Area changes of glaciers on active volcanoes in Latin America between 1986 and 2015 observed from multi-temporal satellite imagery
Area changes of glaciers on active volcanoes in Latin America between 1986 and 2015 observed from multi-temporal satellite imagery
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DOI：
10.1017/jog.2019.30
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发表时间：
2019-05
影响因子：
3.4
通讯作者：
Johannes Reinthaler;F. Paul;H. D. Granados;A. Rivera;C. Huggel
中科院分区：
文献类型：
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作者：
Johannes Reinthaler;F. Paul;H. D. Granados;A. Rivera;C. Huggel
摘要活火山上的冰川易受气候波动和火山活动的影响。虽然许多研究分析了个别火山的变化，但这项研究首次比较了大陆范围内活火山的冰川变化。在1986年、1999年和2015年左右，使用半自动波段比率方法结合使用Landsat 4/5/7/8和Sentinel-2卫星图像进行手动编辑，绘制了拉丁美洲59座火山的冰川面积。将面积变化与史密森尼火山数据库进行了比较，以分析可能的冰川-火山相互作用。在整个时期内，测绘面积从1399.3 ± 80平方公里变为1016.1 ± 34平方公里（-383.2平方公里），相对变化率为-27.4%（-0.92% a-1）。小型冰川，特别是热带地区的小型冰川，与大型和热带外冰川相比，损失了更多的面积。有趣的是，在59个被分析的冰川中，有46个（78%）在第二个时期表现出减速的收缩率（1999年之前为-1.20%，1999年之后为-0.70%）。我们发现，火山爆发时冰川的面积损失率（-1.03% a-1）略高于没有火山爆发时的（-0.86% a-1）。
ABSTRACT Glaciers on active volcanoes are subject to changes in both climate fluctuations and volcanic activity. Whereas many studies analysed changes on individual volcanoes, this study presents for the first time a comparison of glacier changes on active volcanoes on a continental scale. Glacier areas were mapped for 59 volcanoes across Latin America around 1986, 1999 and 2015 using a semi-automated band ratio method combined with manual editing using satellite images from Landsat 4/5/7/8 and Sentinel-2. Area changes were compared with the Smithsonian volcano database to analyse possible glacier–volcano interactions. Over the full period, the mapped area changed from 1399.3 ± 80 km2 to 1016.1 ± 34 km2 (−383.2 km2) or −27.4% (−0.92% a−1) in relative terms. Small glaciers, especially in tropical regions lost more of their area compared to large and extra–tropical glaciers. Interestingly, 46 out of 59 analysed glaciers (78%) showed a decelerating shrinkage rate in the second period (−1.20% a−1 before 1999 and −0.70% a−1 after 1999). We found a slightly higher (but statistically not significant) area loss rate (−1.03% a−1) for glaciers on volcanoes with eruptions than without (−0.86% a−1).