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Las turberas siberianas son un sumidero neto de carbono y una fuente global de metano desde el Holoceno temprano
L C Smith1, G M MacDonald, A A Velichko
1Department of Geography, University of California, Los Angeles, CA 90095-1524, USA. lsmith@geog.ucla.edu
Science (New York, N.Y.)
|January 17, 2004
Resumen
Las turberas del Holoceno temprano en Siberia Occidental se convirtieron en una importante fuente de metano del hemisferio norte, almacenando carbono significativo y actuando como un sumidero de CO2. Este hallazgo tiene un impacto en nuestra comprensión de la dinámica climática pasada.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La geoquímica es la geoquímica.
- Ecología Ecología Ecología.
Sus antecedentes:
- Los datos de núcleos de hielo revelan un aumento significativo de metano en el Holoceno temprano.
- El papel de las tierras bajas de Siberia Occidental en este aumento de metano no ha sido claro.
Objetivo del estudio:
- Para investigar el momento y la escala del desarrollo de las turberas en Siberia Occidental.
- Para cuantificar las reservas de carbono y el intercambio de gases en esta región durante el Holoceno temprano.
Principales métodos:
- Análisis de extensos datos de las tierras bajas de Siberia Occidental.
- Comparación del tiempo de establecimiento de las turberas con los datos de metano atmosférico y los gradientes interpolares de metano (IPG).
Principales resultados:
- El establecimiento generalizado de turberas se produjo entre hace 11.5 y 9 mil años.
- Las reservas de carbono se estiman en 70,2 Petagramas, lo que representa una parte sustancial de la acumulación de carbono posglacial.
- La mínima evidencia de oxidación catastrófica sugiere un papel de sumidero de carbono a largo plazo para el CO2.
Conclusiones:
- Las tierras bajas de Siberia Occidental surgieron como una importante fuente de metano del Holoceno temprano.
- La región ha funcionado como un sumidero de dióxido de carbono a largo plazo desde el inicio del Holoceno.
- Estos hallazgos refinan nuestra comprensión del ciclo global del carbono y la dinámica del metano.
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