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Extensión vertical del sistema de drenaje subglacial en las grietas basales
Joel T Harper1, John H Bradford, Neil F Humphrey
1Department of Geosciences, University of Montana, Montana 59812, USA. joel@mso.umt.edu
Nature
|October 1, 2010
Resumen
El agua subglacial puede llenar grietas basales que se extienden en lo alto de los glaciares, aumentando significativamente el almacenamiento de agua. Este hallazgo impacta nuestra comprensión del deslizamiento de los glaciares y las predicciones del aumento del nivel del mar.
Área de la Ciencia:
- Glaciología glaciología.
- Hidrología Hidrología Hidrología.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- El deslizamiento basal de los glaciares está significativamente influenciado por el agua subglacial.
- La comprensión de la extensión del agua subglacial está limitada por los desafíos observacionales.
- La simulación precisa de la dinámica del hielo es crucial para la predicción del aumento del nivel del mar.
Objetivo del estudio:
- Para investigar la configuración y el volumen del agua subglacial.
- Para determinar si el agua subglacial ocupa características más allá de la interfaz del lecho de hielo.
- Evaluar las implicaciones para la dinámica de los glaciares y el aumento del nivel del mar.
Principales métodos:
- Utilizó radar e imágenes sísmicas en el glaciar Bench, Alaska.
- Se realizan mediciones de pozos de perforación in situ.
- Se analizaron datos para identificar y cuantificar las grietas basales llenas de agua.
Principales resultados:
- Descubrió numerosas grietas basales llenas de agua que se extienden decenas de metros en el hielo.
- Volumen de agua cuantificado en grietas equivalentes a una capa de un decímetro a través del lecho.
- Se han confirmado conexiones altamente transmisibles entre las grietas y el lecho del glaciar.
Conclusiones:
- Los sistemas hidrológicos subglaciales pueden extenderse significativamente en el hielo superpuesto a través de grietas basales.
- Las grietas basales mejoran la capacidad de almacenamiento de agua y pueden modular la presión del agua subglacial.
- Los hallazgos requieren una reevaluación de los modelos hidrológicos subglaciales para los glaciares y las capas de hielo.
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