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Condiciones físicas en la base de una corriente de hielo antártico en rápido movimiento
Science (New York, N.Y.)
|April 6, 1990
Resumen
La capa de hielo de la Antártida Occidental es la capa de hielo de la Antártida Occidental.
Área de la Ciencia:
- Glaciología y Ciencias del Clima.
- Investigación antártica y dinámica del hielo.
Sus antecedentes:
- Las corrientes de hielo son componentes críticos de la estabilidad de la capa de hielo.
- Comprender las condiciones basales es clave para predecir el comportamiento de la capa de hielo.
Objetivo del estudio:
- Para investigar las condiciones basales de la corriente de hielo B en la capa de hielo de la Antártida Occidental.
- Para determinar los mecanismos que impulsan el movimiento rápido de la corriente de hielo.
Principales métodos:
- Perforación de pozos de perforación a la base del hielo.
- Medición de la presión y temperatura del agua basal.
Principales resultados:
- La base de hielo está en el punto de fusión.
- La presión de agua basal está cerca de la presión de sobrecarga (dentro de 1,6 bares).
- Una gruesa capa de sedimentos no consolidados subyace al hielo.
Conclusiones:
- Estas condiciones basales facilitan el rápido flujo de hielo a través del deslizamiento basal o la deformación del sedimento.
- La mecánica de las corrientes de hielo es crucial para comprender las respuestas de las capas de hielo al cambio climático.
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