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Direct detection of variable tropospheric clouds near Titan's south pole

Author

Listed:
  • Michael E. Brown

    (California Institute of Technology)

  • Antonin H. Bouchez

    (California Institute of Technology)

  • Caitlin A. Griffith

    (University of Arizona)

Abstract

Atmospheric conditions on Saturn's largest satellite, Titan, allow the possibility that it could possess a methane condensation and precipitation cycle with many similarities to Earth's hydrological cycle. Detailed imaging studies1,2,3,4 of Titan have hitherto shown no direct evidence for tropospheric condensation clouds, although there has been indirect spectroscopic evidence for transient clouds5,6. Here we report images and spectra of Titan that show clearly transient clouds, concentrated near the south pole, which is currently near the point of maximum solar heating. The discovery of these clouds demonstrates the existence of condensation and localized moist convection in Titan's atmosphere. Their location suggests that methane cloud formation is controlled seasonally by small variations in surface temperature, and that the clouds will move from the south to the north pole on a 15-year timescale.

Suggested Citation

  • Michael E. Brown & Antonin H. Bouchez & Caitlin A. Griffith, 2002. "Direct detection of variable tropospheric clouds near Titan's south pole," Nature, Nature, vol. 420(6917), pages 795-797, December.
    • Handle: RePEc:nat:nature:v:420:y:2002:i:6917:d:10.1038_nature01302
    DOI: 10.1038/nature01302
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