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El rápido aumento del nivel del mar deglacial causado por la capa de hielo se derrumba la silla de montar

Lauren J Gregoire¹, Antony J Payne, Paul J Valdes

¹School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, UK. lauren.gregoire@bristol.ac.uk

|July 13, 2012

Resumen

Durante la última deglaciación, el colapso de la silla de montar de la capa de hielo causó abruptos pulsos de agua de deshielo, lo que llevó a un rápido aumento del nivel del mar. Este mecanismo explica eventos importantes como el Pulso de Agua de Fusión 1A y el evento de 8.200 años.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
Glaciología glaciología.
Modelado del clima en el modelo climático.

Sus antecedentes:

La última deglaciación presentó abruptos pulsos de agua de deshielo que causaron cambios climáticos.
Meltwater Pulse 1A (MWP-1A) hace unos 14.000 años causó 14-18 metros de aumento del nivel del mar en 350 años.
La fuente y los mecanismos de MWP-1A y eventos similares siguen siendo objeto de debate.

Objetivo del estudio:

Para investigar la dinámica de la capa de hielo detrás de los principales pulsos de agua de deshielo.
Para identificar la fuente geográfica y los mecanismos físicos de MWP-1A.
Para explorar el vínculo potencial entre el colapso de la silla de hielo y los eventos climáticos bruscos.

Principales métodos:

Se realizaron simulaciones de modelado de la capa de hielo.
El modelo simula la separación de las capas de hielo de América del Norte (Laurentida y Cordillera).
El modelo investigó el papel de la separación del domo de hielo y la disminución de la superficie en la liberación de agua de deshielo.

Principales resultados:

La separación modelada de las capas de hielo, específicamente Laurentide y Cordilleran, generó un pulso consistente con MWP-1A.
La separación de las cúpulas de hielo de Labrador y Baffin simuló un pulso vinculado al evento de 8.200 años.
El colapso de la silla de hielo debido al calentamiento y la disminución de la superficie aceleró el derretimiento, causando ~ 9 metros de aumento del nivel del mar en 500 años para eventos modelados.

Conclusiones:

El "colapso de la silla de montar" de hielo se propone como el mecanismo para MWP-1A y el evento de 8.200 años.
Este mecanismo pone de relieve el impacto significativo de la dinámica de las capas de hielo en el nivel del mar pasado y el clima.
Comprender estos eventos proporciona información sobre el comportamiento de las capas de hielo y la respuesta climática.

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