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Transición a la inestabilidad de los acantilados de hielo marino controlada por gradientes de espesor y velocidad del
J N Bassis1, B Berg2,3, A J Crawford4
1Department of Climate and Space Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA. jbassis@umich.edu.
Science (New York, N.Y.)
|June 18, 2021
Resumen
La inestabilidad de los acantilados de hielo marino puede causar un retiro catastrófico de la capa de hielo. Sin embargo, la dinámica del hielo y las fuerzas del hielo marino pueden ralentizar o detener este colapso, incluso para glaciares vulnerables como Thwaites.
Área de la Ciencia:
- Glaciología
- Ciencias del clima
- La oceanografía
Sus antecedentes:
- Las capas de hielo a tierra por debajo del nivel del mar son susceptibles a la desintegración.
- La inestabilidad del acantilado de hielo marino (MICI) puede causar un rápido retroceso de la capa de hielo.
- Las secciones de la capa de hielo de la Antártida Occidental enfrentan un colapso potencial en escalas de tiempo de una década a un siglo.
Objetivo del estudio:
- Para investigar la dinámica de la inestabilidad del acantilado de hielo marino.
- Para modelar los factores que influyen en el colapso y la retirada de los acantilados de hielo.
- Evaluar los posibles mecanismos de estabilización contra el colapso de las capas de hielo.
Principales métodos:
- Utilizó un modelo numérico que simula el flujo y la fractura del hielo.
- Analizó el impacto de las variaciones de espesor del hielo en la estabilidad del acantilado.
- Las fuerzas de resistencia incorporadas del hielo marino y los escombros de hielo.
Principales resultados:
- El adelgazamiento dinámico puede desacelerar o estabilizar el retroceso del acantilado de hielo.
- El rápido aumento del espesor del hielo aguas arriba puede desencadenar un colapso catastrófico.
- El hielo marino y los escombros pueden impedir la retirada, mitigando el colapso sostenido de la capa de hielo.
Conclusiones:
- El colapso de la capa de hielo no es inevitable, incluso con MICI.
- Las fuerzas estabilizadoras pueden reducir el riesgo de pérdida generalizada de hielo.
- Comprender estas dinámicas es crucial para predecir el aumento futuro del nivel del mar.
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