Cambio de área glaciar en el volcán Maipo (Andes Centrales), una aproximación morfométrica: 4 décadas de registros satelitales

IF 0.9 4区地球科学 Q3 GEOLOGY

Andean Geology Pub Date : 2021-11-22 DOI:10.5027/andgeov49n1-3369

Andrés Lo Vecchio Repetto, M. Candela, Daniel Falaschi, Federico Otero, María Alejandrina Videla, M. G. Lenzano, Andrés Rivera

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引用次数: 0

Abstract

Current climatic conditions in Central Andes (CA) (31-36 °S) have triggered the reduction of glacier area. Although CA are geographically circumscribed to an area under the same macroclimatic domain, their rugged topography creates several topoclimates as response to the effects of elevation, slope and aspect (morphometric factors). This study explores the impact of morphometric factors on the evolution of the glacial surface located above of Maipo volcano (34°09'50''S; 69°49'53''W). Through the use of 11 LANDSAT images (MSS, TM and OLI), the spatio-temporal evolution (period 1976-2020) of the glacier area was reconstructed. On this period, glacier area was reduced by 6 ± 0.5 km2 (-0.14 ± 0.01 km2a-1), equal to 63 % of 1976 glacial area (9.6 ± 0.5 km2). Fifty percent of the reduction occurred between 3,900 and 4,000 m elevation, with absolute losses towards lower elevations. In addition, it was detected that for every 100 m of ascent the relative area loss rate decreased 0.1 %a-1 (R2 = 0.81; p-value

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迈波火山(安第斯山脉中部)冰川面积的变化，形态测量方法:40年的卫星记录

安第斯山脉中部（31-36°S）目前的气候条件引发了冰川面积的减少。尽管CA在地理上局限于同一大气候域下的一个区域，但其崎岖的地形会产生多种地形气候，以应对海拔、坡度和坡向（形态测量因素）的影响。本研究探讨了地貌测量因素对麦坡火山（34°09'50'S；69°49'53'S）上方冰川表面演化的影响。通过使用11幅陆地卫星图像（MSS、TM和OLI），重建了冰川区的时空演化（1976-2020年）。在此期间，冰川面积减少了6±0.5 km2（-0.14±0.01 km2a-1），相当于1976年冰川面积（9.6±0.5 km2）的63%。50%的减少发生在海拔3900米至4000米之间，绝对损失发生在海拔较低的地方。此外，检测到，每上升100米，相对面积损失率下降0.1%a-1（R2=0.81；p值

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来源期刊

Andean Geology 地学-地质学

CiteScore

3.90

自引率

0.00%

发文量

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.