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Un "invernadero" mesozoica terminal: lecciones del pasado
Science (New York, N.Y.)
|August 4, 1978
Resumen
El calentamiento global causado por el dióxido de carbono desencadenó las extinciones finales del Mesozoico. Este antiguo evento, impulsado por las condiciones de invernadero, ofrece paralelos con el cambio climático moderno de las actividades humanas como la quema de combustibles fósiles.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Paleontología Paleontología.
- La geoquímica es la geoquímica.
Sus antecedentes:
- El final de la Era Mesozoica concluyó con extinciones masivas, impactando la vida marina y terrestre.
- Investigaciones anteriores indicaron vínculos potenciales entre el cambio climático y estos eventos de extinción.
Objetivo del estudio:
- Para investigar el papel del calentamiento global inducido por el dióxido de carbono en las últimas extinciones de Maestrichtian.
- Analizar las tendencias climáticas y su impacto en los ecosistemas del Mesozoico.
Principales métodos:
- Análisis de rocas del Mesozoico tardío y registros de vida.
- Interpretación de datos de isótopos de oxígeno de microfósiles marinos para reconstruir el clima pasado.
Principales resultados:
- La evidencia sugiere que el calentamiento global a corto plazo (10^510^6 años) ocurrió en el Maestrichtiano tardío debido a las condiciones de invernadero.
- Los datos de isótopos de oxígeno revelan una tendencia de enfriamiento a mediados del Maastrichtiano seguido de un calentamiento en el Cenozoico.
- Los organismos marinos, particularmente los pequeños calcáreos, se vieron afectados negativamente por las aguas enriquecidas con CO2, afectando a las redes alimentarias.
Conclusiones:
- El calentamiento repentino después de un período de enfriamiento abrumó las adaptaciones de los animales, contribuyendo a las extinciones.
- La liberación de CO2 en las profundidades oceánicas puede haber amplificado el calentamiento, creando un circuito de retroalimentación.
- Las actividades humanas modernas, como la combustión de combustibles fósiles y la deforestación, podrían replicar estas condiciones de calentamiento del pasado.
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