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首页> 外文期刊>Journal of South American earth sciences >Recent glacier variations on active ice capped volcanoes in the Southern Volcanic Zone (37°-46°S), Chilean Andes
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Recent glacier variations on active ice capped volcanoes in the Southern Volcanic Zone (37°-46°S), Chilean Andes

机译：智利安第斯山脉南部火山区（37°-46°S）活跃的冰封火山近期的冰川变化

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摘要

Glaciers in the southern province of the Southern Volcanic Zone (SVZ) of Chile (37-46°S) have experi-enced significant frontal retreats and area losses in recent decades which have been primarily triggered by tropospheric warming and precipitation decrease. The resulting altitudinal increase of the Equilibrium Line Altitude or ELA of glaciers has lead to varied responses to climate, although the predominant vol-canic stratocone morphologies prevent drastic changes in their Accumulation Area Ratios or AAR. Superimposed on climate changes however, glacier variations have been influenced by frequent eruptive activity. Explosive eruptions of ice capped volcanoes have the strongest potential to destroy glaciers, with the most intense activity in historical times being recorded at Nevados de Chilian, Villarrica and Hudson. The total glacier area located on top of the 26 active volcanoes in the study area is ca. 500 km~2. Glacier areal reductions ranged from a minimum of -0.07 km~2 a ~(-1) at Mentolat, a volcano with one of the smallest ice caps, up to a maximum of -1.16 km~2 a~(-1) at Volcan Hudson. Extreme and contrasting glacier-volcano interactions are summarised with the cases ranging from the abnormal ice frontal ad-vances at Michinmahuida, following the Chaitin eruption in 2008, to the rapid melting of the Hudson intracaldera ice following its plinian eruption of 1991. The net effect of climate changes and volcanic activity are negative mass balances, ice thinning and glacier area shrinkage. This paper summarizes the glacier changes on selected volcanoes within the region, and discusses climatic versus volcanic induced changes. This is crucial in a volcanic country like Chile due to the hazards imposed by lahars and other volcanic processes.
机译：智利南部火山区（SVZ）南部省份（37-46°S）的冰川最近几十年经历了重大的前部撤退和面积损失，这主要是由对流层变暖和降水减少引起的。尽管主要的火山平流圆锥形态阻止了其积雪面积比或AAR的急剧变化，但冰川的平衡线高度或ELA的垂直升高导致了对气候的不同反应。然而，由于气候变化，冰川变化受到频繁爆发活动的影响。封盖冰山的火山爆发具有最强的破坏冰川的潜力，内华达斯-德-奇利安，比利亚里卡和哈德森有史以来最激烈的活动。位于研究区域内26座活火山顶部的冰川总面积约为。 500公里〜2。冰川面积减少的范围从最小的冰盖之一的门托拉特火山的最低-0.07 km〜2 a〜（-1）到最高的沃尔康的最大-1.16 km〜2 a〜（-1）哈德森。总结了极端和相反的冰川-火山相互作用，其案例包括2008年Chaitin爆发后Michinmahuida的异常冰锋前移，1991年plinian爆发后哈德森火山口内冰块的快速融化。净效应气候变化和火山活动造成负质量平衡，冰层变薄和冰川面积缩小。本文总结了该区域内选定火山的冰川变化，并讨论了气候与火山诱发的变化。由于火山口和其他火山爆发过程带来的危害，这对于像智利这样的火山国家至关重要。

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