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Cambios en la temperatura y circulación de las profundidades marinas en el Máximo Térmico Paleoceno-Eoceno.

Aradhna Tripati¹, Henry Elderfield

¹Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, UK. atri02@esc.cam.ac.uk

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|June 25, 2005

Resumen

El calentamiento global durante el Máximo Térmico Paleoceno-Eoceno (PETM) se relacionó con los gases de efecto invernadero. Los cambios en la circulación oceánica, particularmente en el Pacífico Norte, probablemente desencadenaron la liberación de metano y el calentamiento sostenido.

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Área de la Ciencia:

La paleoceanografía es la paleoceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
La geoquímica es la geoquímica.

Sus antecedentes:

El Máximo Térmico Paleoceno-Eoceno (PETM) fue un período de rápido calentamiento global.
Los niveles elevados de gases de efecto invernadero son el presunto conductor del calentamiento del PETM.

Objetivo del estudio:

Investigar las condiciones oceanográficas y los patrones de circulación durante el PETM.
Para determinar los desencadenantes de la liberación de hidrato de metano y el calentamiento sostenido.

Principales métodos:

Análisis de las proporciones foraminiferales de magnesio/calcio para reconstruir temperaturas oceánicas pasadas.
Reconstrucción de los patrones de circulación oceánica a través de proxies isotópicos y geoquímicos.

Principales resultados:

Las aguas de fondo se calientan entre 4 y 5 °C, lo que coincide con las aguas superficiales tropicales, sin amplificación en latitudes altas.
Las aguas intermedias se calentaron antes de la excursión del isótopo de carbono.
La evidencia sugiere que el descenso del Pacífico Norte y la reducción de la convección del Océano Sur precedieron a la liberación de metano.

Conclusiones:

Los cambios en la circulación oceánica, específicamente en el Pacífico Norte, probablemente desencadenaron la liberación de hidrato de metano.
Un cambio a la convección profunda del Pacífico Norte en el inicio del PETM puede haber amplificado y sostenido el calentamiento global.