Dissipation of Titans north polar cloud at northern spring equinox

Stéphane Le Mouélic, Pascal Rannou, Sébastien Rodriguez, Christophe Sotin, Caitlin A. Griffith, Lucille Le Corre, Jason W. Barnes, Robert H. Brown, Kevin H. Baines, Bonnie J. Buratti, Roger N. Clark, Philip D. Nicholson, Gabriel Tobie

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Saturns 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.

Original languageEnglish (US)
Pages (from-to)86-92
Number of pages7
JournalPlanetary and Space Science
Volume60
Issue number1
DOIs
StatePublished - Jan 1 2012

Keywords

  • Cassini
  • Cloud
  • Meteorology
  • Titan
  • VIMS

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Le Mouélic, S., Rannou, P., Rodriguez, S., Sotin, C., Griffith, C. A., Le Corre, L., Barnes, J. W., Brown, R. H., Baines, K. H., Buratti, B. J., Clark, R. N., Nicholson, P. D., & Tobie, G. (2012). Dissipation of Titans north polar cloud at northern spring equinox. Planetary and Space Science, 60(1), 86-92. https://doi.org/10.1016/j.pss.2011.04.006