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Variabilidad interdecadal desde la preindustrial hasta la moderna en el pH de los arrecifes de coral
Carles Pelejero1, Eva Calvo, Malcolm T McCulloch
1Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. pelejero@cmima.csic.es
Science (New York, N.Y.)
|October 1, 2005
Resumen
La acidificación de los océanos, impulsada por la absorción de dióxido de carbono, plantea riesgos para la vida marina. Los ciclos naturales de pH, vinculados a los patrones climáticos, pueden influir en la forma en que los arrecifes de coral se adaptan a estos cambios.
Área de la Ciencia:
- Biología Marina Biología Marina.
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- Los océanos absorben el dióxido de carbono atmosférico, lo que lleva a un aumento de la acidez.
- El impacto de la acidificación de los océanos en los ecosistemas marinos, en particular los arrecifes de coral, sigue siendo incierto.
- Comprender la variabilidad natural del pH del agua de mar es crucial para evaluar la adaptabilidad de las especies.
Objetivo del estudio:
- Para determinar la variabilidad natural del pH del agua del arrecife.
- Para investigar la relación entre los ciclos naturales de pH y las oscilaciones climáticas.
Principales métodos:
- Análisis de las composiciones isotópicas del boro en un coral masivo de Porites de 300 años de antigüedad.
- Reconstrucción de las variaciones pasadas del pH del agua de mar.
Principales resultados:
- Se observaron variaciones significativas de pH durante aproximadamente ciclos de 50 años.
- Estos ciclos de pH se correlacionan con la Oscilación Interdecadal del Pacífico (IPO) de las anomalías océano-atmósfera.
- La variabilidad natural del pH puede modular significativamente los efectos de la acidificación de los océanos.
Conclusiones:
- Los ecosistemas de arrecifes de coral experimentan fluctuaciones naturales del pH influenciadas por los patrones climáticos.
- Estos ciclos naturales son importantes para comprender la resiliencia de los arrecifes de coral a la acidificación oceánica en curso.
- Se necesita más investigación para comprender completamente la interacción entre la variabilidad natural y los impactos antropogénicos en los entornos marinos.
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