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Fuerte sensibilidad del derretimiento de la plataforma de hielo de Pine Island a la variabilidad climática

Pierre Dutrieux¹, Jan De Rydt, Adrian Jenkins

¹British Antarctic Survey, Natural Environment Research Council (NERC), Cambridge, UK.

Science (New York, N.Y.)

|January 4, 2014

Resumen

El derretimiento del glaciar de Pine Island tiene un impacto significativo en el aumento del nivel del mar. Las fluctuaciones de calor del océano y la topografía del fondo marino controlan las tasas de fusión, influenciadas por eventos atmosféricos como La Niña.

Área de la Ciencia:

Glaciología glaciología.
Oceanografía La oceanografía es la oceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

El adelgazamiento y la aceleración del glaciar de Pine Island contribuyen al aumento global del nivel del mar.
El aumento del derretimiento de la plataforma de hielo es un conductor sospechoso de estos cambios.

Objetivo del estudio:

Para investigar las causas de los cambios recientes en el glaciar de Pine Island.
Comprender el papel del calor oceánico y la geografía local en el derretimiento de las plataformas de hielo.

Principales métodos:

Utilizó observaciones y modelado numérico.
Se analizó el contenido de calor del océano y la sensibilidad al derretimiento de la plataforma de hielo.
Investigó el impacto de la topografía del fondo marino y el forzamiento atmosférico.

Principales resultados:

El derretimiento oceánico disminuyó en un 50% entre enero de 2010 y 2012.
El derretimiento de las plataformas de hielo es sensible a las temperaturas intermedias del agua debido a una cresta del lecho marino.
Las condiciones del océano en 2012 fueron influenciadas por La Niña.

Conclusiones:

La variabilidad atmosférica y la geometría local de la plataforma de hielo / fondo marino son factores críticos en la respuesta de la capa de hielo antártica.
El calor del océano y la topografía influyen significativamente en la dinámica de fusión del glaciar de Pine Island.

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