Biblioteca Digital de VanguardiaResponse of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades
In this paper were investigated area variations in glaciers on Mount Melimoyu (44ºS, 72ºW) in the period of 1970-2017, and possible relationships with the climate variability between 1950 and 2017. Optical data from Sentinel-2A, and elevation from Digital Elevation Model (DEM) ASTER-GDEM v.2 and are...
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| Formato: | info:eu-repo/semantics/article |
| Lenguaje: | Portugués |
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Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas
2020
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| Acceso en línea: | https://www.revistas.usp.br/rdg/article/view/160197 http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/42347 |
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| author | Idalino, Filipe Daros Rosa, Kátia Kellem da Simões, Jefferson Cardia |
| author_facet | Idalino, Filipe Daros Rosa, Kátia Kellem da Simões, Jefferson Cardia |
| author_sort | Idalino, Filipe Daros |
| collection | Repositorio |
| description | In this paper were investigated area variations in glaciers on Mount Melimoyu (44ºS, 72ºW) in the period of 1970-2017, and possible relationships with the climate variability between 1950 and 2017. Optical data from Sentinel-2A, and elevation from Digital Elevation Model (DEM) ASTER-GDEM v.2 and area data from GLIMS inventory were used in GIS analyse. The temporal series of annual precipitation data by Explorador Climático - Chile, and temperature data of reanalysis from the University of Delaware were utilised for climate analysis. The glaciers area reduced from 80.97 km2 in 1970 to 52.14 km2 in 2017, equivalent to a 35.6% reduction in area, especially as for the glaciers located in the West, Southwest, North, and Northeast sectors, with losses between 65% and 44% of total area, and front-line elevation variations between 74 m and 570 m. The mean precipitation was 2539 mm in the period 1950‑2017 and is evidenced a tendency to decrease precipitation of approximately -18 mm per year. The temperature data show an annual average of 9.87°C and a continuous trend of increase in the region of 0.04°C between 1948 and 2017. The contrasts between glaciers in loss of area and variation of front line elevation are related to differences in area and geomorphometry of each glacier. These glaciers are similar in size, elevation and slope of the front sector, and the variations identified can be related to warm, and dryer trends for the region in the analysed period. |
| format | info:eu-repo/semantics/article |
| id | clacso-CLACSO42347 |
| institution | CLACSO, Repositorio Digital |
| language | Portugués |
| publishDate | 2020 |
| publisher | Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas |
| record_format | greenstone |
| spelling | clacso-CLACSO423472022-03-17T15:14:45Z Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades Respostas das geleiras do Monte Melimoyu, Chile, às tendências mais secas e quentes da Patagônia Norte nas últimas décadas Idalino, Filipe Daros Rosa, Kátia Kellem da Simões, Jefferson Cardia Glacier fluctuations Northern Chilean Patagonia Multitemporal analysis Climate changes Variação glacial Patagônia Norte chilena Análise multitemporal Mudanças climáticas In this paper were investigated area variations in glaciers on Mount Melimoyu (44ºS, 72ºW) in the period of 1970-2017, and possible relationships with the climate variability between 1950 and 2017. Optical data from Sentinel-2A, and elevation from Digital Elevation Model (DEM) ASTER-GDEM v.2 and area data from GLIMS inventory were used in GIS analyse. The temporal series of annual precipitation data by Explorador Climático - Chile, and temperature data of reanalysis from the University of Delaware were utilised for climate analysis. The glaciers area reduced from 80.97 km2 in 1970 to 52.14 km2 in 2017, equivalent to a 35.6% reduction in area, especially as for the glaciers located in the West, Southwest, North, and Northeast sectors, with losses between 65% and 44% of total area, and front-line elevation variations between 74 m and 570 m. The mean precipitation was 2539 mm in the period 1950‑2017 and is evidenced a tendency to decrease precipitation of approximately -18 mm per year. The temperature data show an annual average of 9.87°C and a continuous trend of increase in the region of 0.04°C between 1948 and 2017. The contrasts between glaciers in loss of area and variation of front line elevation are related to differences in area and geomorphometry of each glacier. These glaciers are similar in size, elevation and slope of the front sector, and the variations identified can be related to warm, and dryer trends for the region in the analysed period. Neste trabalho foram investigadas variações de área nas geleiras no Monte Melimoyu (44ºS, 72ºO) no período de 1970-2017, e as possíveis relações com a variabilidade climática entre 1950 e 2017. Dados ópticos do Sentinel-2A, de elevação do Modelo Digital de Elevação (MDE) ASTER-GDEM v.2, e de área das geleiras do inventário GLIMS foram utilizados na análise em SIG. As séries temporais de precipitação do Explorador Climático - Chile, e dados de reanálise de temperatura da universidade de Delaware foram utilizados para a análise climática. A área das geleiras diminuiu de 80,97 km² em 1970 para 52,14 km² em 2017, representando 35,6% de área, com destaques para a retração de geleiras no Oeste, Sudoeste, Norte e Nordeste, com perdas entre 65% e 44% de área total, e variações de elevação da linha de frente entre 74 m e 570 m. A precipitação anual média aproximada foi de 2.359 mm no período de 1950 a 2017 e mostra tendência de diminuição de aproximadamente -18 mm/ano, enquanto que os dados de temperatura mostram média anual de 9,87°C e uma tendência contínua de aumento na região, de 0,04ºC entre 1948 e 2017. Os contrastes entre as geleiras em perda de área e variação de elevação da linha de frente estão relacionados às diferenças de área e geomorfometria de cada geleira. Essas geleiras são semelhantes em tamanho, altitude e declividade do setor frontal, e as variações identificadas podem estar relacionadas às tendências mais quentes e secas para o período analisado. 2020-07-06 2022-03-17T15:14:45Z 2022-03-17T15:14:45Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.revistas.usp.br/rdg/article/view/160197 10.11606/rdg.v39i0.160197 http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/42347 por https://www.revistas.usp.br/rdg/article/view/160197/162092 Copyright (c) 2020 Filipe Daros Idalino, Kátia Kellem da Rosa, Jefferson Cardia Simões application/pdf Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas Revista do Departamento de Geografia; ##issue.vol## 39 (2020); 126-137 Revista do Departamento de Geografia; v. 39 (2020); 126-137 Revista do Departamento de Geografia; Vol. 39 (2020); 126-137 2236-2878 0102-4582 |
| spellingShingle | Glacier fluctuations Northern Chilean Patagonia Multitemporal analysis Climate changes Variação glacial Patagônia Norte chilena Análise multitemporal Mudanças climáticas Idalino, Filipe Daros Rosa, Kátia Kellem da Simões, Jefferson Cardia Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title | Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title_full | Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title_fullStr | Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title_full_unstemmed | Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title_short | Response of Mount Melimoyu glaciers, Chile, to dryer and warming climatic trends for Northern Patagonian region in last decades |
| title_sort | response of mount melimoyu glaciers, chile, to dryer and warming climatic trends for northern patagonian region in last decades |
| topic | Glacier fluctuations Northern Chilean Patagonia Multitemporal analysis Climate changes Variação glacial Patagônia Norte chilena Análise multitemporal Mudanças climáticas |
| url | https://www.revistas.usp.br/rdg/article/view/160197 http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/42347 |