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Emisiones pulsadas de metano biogénico junto con el calentamiento episódico durante el evento anóxico oceánico de
Ruoyuan Qiu1,2, Zhichao Yu1, Benjamin J W Mills3
1Key Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Resumen
Los antiguos eventos de calentamiento liberaron metano masivo, contribuyendo al cambio climático. Este estudio cuantifica la liberación de metano biogénico durante el Evento Anóxico Oceánico Torciano, revelando su papel en el calentamiento pasado y las extinciones masivas.
Área de la Ciencia:
- Paleoclimatología
- Biogeoquímica
- Ciencias de la Tierra
Sus antecedentes:
- Comprender las dinámicas climáticas antiguas es crucial para predecir el cambio climático futuro.
- El evento anóxico oceánico de Toarcian (T-OAE) ofrece información sobre el calentamiento rápido y las perturbaciones del ciclo del carbono.
Objetivo del estudio:
- Investigar la escala de liberación de metano biogénico durante el T-OAE.
- Evaluar la contribución del metano a la variabilidad climática y la extinción masiva.
Principales métodos:
- Desarrolló un modelo biogeoquímico global.
- Inversión bayesiana aplicada con las simulaciones de la cadena de Markov Monte Carlo (MCMC).
- Se utilizaron datos de excursión de isótopos de carbono de alta resolución de la sección de Yorkshire.
Principales resultados:
- Se requiere una liberación de al menos 4.700 Gt de metano biogénico (δ13C de -50 a -70‰) para explicar los desplazamientos de isótopos de carbono observados.
- Esta liberación de metano probablemente aumentó las concentraciones atmosféricas de metano, causando un calentamiento global adicional de más de 2 °C.
- La liberación de metano fue facilitada por el aumento de la metanogénesis y la disminución de la oxidación del metano en entornos marinos.
Conclusiones:
- La liberación de metano biogénico actuó como una retroalimentación positiva significativa durante el T-OAE.
- El ciclo del metano exacerbó los cambios ambientales, contribuyendo a la extinción masiva de la vida marina.
- La reconstrucción de flujos de metano en el pasado mejora las predicciones del futuro ciclo del carbono y la dinámica climática.
Palabras clave:
Inversión BayesianaEvento anóxico oceánico de torcianoMetano biogénicoperturbación del ciclo del carbonoCalentamiento extremoMás Videos Relacionados
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