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La descarga rápida conecta los lagos subglaciales antárticos de la Antártida

Duncan J Wingham¹, Martin J Siegert, Andrew Shepherd

¹Centre for Polar Observation and Modelling, Department of Space and Climate Physics, Pearson Building, University College London, Gower Street, London WC1E 6BT, UK. djw@cpom.ucl.ac.uk

|April 21, 2006

Resumen

El agua subglacial debajo de la Antártida Oriental se está descargando activamente, con 1,8 km3 transferidos entre lagos en 16 meses. Este rápido drenaje desafía los modelos existentes y pone de relieve los riesgos para la exploración subglacial.

Área de la Ciencia:

La geofísica es la geofísica.
Glaciología glaciología.
Hidrología Hidrología Hidrología.

Sus antecedentes:

Los sistemas de aguas subglaciales debajo de la capa de hielo de la Antártida Oriental son cruciales para comprender el flujo de hielo y los procesos glaciales.
El conocimiento actual de la hidrología subglacial es limitado, a pesar de la presencia generalizada de lagos subglaciales.

Objetivo del estudio:

Para investigar los eventos de descarga rápida de agua de los lagos subglaciales en el centro de la Antártida Oriental.
Comprender las implicaciones de la hidrología dinámica subglacial para el comportamiento de las capas de hielo y los entornos subglaciales.

Principales métodos:

Análisis de los cambios de elevación de la superficie de las capas de hielo utilizando datos satelitales.
Interpretación de datos geodésicos para inferir la transferencia de agua subglacial.

Principales resultados:

Se observó una descarga rápida de 1,8 km3 de agua a lo largo de 290 km en 16 meses.
La evidencia sugiere que los sistemas de lagos subglaciales son inestables y propensos a las descargas periódicas a gran escala.
Los eventos de descarga desafían las suposiciones de largos tiempos de residencia y una circulación lenta en los lagos subglaciales.

Conclusiones:

Los sistemas de lagos subglaciales exhiben un comportamiento dinámico, y los eventos de descarga rápida son un modo de drenaje común.
Puede ocurrir el lavado periódico de cuencas de drenaje subglaciales enteras.
La rápida transferencia de agua plantea riesgos de reubicación de solutos y microbios y contaminación para futuras exploraciones in situ.

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