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Temperaturas medias globales del océano durante la última transición glacial

Bernhard Bereiter^1,2,3, Sarah Shackleton¹, Daniel Baggenstos^1,2

¹Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92037, USA.

|January 5, 2018

Resumen

Las temperaturas del océano aumentaron significativamente durante la última transición glacial. Este estudio utilizó gases nobles del núcleo de hielo para reconstruir los cambios de temperatura global del océano durante 10.000 años.

Área de la Ciencia:

Paleoclimatología
La oceanografía
Ciencias del clima

Sus antecedentes:

Existen datos limitados sobre las respuestas a largo plazo de la temperatura del océano al cambio climático.
El papel del océano en la absorción del calor antropogénico durante períodos prolongados sigue siendo incierto.

Objetivo del estudio:

Para reconstruir las temperaturas pasadas del océano global con alta precisión y resolución temporal.
Para investigar la relación entre la temperatura del océano, la temperatura de la Antártida y los niveles de CO2 atmosférico.
Para analizar los eventos de calentamiento abrupto en la historia climática de la Tierra.

Principales métodos:

Utilizó gases nobles conservados en núcleos de hielo para la reconstrucción del paleoclima.
Desarrolló un nuevo método para estimar la temperatura global integrada del océano.
Datos correlacionados de la temperatura del océano con la temperatura antártica y los registros de CO2 atmosférico.

Principales resultados:

La temperatura global del océano aumentó en 2.57 ± 0.24 ° C desde hace 20.000 a 10.000 años.
La temperatura del océano está estrechamente correlacionada con la temperatura de la Antártida, sin plomo o retraso en relación con el CO2 atmosférico.
Identificó un evento de calentamiento de 700 años durante el Dryas temprano que excede las estimaciones modernas de absorción de calor del océano.

Conclusiones:

El clima del hemisferio sur influye significativamente en las tendencias climáticas globales.
El análisis de gases nobles en núcleos de hielo proporciona un método robusto para la reconstrucción de la temperatura global del océano.
Los eventos de calentamiento abrupto en el océano en el pasado fueron sustanciales y ofrecen información sobre la sensibilidad climática.

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