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Detección directa de nubes troposféricas variables cerca del polo sur de Titán

Michael E Brown¹, Antonin H Bouchez, Caitlin A Griffith

¹Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA. mbrown@caltech.edu

|December 20, 2002

Resumen

Se han descubierto nubes transitorias de metano cerca del polo sur de Titán, lo que confirma un ciclo de metano similar al de la Tierra. Se espera que estas nubes estacionales se desplacen al polo norte en 15 años.

Área de la Ciencia:

Ciencias planetarias Ciencias planetarias.
Ciencias de la atmósfera Ciencias atmosféricas.
Astrobiología Astrobiología.

Sus antecedentes:

Titán, la luna más grande de Saturno, puede tener un ciclo hidrológico basado en metano análogo al de la Tierra.
Estudios anteriores carecían de evidencia directa de nubes de condensación troposférica en Titán, a pesar de los hallazgos espectroscópicos indirectos.

Objetivo del estudio:

Para proporcionar evidencia observacional directa de las nubes de condensación de metano en la atmósfera de Titán.
Para investigar la formación, ubicación y comportamiento estacional de estas nubes.

Principales métodos:

Análisis de imágenes detalladas y datos espectrales de Titán.
Observación de las formaciones de nubes concentradas cerca del polo sur.

Principales resultados:

Claras nubes de metano transitorias fueron observadas directamente y fotografiadas cerca del polo sur de Titán.
La presencia y la ubicación de estas nubes indican convección húmeda localizada.
La formación de nubes parece estar controlada estacionalmente por las variaciones de temperatura de la superficie.

Conclusiones:

El descubrimiento confirma un ciclo de condensación y precipitación de metano en Titán.
Las nubes de metano atmosférico de Titán exhiben migración estacional, moviéndose del polo sur al polo norte durante aproximadamente 15 años.

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