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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Published on: June 8, 2015

La atmósfera temprana de la Tierra La atmósfera temprana de la Tierra.

¹Department of Geosciences, The Pennsylvania State University, University Park 16802.

Science (New York, N.Y.)

|February 12, 1993

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Tierra temprana de la Tierra temprana.

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La disciplina de la NASA es la exobiología.La Disciplina de la NASA número 52-30 fue aprobada por la NASA.Programa de exobiología de la NASA Programa de exobiología de la NASA.No perteneciente al Centro de la NASA.

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Área de la Ciencia:

Las geociencias son ciencias geológicas.
Paleoclimatología Paleoclimatología
Astrobiología Astrobiología.

Sus antecedentes:

La composición atmosférica y la evolución del clima en la Tierra primitiva no se comprenden completamente.
Existen incertidumbres clave con respecto al momento y los impulsores de la oxigenación atmosférica.
La magnitud del efecto invernadero temprano necesario para contrarrestar la menor luminosidad solar sigue siendo especulativa.

Objetivo del estudio:

Para investigar la evolución de la atmósfera temprana de la Tierra y el clima.
Para abordar las incertidumbres en el tiempo y las causas de la oxigenación atmosférica.
Para refinar las estimaciones de las primeras concentraciones atmosféricas de gases de efecto invernadero.

Principales métodos:

Este estudio sintetiza la investigación existente y los modelos teóricos sobre la evolución temprana de la atmósfera terrestre.
Analiza la evidencia geológica para eventos de oxigenación y niveles de gases de efecto invernadero.
Se pueden considerar enfoques comparativos de planetología.

Principales resultados:

Si bien se aceptan las tendencias generales de aumento de oxígeno y un efecto invernadero temprano más fuerte, los detalles precisos siguen siendo escurridizos.
El aumento del oxígeno hace unos 2.000 millones de años es un evento significativo, pero sus desencadenantes son debatidos.
Los niveles requeridos de dióxido de carbono y otros gases de efecto invernadero para la regulación temprana del clima aún están bajo investigación.

Conclusiones:

Resolver las incertidumbres en la composición temprana de la atmósfera es crucial para comprender la evolución de la vida en la Tierra.
Las reconstrucciones precisas de atmósferas pasadas ayudan en la búsqueda de vida extraterrestre en exoplanetas.
Se necesita más investigación para dilucidar completamente los complejos procesos que gobiernan las primeras atmósferas planetarias.