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El forzamiento del agua dulce del cambio climático abrupto durante la última glaciación
P U Clark1, S J Marshall, G K Clarke
1Department of Geosciences, Oregon State University, Corvallis, OR 97333, USA. clarkp@ucs.orst.edu
Science (New York, N.Y.)
|July 14, 2001
Resumen
Las grandes fluctuaciones de las capas de hielo redirigieron el agua dulce, impactando la formación de aguas profundas del Atlántico Norte y causando variabilidad climática durante la última deglaciación.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- La última deglaciación se caracterizó por una dinámica significativa de las capas de hielo a escala milenaria.
- El margen sur de la capa de hielo Laurentide de América del Norte experimentó fluctuaciones sustanciales.
- Estas fluctuaciones ocurrieron entre aproximadamente 43° y 49° de latitud norte.
Objetivo del estudio:
- Para investigar el impacto de las fluctuaciones del margen de la capa de hielo de Laurentide en la paleoceanografía del Atlántico Norte.
- Comprender los mecanismos que impulsan la variabilidad climática durante la última deglaciación.
- Para explorar la relación entre los pulsos de agua dulce impulsados por las capas de hielo y la circulación oceánica.
Principales métodos:
- Análisis de datos paleoclimáticos proxy para reconstruir el comportamiento de la capa de hielo y las condiciones del océano.
- Reconstrucciones del margen de hielo basadas en evidencia geológica.
- Modelado oceanográfico para evaluar los impactos del flujo de agua dulce.
Principales resultados:
- Las fluctuaciones del margen de las capas de hielo aumentaron episódicamente la descarga de agua dulce al Atlántico Norte.
- La escorrentía continental fue desviada del drenaje del río Mississippi a los ríos Hudson o San Lorenzo.
- El aumento del flujo de agua dulce coincidió con la reducción de la formación de aguas profundas del Atlántico Norte.
Conclusiones:
- La dinámica de las capas de hielo influyó significativamente en la circulación del océano Atlántico Norte y el clima.
- Los pulsos de agua dulce de la fusión de las capas de hielo proporcionan un mecanismo para el cambio climático abrupto.
- Este mecanismo es probablemente característico de los períodos con un volumen global intermedio de hielo.
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