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La bomba de carbono mejorada se deduce de la relajación de la limitación de nutrientes en el océano glacial
L E Pichevin1, B C Reynolds, R S Ganeshram
1School of Geosciences, Grant Institute, University of Edinburgh, West Main Road, EH10 3JW, Edinburgh, UK. laetitia.pichevin@ed.ac.uk
Nature
|June 26, 2009
Resumen
La fertilización de hierro en el Océano Pacífico Ecuatorial Oriental impulsó la productividad primaria durante los períodos glaciales. Esto mejoró la bomba de carbono biológica, ayudando a reducir los niveles de dióxido de carbono atmosférico.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Biogeoquímica La biogeoquímica es la bioquímica.
- Geología marina Geología marina.
Sus antecedentes:
- El Océano Pacífico Ecuatorial Oriental (EEP) es una fuente significativa de carbono atmosférico.
- La productividad primaria EEP moderna está limitada por el ácido silícico y el hierro, lo que dificulta la exportación de carbono.
- La entrega de hierro glacial puede haber aumentado la productividad y la exportación de carbono, reduciendo el CO2.
Objetivo del estudio:
- Investigar el papel de la EEP en la extracción de dióxido de carbono glacial.
- Aclarar el impacto de la fertilización de hierro en la sílice de diatomeas y la absorción de carbono.
- Reevaluar la contribución de la EEP a la dinámica del ciclo de carbono glacial.
Principales métodos:
- Análisis de un nuevo registro de isótopos de silicio del EEP.
- Examen de los cambios de los isótopos de silicio y nitrógeno.
- Interpretación de las tasas de enterramiento de carbono orgánico y de acumulación de ópalo.
Principales resultados:
- Un nuevo registro de isótopos de silicio sugiere la absorción reducida de silicio a carbono por las diatomeas en el EEP glacial.
- Esta paradoja se explica por el aumento de la disponibilidad de hierro de la entrada de polvo.
- La productividad del EEP glacial no estaba limitada por el hierro, el silicio o el nitrógeno.
Conclusiones:
- El EEP probablemente tuvo una bomba de carbono biológica vigorizada durante el último período glacial.
- Esta bomba mejorada contribuyó a la reducción del dióxido de carbono atmosférico.
- La limitación de fósforo puede haber limitado las bombas de carbono biológicas glaciales en océanos de bajas latitudes.
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