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Evolución de la atmósfera y los océanos
H D Holland1, B Lazar, M McCaffrey
1Department of Geological Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|March 6, 1986
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias de la atmósfera Ciencias atmosféricas.
- Paleoclimatología Paleoclimatología
Sus antecedentes:
- Los constituyentes atmosféricos y oceánicos están en equilibrio dinámico.
- Las actuales actividades humanas están perturbando gravemente estos equilibrios naturales.
- Las condiciones pasadas de la Tierra diferían significativamente de las actuales.
Objetivo del estudio:
- Para investigar la química atmosférica y oceánica del pasado.
- Comprender el impacto de la biosfera en la evolución atmosférica.
- Para evaluar la gravedad de las actuales perturbaciones antropogénicas.
Principales métodos:
- Análisis de la mineralogía de los evaporitos marinos.
- Examen de la química antigua del suelo.
- Reconstrucción de la composición paleo-atmosférica.
Principales resultados:
- La composición del agua de mar ha sido estable durante al menos 900 millones de años (Myr).
- Las atmósferas antiguas (hace más de 1.000 millones de años) tenían más CO2 y menos O2.
- El peróxido de hidrógeno y el formaldehído fueron probablemente los principales agentes redox en el agua de lluvia temprana.
Conclusiones:
- La evolución de la biosfera está fuertemente vinculada a los principales cambios químicos atmosféricos desde hace 1.000 millones de años.
- Las perturbaciones actuales en los equilibrios dinámicos de la Tierra no tienen precedentes.
- Comprender los cambios pasados es crucial para evaluar las futuras alteraciones climáticas y atmosféricas.
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