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首页> 外文期刊>Frontiers in Digital Humanities >Seasonal Variations in Ice-Front Position Controlled by Frontal Ablation at Glaciar Perito Moreno, the Southern Patagonia Icefield
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Seasonal Variations in Ice-Front Position Controlled by Frontal Ablation at Glaciar Perito Moreno, the Southern Patagonia Icefield

机译:南部巴塔哥尼亚冰原冰川消融控制下的冰锋位置的季节性变化

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摘要

The front position of calving glaciers is controlled by ice speed and frontal ablation which consists of the two processes of calving and subaqueous melting. However, the relative importance of these processes in frontal variation is difficult to assess and poorly understood, particularly for freshwater calving glaciers. To better understand the mechanism of seasonal variations involved in the ice front variations of freshwater calving glaciers, we measured front position, ice surface speed, air temperature, and proglacial lakewater temperature of Glaciar Perito Moreno in Patagonia. No substantial fluctuations in front position and ice speed occurred during the 15-year period studied (1999a??2013), despite a warming trend in air temperature (0.059a?|C aa??1). Seasonal variations were observed both in the ice-front position (±50 m) and ice speed (±15%). The frontal ablation rate, computed from the frontal displacement rate and the ice speed, varied in a seasonal manner with an amplitude approximately five times greater than that in the ice speed. The frontal ablation correlated well with seasonal lakewater temperature variations (r = 0.96) rather than with air temperature (r = 0.86). Our findings indicate that the seasonal ice front variations of Glaciar Perito Moreno are primarily due to frontal ablation, which is controlled through subaqueous melting by the thermal conditions of the lake.
机译:产犊冰川的前部位置受制冰速度和额叶消融控制,后者由产犊和水下融化两个过程组成。但是,这些过程在额叶变化中的相对重要性很难评估并且了解甚少,尤其是对于淡水产犊冰川而言。为了更好地了解淡水产犊冰川的冰锋变化所涉及的季节性变化机制,我们测量了巴塔哥尼亚Glaciar Perito Moreno的锋线位置,冰面速度,空气温度和湖面湖水温度。尽管气温升高(0.059a?| C aa ?? 1),但在研究的15年期间(1999a至2013年),前部位置和冰速没有发生实质性波动。在冰前位置(±50 m)和冰速(±15%)均观察到季节性变化。由额叶位移率和冰速计算出的额叶消融率以季节性方式变化,其幅度大约比冰速大五倍。额叶消融与季节性湖水温度变化(r = 0.96)而不是空气温度(r = 0.86)密切相关。我们的发现表明,Glaciar Perito Moreno的季节性冰锋变化主要归因于额叶消融,额叶消融是由湖泊的热状况通过水下融化来控制的。

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