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Mega cañón paleofluvial bajo la capa de hielo central de Groenlandia
Jonathan L Bamber1, Martin J Siegert, Jennifer A Griggs
1Bristol Glaciology Centre, University of Bristol, Bristol, UK. j.bamber@bristol.ac.uk
Science (New York, N.Y.)
|August 31, 2013
Resumen
Los investigadores descubrieron un enorme cañón subglacial de 750 km de largo en Groenlandia utilizando un radar penetrante en el hielo. Esta antigua característica geológica probablemente influyó en el flujo de agua basal de la capa de hielo de Groenlandia durante los ciclos glaciales pasados.
Área de la Ciencia:
- Glaciología glaciología.
- Geomorfología Geomorfología.
- La geofísica es la geofísica.
Sus antecedentes:
- La topografía subglacial impacta significativamente la distribución del agua basal y la dinámica del flujo de hielo.
- En la Antártida, la topografía previa a la capa de hielo ofrece información sobre los procesos tectónicos y geomorfológicos pasados.
- El paisaje subglacial de Groenlandia a menudo se considera relativamente plano, lo que limita la investigación sobre tales asociaciones.
Objetivo del estudio:
- Para investigar la topografía subglacial en Groenlandia utilizando un radar que penetra en el hielo.
- Identificar y caracterizar las características subglaciales a gran escala y su potencial influencia en los procesos de las capas de hielo.
- Explorar las implicaciones de la antigua topografía para la historia glacial y la hidrología de Groenlandia.
Principales métodos:
- Adquisición y análisis de datos de radar de penetración de hielo del norte de Groenlandia.
- Interpretación geomorfológica de perfiles de radar para identificar las formas de relieve subglaciales.
- Modelado de posibles vías de flujo de aguas basales influenciadas por la topografía identificada.
Principales resultados:
- Descubrimiento de un cañón subglacial de 750 km de largo en el norte de Groenlandia.
- Las dimensiones del cañón sugieren que es una característica significativa que influye en la hidrología subglacial.
- La evidencia indica que el cañón probablemente es anterior a la formación de la capa de hielo de Groenlandia.
Conclusiones:
- El mega cañón identificado probablemente ha influido en el flujo de agua basal desde el interior de la capa de hielo hasta el margen.
- Esta antigua topografía ha desempeñado un papel en la hidrología basal de Groenlandia a lo largo de los ciclos glaciales pasados.
- Investigaciones adicionales sobre el paisaje subglacial de Groenlandia pueden revelar información crucial sobre su pasado geológico y glacial.
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