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Phasing de la variabilidad del clima a escala milenaria en los océanos Pacífico y Atlántico
Maureen H Walczak1,2, Alan C Mix3, Ellen A Cowan4
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. mo.walczak@oregonstate.edu.
Science (New York, N.Y.)
|October 2, 2020
Resumen
La ventilación del Océano Pacífico y la descarga de la capa de hielo de la Cordillera ocurrieron juntos durante los últimos 42.000 años. Esto sugiere que el Pacífico, no el Atlántico, inició los eventos climáticos que afectan al globo.
Área de la Ciencia:
- Paleoclimatología
- La oceanografía
- Glaciología
Sus antecedentes:
- Las dinámicas climáticas a escala milenaria son complejas, e implican interacciones entre las capas de hielo y la circulación oceánica.
- La ventilación de agua intermedia del Pacífico Norte está relacionada con la fuerza del monzón asiático y las influencias climáticas de baja latitud.
- Se debate el momento de la descarga de la capa de hielo de la Cordillera en relación con los eventos climáticos del Atlántico Norte como los eventos de Heinrich.
Objetivo del estudio:
- Para investigar la relación sincrónica entre la ventilación del Océano Pacífico y la descarga de la capa de hielo de la Cordillera en los últimos 42.000 años.
- Para determinar el papel del Océano Pacífico en el inicio de cambios climáticos a gran escala.
- Aclarar los mecanismos desencadenantes del retroceso de las capas de hielo y sus implicaciones globales.
Principales métodos:
- La datación por radiocarbono de núcleos de sedimentos del Golfo de Alaska.
- Análisis sedimentológico para identificar los escombros de las balsas de hielo.
- Las reconstrucciones paleoceanográficas de la ventilación de agua intermedia.
Principales resultados:
- Se identificaron episodios recurrentes a escala milenaria de ventilación reorganizada en el Océano Pacífico.
- Estos eventos de ventilación coincidieron con la rápida descarga de la capa de hielo de la Cordillera.
- Los cambios en la edad del carbono-14 del agua intermedia del Pacífico Norte precedieron a la capa de hielo de Laurentide (eventos de Heinrich).
Conclusiones:
- Hay una estrecha conexión entre la ventilación del Océano Pacífico y la dinámica de la capa de hielo de la Cordillera en los últimos 42.000 años.
- El Océano Pacífico, no el Atlántico, parece ser un conductor temprano en una cascada de eventos climáticos globales.
- Estos hallazgos ponen de relieve el papel crucial del Pacífico en la variabilidad paleoclimática y las teleconexiones.
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