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Dissipation of Titans north polar cloud at northern spring equinox

January 1, 2012

Saturn's Moon Titan has a thick atmosphere with a meteorological cycle. We report on the evolution of the giant cloud system covering its north pole using observations acquired by the Visual and Infrared Mapping Spectrometer onboard the Cassini spacecraft. A radiative transfer model in spherical geometry shows that the clouds are found at an altitude between 30 and 65 km. We also show that the polar cloud system vanished progressively as Titan approached equinox in August 2009, revealing at optical wavelengths the underlying sea known as Kraken Mare. This decrease of activity suggests that the north-polar downwelling has begun to shut off. Such a scenario is compared with the Titan global circulation model of Rannou et al. (2006), which predicts a decrease of cloud coverage in northern latitudes at the same period of time.

Citation Information

Publication Year 2012
Title Dissipation of Titans north polar cloud at northern spring equinox
DOI 10.1016/j.pss.2011.04.006
Authors S. Le Mouelic, P. Rannou, S. Rodriguez, Christophe Sotin, C.A. Griffith, L. Le Corre, J. W. Barnes, R. H. Brown, K. H. Baines, B. J. Buratti, Roger N. Clark, P. D. Nicholson, G. Tobie
Publication Type Article
Publication Subtype Journal Article
Series Title Planetary and Space Science
Series Number
Index ID 70032511
Record Source USGS Publications Warehouse
USGS Organization