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Rápido adelgazamiento del glaciar de Pine Island en el Holoceno temprano

J S Johnson¹, M J Bentley, J A Smith

¹British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK.

Science (New York, N.Y.)

|February 22, 2014

Resumen

El glaciar de Pine Island experimentó un rápido adelgazamiento a principios del Holoceno, similar al de hoy. Esta antigua pérdida de hielo, impulsada por los cambios de la plataforma de hielo, persistió durante siglos, destacando la inestabilidad a largo plazo de la capa de hielo.

Área de la Ciencia:

Glaciología glaciología.
Paleoclimatología Paleoclimatología
Dinámica de las capas de hielo de la Antártida Occidental Dinámica de las capas de hielo de la Antártida Occidental

Sus antecedentes:

Pine Island Glacier (PIG) es un importante glaciar de salida de la capa de hielo de la Antártida Occidental.
PIG ha exhibido un importante adelgazamiento y retroceso en las últimas dos décadas.

Objetivo del estudio:

Para investigar eventos pasados de adelgazamiento rápido del glaciar de Pine Island.
Para comparar las tasas de adelgazamiento del Holoceno temprano con los cambios contemporáneos.

Principales métodos:

Se utilizaron datos geológicos glaciales.
Se emplearon técnicas geocronológicas, específicamente cosmogónicas (10), para datar las rocas transportadas por los glaciares.

Principales resultados:

El glaciar de Pine Island experimentó un rápido adelgazamiento hace unos 8000 años durante el Holoceno temprano.
Las tasas de adelgazamiento superaron los 100 cm/año, sostenidas durante décadas o siglos.
Este adelgazamiento pasado es comparable a las tasas actuales y es probable que sea causado por la reducción del apuntalamiento de la plataforma de hielo.

Conclusiones:

El glaciar de Pine Island tiene una historia de eventos de adelgazamiento rápido.
Una vez iniciados, los rápidos cambios de la capa de hielo en esta región pueden ser duraderos, persistiendo durante siglos.

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