结合，来表征大连低海拔地区小型雪崩冰川的当前行为。冰川仍然活跃，并显示出可检测到的从堆积区域到下部消融区域的质量转移，该区域被厚厚的碎片地幔覆盖。冰川的存在归功于当地的地形气候条件，高大的岩壁确保了冰川的存在，这些岩壁通过提供雪崩来增强积雪，并通过提供地形阴影和调节冰川流域的碎片预算来减少消融。在过去的几年里，与欧洲大部分冰川相比，该冰川表现出奇特的行为，尽管有温暖的消融季节，但仍接近平衡条件。自小冰河时代最大值以来，也发生了比例较小的相对变化。与大多数其他高山冰川相比，我们推断该冰川对气温的敏感性较低，对降水的敏感性较高，这与不利时期碎片覆盖增加的重要反馈有关。
Abstract Smaller glaciers (<0.5 km2) react quickly to environmental changes and typically show a large scatter in their individual response. Accounting for these ice bodies is essential for assessing regional glacier change, given their high number and contribution to the total loss of glacier area in mountain regions. However, studying small glaciers using traditional techniques may be difficult or not feasible, and assessing their current activity and dynamics may be problematic. In this paper, we present an integrated approach for characterizing the current behaviour of a small, avalanche‐fed glacier at low altitude in the talian lps, combining geomorphological, geophysical and high‐resolution geodetic surveying with a terrestrial laser scanner. The glacier is still active and shows a detectable mass transfer from the accumulation area to the lower ablation area, which is covered by a thick debris mantle. The glacier owes its existence to the local topo‐climatic conditions, ensured by high rock walls which enhance accumulation by delivering avalanche snow and reduce ablation by providing topographic shading and regulating the debris budget of the glacier catchment. In the last several years the glacier has displayed peculiar behaviour compared with most glaciers of the uropean lps, being close to equilibrium conditions in spite of warm ablation seasons. Proportionally small relative changes have also occurred since the Little Ice Age maximum. Compared with the majority of other Alpine glaciers, we infer for this glacier a lower sensitivity to air temperature and a higher sensitivity to precipitation, associated with important feedback from increasing debris cover during unfavourable periods.