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La aceleración inducida por el derretimiento de la superficie del flujo de la capa de hielo de Groenlandia
H Jay Zwally1, Waleed Abdalati, Tom Herring
1Oceans and Ice Branch, Code 971, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. jay.zwally@gsfc.nasa.gov
Science (New York, N.Y.)
|June 8, 2002
Resumen
El derretimiento del verano acelera el flujo de hielo de Groenlandia al lubricar la base de la capa de hielo. El aumento del agua de deshielo aumenta el deslizamiento de los glaciares, afectando la dinámica de las capas de hielo y potencialmente respondiendo al calentamiento climático.
Área de la Ciencia:
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre
Sus antecedentes:
- La dinámica de la capa de hielo de Groenlandia es crucial para comprender el aumento del nivel del mar.
- La relación entre el agua de fusión superficial y el flujo de hielo es compleja.
- Las zonas de equilibrio de las capas de hielo experimentan respuestas variadas a las condiciones de la superficie.
Objetivo del estudio:
- Para investigar el impacto del derretimiento de la superficie en verano en la aceleración del flujo de hielo en Groenlandia.
- Determinar el mecanismo que vincula el agua de deshielo con el deslizamiento glacial mejorado.
- Para evaluar la correlación entre la intensidad de fusión y la aceleración del hielo.
Principales métodos:
- Análisis de los datos de flujo de hielo de la capa de hielo de Groenlandia centro-oeste.
- Análisis de correlación entre la duración/intensidad del derretimiento de la superficie y las tasas de aceleración del hielo.
- Investigando el papel de la migración del agua de deshielo a la interfaz entre el lecho de hielo y la roca.
Principales resultados:
- El flujo de hielo se acelera significativamente durante los períodos de derretimiento de verano, superando las tasas de mitad de invierno.
- La aceleración del hielo está directamente relacionada con la duración y la intensidad del derretimiento de la superficie.
- La desaceleración ocurre después de que el derretimiento cesa, lo que apoya la hipótesis de lubricación del agua de fusión.
Conclusiones:
- El agua de deshielo superficial mejora el deslizamiento glacial al alcanzar la interfaz de hielo y lecho de roca.
- Existe un acoplamiento directo entre la fusión de la superficie y la dinámica del flujo de la capa de hielo.
- Este mecanismo sugiere que las capas de hielo pueden responder rápidamente al calentamiento climático a través del aumento del derretimiento.
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