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La extensión de los glaciares durante el Dryas más joven y el evento de 8.2 ka en la isla de Baffin, en el Ártico
Nicolás E Young1, Jason P Briner, Dylan H Rood
1Department of Geology, University at Buffalo, 411 Cooke Hall, Buffalo, NY 14260, USA. nicolasy@ldeo.columbia.edu
Science (New York, N.Y.)
|September 18, 2012
Resumen
El evento frío de 8,2 ka causó avances significativos de los glaciares en la isla de Baffin, en el Ártico canadiense, con glaciares de montaña que excedieron el tamaño del Dryas más joven. Esto sugiere un patrón de enfriamiento estacional diferente en comparación con el Dryas más joven.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Ciencia Cuaternaria La ciencia cuaternaria es la ciencia cuaternaria.
Sus antecedentes:
- Los núcleos de hielo de Groenlandia indican que el Dryas más joven (YD) y los eventos fríos de 8,2 ka fueron significativamente más fríos que el presente.
- Comprender las respuestas de las capas de hielo y los glaciares a los cambios climáticos pasados es crucial para predecir la sensibilidad futura de las capas de hielo.
Objetivo del estudio:
- Para reconstruir la respuesta de la capa de hielo de Laurentide y los glaciares de las montañas de la isla de Baffin al evento climático de 8,2 ka.
- Para comparar el comportamiento de los glaciares durante el evento de 8,2 ka con el del Dryas más joven.
Principales métodos:
- Análisis de núcleos de hielo para datos paleoclimáticos.
- Reconstrucción del glaciar de salida de la capa de hielo y las extensiones de los glaciares de montaña en la isla de Baffin.
Principales resultados:
- El avance generalizado de los glaciares de salida de la capa de hielo de Laurentide y los glaciares de montaña de la isla de Baffin se produjo en respuesta al evento de 8.2 ka.
- Los glaciares de montaña durante el evento de 8,2 ka fueron más grandes que los de la Dryas más joven.
- El enfriamiento durante el evento de 8.2 ka fue probablemente más estacionalmente uniforme que el enfriamiento sesgado por el invierno del YD.
Conclusiones:
- El evento de 8,2 ka desencadenó una expansión glacial sustancial, lo que indica una sensibilidad significativa de la capa de hielo y los glaciares a las perturbaciones climáticas.
- La dinámica de los glaciares observada y la distribución estacional de la temperatura proporcionan información sobre la variabilidad climática regional durante el Holoceno temprano.
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