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Vigorosa exportación lateral del flujo de salida del agua de deshielo desde debajo de una plataforma de hielo

Alberto C Naveira Garabato¹, Alexander Forryan¹, Pierre Dutrieux^2,3

¹Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK.

|January 31, 2017

Resumen

El agua de fusión del hielo antártico se hunde en las profundidades del océano debido a una inestabilidad centrífuga. Este proceso, impulsado por las corrientes oceánicas, impacta los modelos climáticos y la comprensión de los impactos del derretimiento del hielo antártico.

Área de la Ciencia:

La oceanografía
Glaciología
Ciencias del clima

Sus antecedentes:

El derretimiento de la capa de hielo antártica es un factor clave del cambio climático global.
La distribución vertical del agua de deshielo tiene un impacto significativo en el nivel del mar, la circulación oceánica y los ecosistemas.
Los modelos climáticos actuales a menudo tergiversan la profundidad del agua de deshielo, generalmente asumiendo una entrada cercana a la superficie.

Objetivo del estudio:

Identificar el mecanismo que controla la profundidad del agua de deshielo exportada desde las plataformas de hielo antárticas.
Para investigar el papel de las propiedades turbulentas en el comportamiento del penacho de agua de fusión.
Para mejorar la precisión de los modelos climáticos que simulan el derretimiento del hielo antártico.

Principales métodos:

Observaciones in situ de las propiedades turbulentas de las salidas de agua de fusión.
Análisis de la ascensión del agua de deshielo y la dinámica de mezcla debajo de una plataforma de hielo antártica.
Modelado idealizado de la circulación oceánica para probar la aplicabilidad del mecanismo.

Principales resultados:

El flujo de salida de agua de fusión desencadena una inestabilidad de inversión centrífuga.
Esta inestabilidad extrae energía del cizallamiento oceánico, promoviendo la exportación lateral y la mezcla.
El agua de deshielo se deposita en los niveles más profundos del océano, no cerca de la superficie.

Conclusiones:

Un mecanismo robusto explica la exportación profunda de agua de deshielo de las plataformas de hielo de la Antártida.
Este proceso está muy extendido en varias plataformas de hielo de la Antártida.
La incorporación de este mecanismo en los modelos climáticos es crucial para las predicciones precisas.

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