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La intemperie inversa como estabilizador a largo plazo del pH marino y el clima planetario
Terry T Isson1, Noah J Planavsky2
1Department of Geology and Geophysics, Yale University, New Haven, CT, USA. terry.t.isson@gmail.com.
Nature
|August 10, 2018
Resumen
La Tierra temprana
Área de la Ciencia:
- Geoquímica
- Paleoclimatología
- La oceanografía
Sus antecedentes:
- El clima temprano de la Tierra era cálido y estable a pesar de la menor luminosidad solar.
- El mantenimiento de altos niveles de dióxido de carbono atmosférico (CO2) es clave para este calor.
- Se debaten las teorías existentes sobre la regulación del CO2.
Objetivo del estudio:
- Investigar el papel de los procesos marinos en la regulación del clima de la Tierra temprana.
- Explore cómo el pH del océano influyó en el ciclo del carbono y el CO2 atmosférico.
- Identificar los mecanismos que mantuvieron un mundo Precámbrico estable y libre de hielo.
Principales métodos:
- Utilizó un modelo global del ciclo del carbono.
- Simuló la evolución del pH marino y su impacto en la partición de carbono.
- Se analizó la influencia de la formación autogénica de arcilla (cambio climático inverso) en la alcalinidad y la acidez.
Principales resultados:
- Las altas tasas de "climatización inversa" aumentaron la retención de carbono en el sistema océano-atmósfera.
- Este proceso condujo a niveles atmosféricos de CO2 más altos.
- Una retroalimentación negativa entre el pH marino y la formación autogénica de arcilla estabilizó el clima.
Conclusiones:
- El cambio climático inverso, particularmente en los primeros océanos ricos en sílice, mantuvo un clima precámbrico cálido y libre de hielo.
- Este amortiguador geoquímico mitigó grandes fluctuaciones en el CO2 atmosférico.
- El declive de la climatización inversa puede haber desestabilizado los climas posteriores de la Tierra.
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