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La desgasificación tectónica impulsó las tendencias de la temperatura global desde hace 20 Ma
Timothy D Herbert1, Colleen A Dalton1, Zhonghui Liu2
1DEEPS, Brown University, Providence, RI 02912, USA.
Science (New York, N.Y.)
|June 30, 2022
Resumen
El Óptimo Climático del Mioceno vio temperaturas globales más cálidas debido al aumento de la actividad tectónica. Este estudio vincula la producción de corteza oceánica con los cambios climáticos, explicando los cambios de temperatura a largo plazo.
Área de la Ciencia:
- Paleoclimatología
- La geofísica
- La oceanografía
Sus antecedentes:
- El Óptimo Climático del Mioceno (~ 17-14 Ma) fue un período cálido que interrumpió el enfriamiento del Cenozoico.
- Las temperaturas globales durante esta época fueron significativamente más cálidas que hoy (~ 10 ° C).
Objetivo del estudio:
- Investiga los impulsores del óptimo climático del Mioceno.
- Reconstruir la producción de la corteza oceánica en el pasado como un sustituto de la desgasificación tectónica del carbono.
- Correlación de la actividad tectónica con las tendencias de la temperatura global.
Principales métodos:
- Registros de paleotemperatura marinos sintetizados.
- Desarrolló una reconstrucción global de alta resolución de la producción de la corteza oceánica.
- Analizó la relación entre las tasas de producción de la corteza y la evolución de la temperatura global.
Principales resultados:
- Las tasas de producción de la corteza oceánica fueron ~ 35% más altas que las tasas modernas hasta ~ 14 Ma.
- Una fuerte disminución en la producción de corteza después de ~ 14 Ma coincidió con la caída de las temperaturas globales.
- Los cambios inferidos en la desgasificación tectónica explican los principales cambios climáticos a largo plazo desde 20 Ma.
Conclusiones:
- La desgasificación tectónica influyó significativamente en el clima del Mioceno.
- Los cambios en la producción de la corteza oceánica son un impulsor principal de la temperatura global a largo plazo y la evolución de las capas de hielo.
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