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Comentario sobre "La fricción en el lecho no controla el flujo rápido del glaciar"
Brent M Minchew1, Colin R Meyer2, Samuel S Pegler3
1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA. minchew@mit.edu.
Science (New York, N.Y.)
|February 9, 2019
Resumen
El deslizamiento rápido de los glaciares parece independiente de la resistencia basal, incluso bajo alta tensión. Este hallazgo desafía la física convencional, lo que sugiere que la velocidad de deslizamiento puede no depender del estrés de conducción gravitacional.
Área de la Ciencia:
- Glaciología
- Ciencias de la Tierra
- Física del hielo
Sus antecedentes:
- La resistencia basal se considera tradicionalmente un control primario de la velocidad de deslizamiento de los glaciares.
- La relación entre la fricción basal y la dinámica del flujo de hielo es un área clave de la investigación glaciológica.
Objetivo del estudio:
- Evaluar críticamente la conclusión de que el deslizamiento rápido de los glaciares es independiente de la resistencia basal.
- Para abordar las implicaciones físicas fundamentales de esta independencia propuesta.
Principales métodos:
- Análisis de los datos glaciológicos existentes y modelos teóricos.
- Examen de los principios físicos que rigen el flujo de hielo y las interacciones basales.
Principales resultados:
- El estudio pone de relieve una inconsistencia física significativa en la afirmación de la independencia de la resistencia basal.
- La velocidad de deslizamiento rápido del glaciar parece ser independiente de la resistencia basal, incluso cuando la resistencia equilibra el estrés de conducción.
Conclusiones:
- La conclusión de que el deslizamiento rápido de los glaciares es independiente de la resistencia basal presenta desafíos físicos fundamentales.
- Esto implica que la velocidad de deslizamiento del hielo podría desacoplarse de las tensiones dentro de la columna de hielo, incluida la tensión de conducción gravitacional.
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