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Se ha documentado el drenaje generalizado de agua de deshielo superficial en la Antártida, formando grandes estanques y arroyos. Este fenómeno persistente, observado durante décadas, podría acelerar la pérdida de masa de hielo y el aumento del nivel del mar en un clima cálido.

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Área de la Ciencia:

  • * Glaciología y climatología.
  • * Investigaciones polares y estudios de la criosfera.

Sus antecedentes:

  • * El agua de la superficie derretida en las capas de hielo forma estanques, lo que puede causar el colapso de la plataforma de hielo y el aumento del nivel del mar.
  • * Los modelos actuales de la capa de hielo antártica a menudo descuidan el movimiento del agua superficial, subestimando el impacto del agua de deshielo.
  • * La comprensión de la hidrología superficial de toda la Antártida y su evolución es crucial pero limitada.

Objetivo del estudio:

  • * Cuantificar y comprender la naturaleza generalizada del drenaje del agua de deshielo superficial en la capa de hielo antártica.
  • * Investigar la escala y persistencia de los sistemas de drenaje superficial y los estanques de fusión.
  • * Evaluar el impacto potencial del aumento del drenaje superficial en la pérdida futura de masa de hielo.

Principales métodos:

  • * Análisis de imágenes satelitales históricas (desde 1973).
  • * Examen de la fotografía aérea (desde 1947 en adelante).
  • * Identificación y cartografía de las corrientes superficiales, los estanques y los sistemas de drenaje.

Principales resultados:

  • * Se observa un drenaje superficial generalizado en toda la capa de hielo antártica, que se extiende hasta 85° S y 1.300 m de altitud.
  • * Los sistemas de drenaje superficial han persistido durante décadas, transportando agua a largas distancias (hasta 120 km).
  • * Los grandes estanques de fusión (de hasta 80 km de largo) forman parte de estas extensas redes de drenaje.

Conclusiones:

  • * El drenaje de aguas de deshielo superficial es una característica significativa y de larga data de la capa de hielo antártica.
  • * El aumento del drenaje superficial en un clima cálido puede acelerar la pérdida de masa de hielo y el aumento del nivel del mar.
  • * Los hallazgos ponen de relieve la necesidad de incorporar la hidrología de superficie en los modelos de las capas de hielo para obtener predicciones precisas del aumento del nivel del mar.