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Grandes gradientes delta13C en el Atlántico Norte preindustrial fueron revelados
1Uni Bjerknes Centre, Allégaten 55, N-5007 Bergen, Norway. are.olsen@uni.no
Science (New York, N.Y.)
|October 30, 2010
Resumen
La corrección de los cambios de carbono causados por el hombre revela datos de isótopos de carbono del océano prístino. Estos datos revisados ofrecen una visión más clara de la circulación oceánica pasada y la variabilidad climática.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- La geoquímica marina es la geoquímica marina.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La composición isotópica del carbono (δ(13) C) en foraminiferos fósiles es clave para comprender la ventilación oceánica pasada.
- El δ(13) C del océano moderno se ve alterado por el dióxido de carbono antropogénico, lo que complica las interpretaciones históricas.
- El registro del Atlántico Norte (NA) δ(13) C está particularmente afectado por el efecto C-13 Suess.
Objetivo del estudio:
- Para corregir el efecto C-13 Suess en el Atlántico Norte.
- Para revelar la distribución prístina de δ(13) C en el Atlántico Norte.
- Reevaluar las diferencias de temperatura entre los océanos glaciales e interglaciales y su relación con las masas de agua.
Principales métodos:
- Análisis de la composición isotópica del carbono ((13) C/(12) C) en fósiles de foraminiferos.
- Aplicación de una corrección para el efecto oceánico C-13 Suess en el Atlántico Norte.
- Comparación de los datos corregidos de δ(13) C con las distribuciones de masa de agua modernas.
Principales resultados:
- La distribución original corregida del Atlántico Norte δ(13) C muestra una estructura más detallada.
- Esta estructura muestra una relación más clara con las distribuciones de masas de agua de lo que se entendía anteriormente.
- Se revisan las percepciones fundamentales de las diferencias glaciales-interglaciales del océano δ(13) C.
Conclusiones:
- El efecto C-13 Suess tiene un impacto significativo en las interpretaciones de los isótopos de carbono oceánicos del pasado.
- Los datos de Pristine δ(13) C proporcionan un marco más preciso para comprender la ventilación oceánica.
- Las variaciones paleo-δ(13) C pueden entenderse mejor en el contexto de la variabilidad climática moderna.
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