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Jets de CO2 formados por sublimación debajo de la placa de hielo translúcida en la capa de hielo polar sur estacional
Hugh H Kieffer1, Philip R Christensen, Timothy N Titus
1Celestial Reasonings, Carson City, Nevada 89703, USA.
Nature
|August 18, 2006
Resumen
Las manchas oscuras y los canales en los casquetes polares de Marte se forman por el gas CO2 que entra en erupción a través de la capa de hielo estacional de dióxido de carbono, levantando materiales granulares oscuros a la superficie. Estos procesos geológicos marcianos únicos difieren de cualquiera observado en la Tierra.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- La detección remota con sensores.
Sus antecedentes:
- Los casquetes polares marcianos exhiben cambios estacionales dinámicos con la formación y sublimación de hielo de dióxido de carbono (CO2).
- Inusuales manchas oscuras, ventiladores y canales aparecen durante el retroceso de la capa de hielo de CO2 del polo sur.
- El origen de estos rasgos superficiales y canales asociados ha sido incierto.
Objetivo del estudio:
- Para investigar la naturaleza de las manchas oscuras y los ventiladores observados durante la retirada de la capa de hielo de CO2.
- Determinar los procesos responsables de la formación de las redes de canales radiales.
Principales métodos:
- Observaciones de luz infrarroja y visible de la región polar sur de Marte.
- Análisis de las temperaturas superficiales y propiedades del material.
Principales resultados:
- Las manchas oscuras y los ventiladores mantienen las temperaturas de hielo de CO2, lo que indica que son materiales granulares en la superficie del hielo.
- La sublimación desde la base de la capa de hielo de CO2 crea gas a alta presión.
- La presión del gas rompe el hielo, formando respiraderos de CO2 que expulsan material granular y canales de erosión.
Conclusiones:
- Las características de la superficie marciana observadas se forman por la presión de gas subterráneo dentro de la capa de hielo estacional de CO2.
- Estas características son el resultado de la ventilación del gas CO2, que transporta material granular y crea canales.
- El mecanismo propuesto para la formación de manchas y canales es único en Marte.
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