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Inestabilidad interglacial de la ventilación de aguas profundas del Atlántico Norte

Eirik Vinje Galaasen¹, Ulysses S Ninnemann², Augustin Kessler³

¹Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway. eirik.galaasen@uib.no.

Science (New York, N.Y.)

|March 29, 2020

Resumen

Las interrupciones en la ventilación de aguas profundas del Atlántico Norte (NADW) han sido comunes durante los interglaciales, y no requieren condiciones extremas. Las reducciones pasadas de NADW ocurrieron bajo varios climas, lo que sugiere una interrupción más fácil de lo que se pensaba anteriormente.

Área de la Ciencia:

Paleoceanografía
Ciencias del clima
La oceanografía

Sus antecedentes:

La ventilación en aguas profundas del Atlántico Norte (NADW, por sus siglas en inglés) es crucial para la regulación climática mundial.
Comprender la estabilidad de NADW es vital para las proyecciones climáticas precisas.
Los períodos interglaciales pasados ofrecen información sobre los posibles cambios climáticos.

Objetivo del estudio:

Evaluar la frecuencia y los desencadenantes climáticos de las grandes reducciones de las aguas profundas del Atlántico Norte (NADW, por sus siglas en inglés) durante los últimos interglaciales.
Determinar si las inundaciones catastróficas de agua dulce son necesarias para las perturbaciones significativas de NADW.
Evaluar la susceptibilidad del NADW a las perturbaciones en diversas condiciones climáticas interglaciales.

Principales métodos:

Análisis de los registros del núcleo de aguas profundas resueltos (sub) centenariamente.
Reconstrucción del agua de fondo δ 13 C (un sustituto de la circulación de NADW) durante los últimos 0,5 millones de años.
Correlación de los cambios de NADW con los datos paleoclimáticos de los períodos interglaciales.

Principales resultados:

Las grandes reducciones en NADW han sido características frecuentes y a veces prolongadas de los períodos interglaciales.
Las interrupciones de NADW ocurrieron en un espectro de antecedentes climáticos interglaciales.
La evidencia sugiere que las grandes inundaciones por explosión de agua dulce no son requisitos previos para perturbaciones sustanciales de NADW.

Conclusiones:

Las interrupciones de NADW a gran escala se desencadenan más fácilmente de lo que se entendía anteriormente.
Las condiciones climáticas interglaciales similares a las proyectadas para el futuro pueden conducir a un debilitamiento significativo de NADW.
El comportamiento pasado de NADW indica una mayor sensibilidad al cambio de lo que se asume comúnmente, con implicaciones para la estabilidad climática futura.

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