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La actividad de la corriente de hielo escalada al volumen de la capa de hielo durante la deglaciación de la capa de
C R Stokes1, M Margold1, C D Clark2
1Department of Geography, Durham University, Durham, UK.
Nature
|February 19, 2016
Resumen
Las corrientes de hielo en la antigua capa de hielo de Laurentide disminuyeron en número y descarga con el tiempo. Esto sugiere que las corrientes de hielo pueden ejercer menos influencia en el equilibrio de masa de la capa de hielo de lo que se pensaba anteriormente.
Área de la Ciencia:
- Paleoclimatología
- Glaciología
- Dinámica de las capas de hielo
Sus antecedentes:
- Las capas de hielo de Groenlandia y la Antártida contribuyen significativamente al aumento del nivel del mar debido al adelgazamiento y retroceso de los glaciares.
- La incertidumbre en la predicción del aumento futuro del nivel del mar se deriva de los datos limitados a largo plazo sobre el comportamiento de las corrientes de hielo.
- La comprensión de la evolución de las corrientes de hielo es crucial para las predicciones precisas del balance de masa de la capa de hielo.
Objetivo del estudio:
- Para reconstruir la actividad histórica de las corrientes de hielo durante la deglaciación de la capa de hielo de Laurentide.
- Para investigar cómo la red de corrientes de hielo evolucionó en escalas de tiempo milenarias.
- Evaluar la influencia a largo plazo de las corrientes de hielo en el balance de masas de las capas de hielo.
Principales métodos:
- Reconstrucción de 117 actividades de las corrientes de hielo durante la deglaciación de la capa de hielo de Laurentide (hace 22.000-7.000 años).
- Análisis del número de corrientes de hielo, extensión espacial y descarga en el tiempo.
- Correlación de la actividad de las corrientes de hielo con la geología subyacente, la topografía y los cambios en el volumen de la capa de hielo.
Principales resultados:
- El número de corrientes de hielo activas disminuyó a medida que la capa de hielo de Laurentide se retiró.
- Las corrientes de hielo ocuparon un porcentaje más pequeño del perímetro de la capa de hielo con el tiempo.
- La descarga total de hielo de las corrientes de hielo disminuyó durante todo el período de deglaciación.
Conclusiones:
- Actividad de las corrientes de hielo y redes de drenaje ajustadas en respuesta al volumen cambiante de la capa de hielo.
- Contrariamente a algunas teorías, las corrientes de hielo ejercieron progresivamente menos influencia en el equilibrio de masa de la capa de hielo de Laurentide durante la deglaciación.
- Los hallazgos pueden ofrecer información sobre la dinámica moderna de las capas de hielo, aunque la traducción directa requiere precaución.
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