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El volumen de hielo y el nivel del mar durante el último interglacial
1Research School of Earth Sciences, The Australian National University, 1 Mills Road, Canberra, ACT 0200, Australia. adutton@ufl.edu
Science (New York, N.Y.)
|July 17, 2012
Resumen
Los niveles mundiales del mar fueron significativamente más altos durante el último período interglacial, lo que indica una mayor sensibilidad de las capas de hielo al cambio climático. Esto sugiere que incluso un pequeño calentamiento podría causar un aumento sustancial del nivel del mar.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Investigación sobre el nivel del mar.
Sus antecedentes:
- El nivel del mar fue sustancialmente más alto durante el último período interglacial (hace unos 125.000 años).
- Existe un interés continuo en la dinámica de la capa de hielo de la Antártida Occidental durante este período.
- Los sitios geográficamente diversos muestran variabilidad en las observaciones máximas del nivel del mar.
Objetivo del estudio:
- Para evaluar las últimas observaciones interglaciales del nivel del mar.
- Proporcionar una base de datos internamente consistente de las edades U-Th de los corales.
- Evaluar los datos del nivel del mar en el contexto del modelado isostático y la evidencia estratigráfica.
Principales métodos:
- Compilación de las edades U-Th de los corales.
- Modelado isostático.
- Análisis de la evidencia estratigráfica. análisis de las evidencias estratigráficas.
Principales resultados:
- El nivel global del mar alcanzó un máximo de 5.5 a 9 metros por encima de los niveles actuales.
- Se deducen capas de hielo más pequeñas en Groenlandia y la Antártida en comparación con hoy.
- El nivel del mar muestra una alta sensibilidad a los cambios de forzamiento radiativo.
Conclusiones:
- La capa de hielo de la Antártida Occidental probablemente no se derrumbó por completo durante el último período interglacial.
- El aumento del nivel del mar en el pasado indica una respuesta significativa de la capa de hielo al forzamiento climático.
- Comprender los cambios pasados en el nivel del mar es crucial para predecir el comportamiento futuro de las capas de hielo y el aumento del nivel del mar.
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