Area changes of glaciers on active volcanoes in Latin America between 1986 and 2015 observed from multi-temporal satellite imagery
| Autor: | Hugo Delgado Granados, Andrés Rivera, Johannes Reinthaler, Christian Huggel, Frank Paul |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Glacier Shrinkage rate 010502 geochemistry & geophysics 01 natural sciences Volcano Period (geology) Satellite imagery Physical geography Band ratio Geology Loss rate 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of Glaciology. 65:542-556 |
| ISSN: | 1727-5652 0022-1430 |
| Popis: | 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 km2to 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−1before 1999 and −0.70% a−1after 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). |
| Databáze: | OpenAIRE |
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