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Origen del Océano Austral para la reanudación de la circulación termohalina del Atlántico durante la deglaciación
1Institut für Meteorologie, Universität Hamburg, Bundesstrasse 55, 20146 Hamburg, Germany. gregor.knorr@dkrz.de
Nature
|August 2, 2003
Resumen
El calentamiento del Océano Sur, no el agua de deshielo, inició el fortalecimiento de la circulación atlántica durante la desglaciación. Este hallazgo concilia los cambios climáticos del hemisferio norte y sur, lo que explica el retorno a las condiciones interglaciales.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Modelado del clima Modelado del clima
Sus antecedentes:
- Las deglaciaciones muestran que el calentamiento del hemisferio sur precede al calentamiento de Groenlandia.
- Se cree que la descarga de agua de deshielo en el Atlántico Norte inhibe la formación de aguas profundas.
- La circulación termohalina atlántica (THC) se fortaleció durante la deglaciación, pasando de los modos glaciales a los interglaciales.
Objetivo del estudio:
- Investigar la influencia del calentamiento del Océano Antártico y el retroceso del hielo marino en el THC del Atlántico.
- Determinar el factor dominante del fortalecimiento del THC durante la deglaciación.
Principales métodos:
- Utilizó un modelo tridimensional de la circulación oceánica.
- Simula el calentamiento gradual del Océano Sur y el retroceso asociado del hielo marino.
Principales resultados:
- El calentamiento del Océano Antártico desencadenó una reanudación abrupta del modo THC interglacial.
- El aumento del transporte masivo hacia el Atlántico a través de los océanos Índico y Pacífico fue clave.
- Este efecto de calentamiento contrarrestó y superó la influencia opuesta de la descarga de agua de deshielo.
Conclusiones:
- El calentamiento del Océano Antártico actúa como un disparador para el modo interglacial de THC.
- Este mecanismo proporciona una explicación unificada para los cambios climáticos hemisféricos durante la deglaciación.
- Los hallazgos se alinean con los registros proxy paleoclimáticos existentes.
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