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Glaciación escandinava, siberiana y del Océano Ártico: efecto de las variaciones de CO2 atmosférico del Holoceno
Science (New York, N.Y.)
|August 11, 1989
Resumen
Las capas de hielo del Pleistoceno en el Ártico euroasiático avanzaron y retrocedieron debido a los cambios en el dióxido de carbono (CO2) atmosférico. Por debajo de 250 ppm de CO2, se formó una gran capa de hielo; el calentamiento la derrumbó, restaurando las condiciones actuales del hielo.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Modelado del clima Modelado del clima
Sus antecedentes:
- El comportamiento de las capas de hielo del Pleistoceno en el Ártico euroasiático es complejo.
- Comprender los impulsores del avance y retroceso de la capa de hielo es crucial para predecir futuros escenarios climáticos.
Objetivo del estudio:
- Evaluar el papel de los cambios en la concentración de dióxido de carbono (CO2) atmosférico en el avance y retroceso de las capas de hielo del Pleistoceno en el Ártico euroasiático.
- Para determinar el umbral de CO2 para la formación y el colapso extensos de la capa de hielo.
Principales métodos:
- Utilizó un modelo de computadora que simula la dinámica acoplada de la capa de hielo y la plataforma de hielo.
- Se realizaron simulaciones con diferentes concentraciones de CO2 atmosférico.
Principales resultados:
- Una capa de hielo de base marina que cubre los mares de Barents, Kara y Siberia Oriental, y partes del Océano Ártico se formó por debajo de un umbral de CO2 de aproximadamente 250 partes por millón.
- El calentamiento climático vinculado al aumento del CO2 atmosférico en el Holoceno fue suficiente para causar el colapso de esta extensa glaciación.
Conclusiones:
- Los cambios observados en la concentración de CO2 atmosférico son un conductor plausible para el avance y retroceso de las capas de hielo del Pleistoceno en el Ártico euroasiático.
- El modelo simula con éxito el colapso de una gran capa de hielo y la restauración de las condiciones actuales del hielo debido al calentamiento inducido por el CO2.
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