Cambios en el albedo de los glaciares de la Sierra del Brujo entre 2013 y 2023.
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Concepción
Abstract
Este estudio analizó el albedo glaciar, la temperatura y la precipitación acumulada en la Sierra del Brujo, entre abril de 2013 y abril de 2023 d. El método de estimación de albedo es a partir de imágenes satelitales Landsat 8 y tuvo como base la adaptación de ecuaciones propuestas en estudios previos, para lo que se siguió una serie de pasos que pueden resumirse en recopilar, depurar y analizar los datos. Se observaron fluctuaciones estacionales típicas en la temperatura, con meses más cálidos (enero y febrero) contrastando con los más fríos (junio), y variaciones notables en la precipitación, destacándose picos en mayo de 2013 y abril de 2016, además de periodos de precipitación nula. Los análisis estadísticos revelaron asociaciones significativas entre la temperatura, la precipitación y el albedo glaciar. Se identificó una relación negativa sólida entre la temperatura y el albedo, indicando que el aumento de la temperatura se asocia con una disminución en la reflectividad de los glaciares. Por otro lado, se encontró una correlación positiva entre la precipitación acumulada y el albedo, sugiriendo que niveles superiores de precipitación están relacionados con un aumento en la reflectividad de los glaciares. Las medias móviles trimestrales del albedo mostraron su capacidad para seguir las tendencias estacionales, aunque con cierto desfase en momentos de cambios bruscos. Las correlaciones de Pearson y los modelos de regresión múltiple confirmaron la influencia directa de la temperatura y la precipitación acumulada en el albedo glaciar. Si bien la hipótesis inicial sobre la relación entre el aumento de las temperaturas, la disminución de la precipitación y la reducción del albedo se confirmó parcialmente, mostrando una asociación sólida entre temperatura y albedo, la relación con la precipitación no fue concluyente en la región estudiada. En resumen, el estudio destacó la influencia directa de la temperatura en el albedo glaciar, subrayando la complejidad de los factores climáticos que inciden en la dinámica de los glaciares. Los resultados enfatizan la importancia de comprender y monitorear estos cambios para evaluar el impacto del clima en los ecosistemas glaciares.
This study focused on analyzing glacier albedo, temperature, and cumulative precipitation in the Sierra del Brujo, between April 2013 and April 2023 . The albedo estimation method relied on Landsat 8 satellite images, adapting equations proposed in previous studies. This involved several steps such as data collection, refining, and analysis. Typical seasonal temperature fluctuations were observed, with warmer months (January and February) contrasting with colder ones (June), alongside noticeable variations in precipitation. Peaks were notable in May 2013 and April 2016, with periods of no precipitation. Statistical analyses revealed significant associations among temperature, precipitation, and glacier albedo. A strong negative relationship between temperature and albedo was identified, indicating that higher temperatures are linked to reduced glacier reflectivity. Conversely, a positive correlation between cumulative precipitation and albedo suggested that higher precipitation levels are associated with increased glacier reflectivity. Quarterly moving averages of albedo displayed their ability to track seasonal trends, albeit with some lag during abrupt changes. Pearson correlations and multiple regression models confirmed the direct influence of temperature and cumulative precipitation on glacier albedo. Although the initial hypothesis concerning the relationship between rising temperatures, decreased precipitation, and reduced albedo was partially confirmed—showing a strong association between temperature and albedo— the link with precipitation was inconclusive in the studied region. In conclusion, the study underscored the direct impact of temperature on glacier albedo, highlighting the complexity of climatic factors affecting glacier dynamics. The findings emphasize the importance of understanding and monitoring these changes to assess the climate's impact on glacier ecosystems.
This study focused on analyzing glacier albedo, temperature, and cumulative precipitation in the Sierra del Brujo, between April 2013 and April 2023 . The albedo estimation method relied on Landsat 8 satellite images, adapting equations proposed in previous studies. This involved several steps such as data collection, refining, and analysis. Typical seasonal temperature fluctuations were observed, with warmer months (January and February) contrasting with colder ones (June), alongside noticeable variations in precipitation. Peaks were notable in May 2013 and April 2016, with periods of no precipitation. Statistical analyses revealed significant associations among temperature, precipitation, and glacier albedo. A strong negative relationship between temperature and albedo was identified, indicating that higher temperatures are linked to reduced glacier reflectivity. Conversely, a positive correlation between cumulative precipitation and albedo suggested that higher precipitation levels are associated with increased glacier reflectivity. Quarterly moving averages of albedo displayed their ability to track seasonal trends, albeit with some lag during abrupt changes. Pearson correlations and multiple regression models confirmed the direct influence of temperature and cumulative precipitation on glacier albedo. Although the initial hypothesis concerning the relationship between rising temperatures, decreased precipitation, and reduced albedo was partially confirmed—showing a strong association between temperature and albedo— the link with precipitation was inconclusive in the studied region. In conclusion, the study underscored the direct impact of temperature on glacier albedo, highlighting the complexity of climatic factors affecting glacier dynamics. The findings emphasize the importance of understanding and monitoring these changes to assess the climate's impact on glacier ecosystems.
Description
Tesis presentada para optar al título profesional de Geógrafo
Keywords
Glaciares, Albedo, Monitoreo ambiental