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Forzamiento orbital de los depósitos en capas polares marcianos
Jacques Laskar1, Benjamin Levrard, John F Mustard
1Astronomie et Systèmes Dynamiques, IMC-CNRS UMR8028, 77 Av. Denfert-Rochereau, 75014 Paris, France. laskar@bdl.fr
Nature
|September 28, 2002
Resumen
Marte Marte es el planeta Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Geología Geología Geología.
Sus antecedentes:
- Las regiones polares de Marte exhiben terrenos en capas.
- Se supone que la formación de estas capas está relacionada con el forzamiento climático orbital marciano.
- Las estimaciones anteriores de las escalas de tiempo de deposición variaron significativamente.
Objetivo del estudio:
- Para determinar la tasa de deposición de los terrenos marcianos con capas polares.
- Para correlacionar la radiación de la capa de hielo con las variaciones de insolación.
- Para refinar la comprensión de la historia del clima de Marte.
Principales métodos:
- Análisis de imágenes de alta resolución y topografía de los terrenos marcianos con capas polares.
- Cálculos revisados de los parámetros orbitales y de rotación de Marte.
- Análisis fotométrico de datos para obtener la radiación de la capa de hielo en función de la profundidad.
- Comparación con las variaciones de insolación simuladas en el polo norte marciano.
Principales resultados:
- Se encontró una correlación entre la radiación de la capa de hielo y las variaciones de la insolación de verano en el polo norte marciano.
- Esta correlación es análoga a los estudios paleoclimáticos de la Tierra.
- Se obtuvo una tasa promedio de deposición de 0.05 cm yr ((-1) para los 250 m superiores de la capa de hielo polar norte.
Conclusiones:
- Los hallazgos apoyan el vínculo entre la formación de la capa polar marciana y el forzamiento climático orbital.
- El estudio proporciona una tasa de deposición más precisa para el hielo polar marciano.
- Esta investigación mejora nuestra comprensión de la evolución del clima de Marte.
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