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La ruptura de la última estratificación glacial profunda en el Pacífico Sur

Chandranath Basak¹, Henning Fröllje^2,3, Frank Lamy⁴

¹Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129 Oldenburg, Germany. cbasak@csub.edu.

Science (New York, N.Y.)

|February 24, 2018

Resumen

La estratificación en las profundidades del Océano Austral almacenó carbono durante el Último Máximo Glacial. El cambio climático del hemisferio sur más tarde causó que esta estratificación se rompiera, liberando CO2.

Área de la Ciencia:

Paleoceanografía
Ciencias del clima
Geoquímica marina

Sus antecedentes:

Se supone que la estratificación profunda del Océano Sur almacena carbono durante los períodos glaciales.
El desglose de esta estratificación durante la deglaciación está relacionado con el aumento del CO2 atmosférico.
Comprender los mecanismos de almacenamiento y liberación de carbono es crucial para el modelado climático.

Objetivo del estudio:

Para confirmar la estratificación de la columna de aguas profundas en el Pacífico Sur durante el Último Máximo Glacial.
Investigar el papel de las aguas abismales en los depósitos de carbono glaciales.
Para identificar los desencadenantes de la ruptura deglacial de la estratificación del Océano Sur.

Principales métodos:

Análisis de isótopos de neodimio de muestras de aguas profundas y abisales del Pacífico Sur.
Reconstrucción de los patrones de circulación oceánica del pasado.
Correlación de los datos isotópicos con los registros paleoclimáticos.

Principales resultados:

La evidencia de isótopos de neodimio confirma la estratificación de la columna de aguas profundas durante el último máximo glacial.
Se identificó la expansión hacia el norte del agua del fondo del mar de Ross durante la glaciación.
El cambio climático en el hemisferio sur se identificó como un desencadenante de la ruptura de la estratificación deglacial.

Conclusiones:

Las aguas abisales jugaron un papel clave en el mantenimiento de un depósito de carbono glacial profundo.
El cambio climático del hemisferio sur precedió a la desestabilización del océano profundo.
La liberación de CO2 deglacial fue facilitada por la ruptura de la estratificación y el posterior surgimiento.

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