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Cambios en la estructura de velocidad de la capa de hielo de Groenlandia
Eric Rignot1, Pannir Kanagaratnam
1Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 300-319, Pasadena, CA 91109-8099, USA. eric.rignot@jpl.nasa.gov
Science (New York, N.Y.)
|February 18, 2006
Resumen
Los glaciares de Groenlandia se están acelerando y aumentando la descarga de hielo, lo que contribuye significativamente al aumento global del nivel del mar. Esta tendencia se está expandiendo hacia el norte, lo que indica futuros aumentos en las contribuciones al nivel del mar de Groenlandia.
Área de la Ciencia:
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La dinámica de la capa de hielo de Groenlandia es crucial para comprender el cambio global del nivel del mar.
- Estudios previos indicaron la pérdida regional de hielo, pero los patrones de aceleración generalizados requirieron más investigación.
Objetivo del estudio:
- Para cuantificar el alcance y el momento de la aceleración de los glaciares en Groenlandia.
- Para evaluar el impacto de la descarga acelerada de hielo en el balance de masa de la capa de hielo de Groenlandia.
Principales métodos:
- Utilizó observaciones de interferometría de radar satelital que abarcan varios años.
- Analizó los cambios de velocidad de los glaciares para detectar eventos de aceleración.
Principales resultados:
- La aceleración generalizada de los glaciares se detectó por debajo de 66°N entre 1996 y 2000, expandiéndose a 70°N en 2005.
- La descarga acelerada de hielo, especialmente en el oeste y el este de Groenlandia, duplicó el déficit de masa de la capa de hielo de 90 a 220 km3 / año en la última década.
- La tasa de pérdida de hielo está aumentando.
Conclusiones:
- La aceleración continua hacia el norte de los glaciares sugiere una contribución continua y creciente al aumento del nivel del mar desde Groenlandia.
- El déficit de masa de la capa de hielo de Groenlandia está empeorando debido a la pérdida dinámica generalizada de hielo.
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