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Disminución de la estabilidad de los hidratos de metano en los sedimentos marinos debido a la rugosidad del límite de
W T Wood1, J F Gettrust, N R Chapman
1US Naval Research Laboratory, Stennis Space Center, Mississippi 39529, USA. warren.wood@nrlssc.navy.mil
Nature
|December 13, 2002
Resumen
Los depósitos de hidrato de metano marino, cruciales para la estabilidad y la energía del fondo marino, muestran bases más ásperas donde los fluidos escapan. Esto sugiere que más hidrato está cerca de la inestabilidad, lo que afecta a los modelos de cambio global.
Área de la Ciencia:
- Geología Geología Geología.
- La geociencia marina es la geología marina.
- La geofísica es la geofísica.
Sus antecedentes:
- Los depósitos de hidrato de metano son vastas reservas de carbono que influyen en la estabilidad del fondo marino y el cambio global.
- Las imágenes sísmicas suelen identificar la base de la zona de estabilidad de hidrato de metano como un reflector paralelo y liso.
- Estos depósitos representan un recurso energético potencial.
Objetivo del estudio:
- Para investigar las variaciones laterales en la base de la zona de estabilidad de hidratos.
- Comprender las implicaciones de la expulsión de fluidos del fondo marino en la distribución y estabilidad del hidrato de metano.
Principales métodos:
- Análisis de secciones sísmicas de alta resolución de sedimentos del fondo marino.
- Observación de sedimentos del fondo marino en el margen de Cascadia, frente a la isla de Vancouver, Canadá.
Principales resultados:
- Se observaron variaciones laterales en la base de la zona de estabilidad del hidrato.
- Intrusiones verticales ricas en gas identificadas en la zona de estabilidad del hidrato, vinculadas al flujo ascendente del fluido.
- Se encontró que la expulsión de fluidos del fondo marino crea una base más áspera de la zona de estabilidad de hidratos con mayor área de superficie.
Conclusiones:
- La base de la zona de estabilidad del hidrato no siempre es lisa y puede alterarse significativamente por la expulsión de fluidos.
- El aumento de la superficie del hidrato de metano cerca de la base implica un mayor potencial de disociación debido a los cambios de presión (por ejemplo, la caída del nivel del mar).
- Los hallazgos tienen implicaciones para comprender la liberación de metano, la estabilidad del fondo marino y el cambio climático.
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