Evidence for a Polar Ethane Cloud on Titan

• Published in: Science
• Main Authors: Griffith, C.A., Penteado, P., Rannou, Pascal, Brown, R., Boudon, Vincent, Baines, K.H., Clark, R., Drossart, P., Buratti, B., Nicholson, P., Mckay, C.P., Coustenis, A., Negrao, A., Jaumann, R.
• Other Authors: Service d'aéronomie (SA), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2006
• Subjects: [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]; North Pole
• Online Access: https://hal.archives-ouvertes.fr/hal-00097283; https://doi.org/10.1126/science.1128245

Spectra from Cassini's Visual and Infrared Mapping Spectrometer reveal the presence of a vast tropospheric cloud on Titan at latitudes 51° to 68° north and all longitudes observed (10° to 190° west). The derived characteristics indicate that this cloud is composed of ethane and forms as a result of stratospheric subsidence and the particularly cool conditions near the moon's north pole. Preferential condensation of ethane, perhaps as ice, at Titan's poles during the winters may partially explain the lack of liquid ethane oceans on Titan's surface at middle and lower latitudes.