Fluctuaciones recientes del glaciar Alerce (1953-2020), Andes de Patagonia norte

IF 0.9 4区 地球科学 Q3 GEOLOGY
Juan Cruz Ghilardi Truffa, L. Ruíz, Pierre Pitte, Lautaro Clavero
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引用次数: 0

Abstract

In recent decades, glacier retreat has been observed in all the world’s mountain ranges. Over the last 20 years, glaciers in the Andes have lost mass at one of the highest rates on record. Particularly, glaciers in the northern Patagonian Andes show the highest rate of loss of all the Andean regions for the last decade. Detailed records of long-term variations in glacier extent are crucial to put current climate change into context and quantify its impact on mountain areas. In the present study, a reconstruction of the extension (length and area) of the Alerce glacier (41.15° S-71.81° W) for the last 70 years was carried out. By means of historical documents and satellite images (Landsat and Pléiades), detailed maps of glacier fluctuations were generated for the period 1953-2020. Four methodologies were evaluated to measure the front position: i) central flow line; ii) curvilinear box; iii) multiline; and iv) variable box. The magnitude of the front position variations depends on the methodology applied. The method that best addresses glacier front variations over the period analyzed is the variable box method. Between 1953 and 2020, the Alerce glacier lost 35% of its area (1.1±0.1 km2) and 67% of its total length (1.49±0.04 km). It is possible to distinguish periods with different rates of retreat. A stage of slight retreat (-11.3±0.5 ma-1) between 1953 and 1976, followed by a period of stability (-6.7±0.5 ma-1) between 1977 and 1983, then a strong retreat (-58.7±0.5 ma-1) between 1984 and 1999, followed by another period of stability (-5.4±0.5 ma-1) between 2000 and 2009 and, finally, another retreat (-8.7±0.5 ma-1) between 2010 and 2020. The retreat rates for the Alerce glacier mimic those observed in other glaciers in the region, possibly representing a regional climatic signal.
巴塔哥尼亚安第斯山脉北部 Alerce 冰川近期的波动(1953-2020 年)。
近几十年来,世界上所有山脉都出现了冰川退缩现象。在过去 20 年里,安第斯山脉冰川的消减速度是有记录以来最高的。特别是巴塔哥尼亚安第斯山脉北部的冰川,在过去十年中的流失率是所有安第斯山脉地区中最高的。详细记录冰川范围的长期变化对于了解当前气候变化的背景以及量化气候变化对山区的影响至关重要。在本研究中,对过去 70 年中阿尔塞斯冰川(南纬 41.15 度-西经 71.81 度)的延伸(长度和面积)进行了重建。通过历史文献和卫星图像(Landsat 和 Pléiades),绘制了 1953-2020 年期间冰川波动的详细地图。对四种测量前沿位置的方法进行了评估:i) 中心流线;ii) 曲线箱;iii) 多流线;iv) 可变箱。前沿位置变化的幅度取决于所采用的方法。在分析期间,最能体现冰川前沿变化的方法是可变方框法。从 1953 年到 2020 年,阿尔塞斯冰川面积减少了 35%(1.1±0.1 平方公里),总长度减少了 67%(1.49±0.04 公里)。可以区分出不同退缩速度的时期。1953 年至 1976 年为轻微后退阶段(-11.3±0.5 ma-1),1977 年至 1983 年为稳定阶段(-6.7±0.5 ma-1),1984 年至 1999 年为强烈后退阶段(-58.7±0.5 ma-1),2000 年至 2009 年为另一稳定阶段(-5.4±0.5 ma-1),2010 年至 2020 年为再次后退阶段(-8.7±0.5 ma-1)。阿尔塞斯冰川的退缩率与该地区其他冰川的退缩率相似,可能代表了一种区域气候信号。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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