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pH del agua de mar del eoceno medio y las concentraciones de dióxido de carbono atmosférico

Pearson¹, Palmer

¹Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK. T. H. Huxley School, Royal School of Mines, Imperial College, Prince Consort Road, London SW7 2BP, UK.

Science (New York, N.Y.)

|June 12, 1999

Resumen

Los niveles de dióxido de carbono atmosférico influyen en el pH del océano. El análisis de los isótopos de boro en antiguos fósiles de plancton revela el pH del océano Pacífico del Eoceno medio, lo que sugiere que las concentraciones de dióxido de carbono eran similares a las actuales.

Área de la Ciencia:

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

Sus antecedentes:

La presión parcial atmosférica de dióxido de carbono (pCO2) influye en la química de la superficie del océano y el pH del agua de mar.
El pH del agua de mar es un factor crítico en los ecosistemas marinos y el ciclo global del carbono.
Comprender los niveles pasados de CO2 atmosférico es crucial para predecir el cambio climático futuro.

Objetivo del estudio:

Para reconstruir el perfil de profundidad de pH del Océano Pacífico tropical del Eoceno medio.
Para estimar los niveles atmosféricos de pCO2 durante la época del Eoceno medio.
Para evaluar la relación entre el CO2 atmosférico y el pH del océano en un escenario climático pasado.

Principales métodos:

Utilizando la composición isotópica de boro (delta11B) de los fósiles planctónicos foraminíferos.
Analizando foraminíferos que se calcificaron en varias profundidades de agua para establecer un perfil de pH de profundidad.
Aplicación de proxies geoquímicos a antiguos núcleos de sedimentos marinos del Pacífico tropical.

Principales resultados:

Se construyó con éxito un perfil detallado de profundidad de pH para el Pacífico tropical del Eoceno medio.
El estudio indica que el pH del agua de mar varió con la profundidad durante este período.
Se encontró que los niveles de pCO2 atmosféricos reconstruidos eran comparables o ligeramente superiores a las concentraciones actuales.

Conclusiones:

El proxy del isótopo de boro es eficaz para reconstruir antiguos perfiles de pH del océano.
Los niveles atmosféricos de pCO2 del Eoceno Medio eran similares a los niveles modernos, a pesar de las diferentes condiciones globales.
Esta investigación proporciona información valiosa sobre la relación a largo plazo entre el dióxido de carbono y el pH del océano.

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