Reduciones rápidas en las aguas profundas del Atlántico Norte durante el pico del último período interglacial

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Eirik Vinje Galaasen¹, Ulysses S Ninnemann, Nil Irvalı

¹Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Allégaten 41, 5007 Bergen, Norway.

Science (New York, N.Y.)

|February 22, 2014

Resumen

La circulación oceánica durante los períodos interglaciales no siempre es estable. Los cambios en el agua dulce y el hielo pueden interrumpir el flujo de aguas profundas del Atlántico Norte (NADW, por sus siglas en inglés), impactando la química profunda del Atlántico.

Área de la Ciencia:

La paleoceanografía es la paleoceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima
Oceanografía La oceanografía es la oceanografía.

Sus antecedentes:

Se asume que la circulación oceánica profunda es estable durante los períodos interglaciales.
El comportamiento a escala submilenial de la circulación oceánica sigue siendo poco comprendido.

Objetivo del estudio:

Investigar la estabilidad de la circulación oceánica profunda en escalas de tiempo submilenarias durante el último período interglacial.
Para entender los impulsores de la variabilidad de las aguas profundas del Atlántico Norte (NADW).

Principales métodos:

Análisis de un registro epibéntrico foraminiferal δ(13) C subcentenariamente resuelto.
Correlación con el rafting sobre hielo y los datos de influencia de las aguas polares.

Principales resultados:

Fuerte influencia de NADW al comienzo del último período interglacial.
Se observaron reducciones a escala centenaria en el NADW.
Transientes NADW vinculados al aumento del rafting sobre hielo y la expansión de las aguas polares.
Cambios químicos en el Atlántico profundo comparables a los períodos glaciales.

Conclusiones:

La circulación interglacial de las profundidades oceánicas puede ser menos estable de lo que se pensaba.
Los cambios en el agua dulce y la criosfera pueden desencadenar inestabilidad convectiva en el Atlántico Norte.
Las condiciones más cálidas y frescas que las actuales pueden provocar cambios significativos en la circulación.

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