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Posible calentamiento polar inducido por el metano en el Eoceno temprano
L C Sloan1, J C Walker, T C Moore
1Department of Geological Sciences, University of Michigan, Ann Arbor 48109-1063.
Nature
|May 28, 1992
Resumen
El calor polar del Eoceno temprano puede explicarse por el aumento de las emisiones de metano. Este potente gas de efecto invernadero podría haber alimentado el calentamiento global y evitado el enfriamiento polar a través de nubes de hielo estratosférico.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Química de la atmósfera La química de la atmósfera
Sus antecedentes:
- Las reconstrucciones climáticas del Eoceno temprano muestran regiones y océanos polares cálidos, con heladas raras.
- Las temperaturas de la superficie del mar tropical eran similares o más frías que las actuales.
- El mecanismo para el calentamiento polar sin un calentamiento tropical significativo sigue sin explicarse.
Objetivo del estudio:
- Para investigar el papel de las emisiones de metano en el clima del Eoceno temprano.
- Para resolver la paradoja de los polos cálidos y los trópicos más fríos.
Principales métodos:
- Análisis de las zonas de humedales del Eoceno temprano.
- Modelado del impacto de las concentraciones elevadas de metano en el clima global y polar.
Principales resultados:
- Las estimaciones sugieren un flujo de metano sustancialmente mayor durante el Eoceno.
- Las elevadas concentraciones de metano probablemente aumentaron el calentamiento global del Eoceno temprano.
- El metano puede haber evitado el enfriamiento del invierno polar al promover nubes de hielo estratosférico.
Conclusiones:
- El aumento de las emisiones de metano ofrece una explicación plausible para el calor polar del Eoceno temprano.
- El papel del metano en la formación de nubes de hielo estratosférico es clave para la regulación del clima polar.
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