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Author: search.filters.author.Bustamante Rosell, Maria Gracia

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    Item type:Publication,
    700,000 years of tropical Andean glaciation
    (Nature Research, 2022)
    Bustamante Rosell, Maria Gracia
    ;
    Tapia Ormeño, Pedro
    Este estudio proporciona un registro continuo e independiente de glaciaciones tropicales en los Andes, basado en un núcleo de pistón extraído del lago Junín, ubicado en la cuenca superior del Amazonas. El núcleo abarca un periodo de 700,000 años y ofrece una visión única de los ciclos glaciales e interglaciales tropicales. Los hallazgos revelan que los glaciares tropicales en los Andes respondieron de manera sincronizada a los cambios en el volumen de hielo global, siguiendo una periodicidad de aproximadamente 100,000 años, similar a la observada en otras regiones del planeta. Este registro continuo ofrece nuevos insights sobre las teleconexiones climáticas que han impulsado los ciclos de glaciación en los trópicos, proporcionando una base valiosa para comparaciones interhemisféricas más detalladas y para la comprensión de los patrones climáticos a largo plazo en la región andina.
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    Using satellite imagery to assess glacier retreat in King George Island, Antarctica; Utilización de imágenes por satélite para evaluar el retroceso de los glaciares en la Isla Rey Jorge (Antártida)
    (Universidad Politecnica de Valencia, 2024)
    Bustamante Rosell, Maria Gracia
    ;
    Rojas Macedo, Ibeth
    In recent decades, remote sensing has become a powerful tool for continuously monitoring glacier dynamics in remote areas, enabling the identification of significant spatiotemporal changes due to its capacity to provide multitemporal information at regional and global scales. In this study, Landsat satellite images (1989–2020) were used to quantify glacier retreat in the ice cap of King George Island (KGI), located in the Antarctic Peninsula, and to evaluate the teleconnections ofEl Niño – Southern Oscillation - ENSO (ONI and SOI indices) with climatic variables (temperature and precipitation) in this region. Our findings reveal a 10% loss in glacier coverage over the last 31 years, with a slower glacier retreat observed since 2008. Glaciers with smaller areas and marine terminating were the most affected. Of the 73 glaciers on KGI, 42% had continental terminating, 21% had marine terminating, and 37% had mixed terminating (continental and marine). Of the total glacier area lost, 35% corresponds to glaciers with marine terminating, while 16% corresponds to glaciers with continental terminating. Furthermore, climatic variables exhibited heterogeneous responses during ENSO events, with a significant correlation between mean temperature and ONI at the annual level and during the austral spring, which may be influencing glacier retreat in the study area to some extent.