The vertical profile of winds on Titan


One of Titan's most intriguing attributes is its copious but featureless atmosphere. The Voyager 1 fly-by and occultation in 1980 provided the first radial survey of Titan's atmospheric pressure and temperature1,2 and evidence for the presence of strong zonal winds3. It was realized that the motion of an atmospheric probe could be used to study the winds, which led to the inclusion of the Doppler Wind Experiment4 on the Huygens probe5. Here we report a high resolution vertical profile of Titan's winds, with an estimated accuracy of better than 1 m s-1. The zonal winds were prograde during most of the atmospheric descent, providing in situ confirmation of superrotation on Titan. A layer with surprisingly slow wind, where the velocity decreased to near zero, was detected at altitudes between 60 and 100 km. Generally weak winds (1 m s-1) were seen in the lowest 5 km of descent.

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Figure 1: Zonal wind velocity during the Huygens mission.
Figure 2: Titan zonal wind height profile.


  1. 1

    Tyler, G. L. et al. Radio science investigations of the Saturn system with Voyager 1: Preliminary results. Science 212, 201–206 (1981)

    ADS  CAS  Article  PubMed  Google Scholar 

  2. 2

    Lindal, G. F. et al. The atmosphere of Titan: An analysis of the Voyager 1 radio occultation measurements. Icarus 53, 348–363 (1983)

    ADS  CAS  Article  Google Scholar 

  3. 3

    Flasar, F. M., Samuelson, R. E. & Conrath, B. J. Titan's atmosphere: temperature and dynamics. Nature 292, 693–698 (1981)

    ADS  Article  Google Scholar 

  4. 4

    Bird, M. K. et al. The Huygens Doppler Wind Experiment. Space Sci. Rev. 104, 613–640 (2002)

    ADS  Article  Google Scholar 

  5. 5

    Lebreton, J.-P. et al. An overview of the descent and landing of the Huygens probe. Nature doi:10.1038/nature04347 (this issue)

  6. 6

    Del Genio, A. D., Zhou, W. & Eichler, T. P. Equatorial superrotation in a slowly rotating GCM: Implications for Titan and Venus. Icarus 101, 1–17 (1993)

    ADS  Article  Google Scholar 

  7. 7

    Hourdin, F. et al. Numerical simulation of the general circulation of the atmosphere of Titan. Icarus 117, 358–374 (1995)

    ADS  CAS  Article  PubMed  Google Scholar 

  8. 8

    Tokano, T., Neubauer, F. M., Laube, M. & McKay, C. P. Seasonal variation of Titan's atmospheric structure simulated by a general circulation model. Planet. Space Sci. 47, 493–520 (1999)

    ADS  CAS  Article  PubMed  Google Scholar 

  9. 9

    Luz, D., Hourdin, F., Rannou, P. & Lebonnois, S. Latitudinal transport by baroclinic waves in Titan's stratosphere. II. Results from a coupled dynamics-microphysics-photochemistry GCM. Icarus 166, 343–358 (2003)

    ADS  CAS  Article  Google Scholar 

  10. 10

    Hubbard, W. B. et al. The occultation of 28 Sgr by Titan. Astron. Astrophys. 269, 541–563 (1993)

    ADS  Google Scholar 

  11. 11

    Bouchez, A. H. Seasonal Trends in Titan's Atmosphere: Haze, Wind and Clouds PhD thesis, California Inst. Technol. (2003); available at

    Google Scholar 

  12. 12

    Kostiuk, T. et al. Direct measurement of winds on Titan. Geophys. Res. Lett. 28, 2361–2364 (2000)

    ADS  Article  Google Scholar 

  13. 13

    Porco, C. C. et al. Imaging of Titan from the Cassini spacecraft. Nature 434, 159–168 (2005)

    ADS  CAS  Article  Google Scholar 

  14. 14

    Fulchignoni, M. et al. In situ measurements of the physical characteristics of Titan's atmosphere. Nature doi:10.1038/nature04314 (this issue)

  15. 15

    Atkinson, D. H., Pollack, J. B. & Seiff, A. Measurement of a zonal wind profile on Titan by Doppler tracking of the Cassini entry probe. Radio Sci. 25, 865–882 (1990)

    ADS  Article  Google Scholar 

  16. 16

    Counselman, C. C. III, Gourevitch, S. A., King, R. W. & Loriot, G. B. Zonal and meridional circulation of the lower atmosphere of Venus determined by radio interferometry. J. Geophys. Res. 85, 8026–8030 (1980)

    ADS  Article  Google Scholar 

  17. 17

    Allison, M., Del Genio, A. D. & Zhou, W. Zero potential vorticity envelopes for the zonal-mean velocity of the Venus/Titan atmospheres. J. Atmos. Sci. 51, 694–702 (1994)

    ADS  Article  Google Scholar 

  18. 18

    Brown, M. E., Bouchez, A. H. & Griffith, C. A. Direct detection of variable tropospheric clouds near Titan's south pole. Nature 420, 795–797 (2002)

    ADS  CAS  Article  Google Scholar 

  19. 19

    Flasar, F. M. et al. Exploring the Saturn system in the thermal infrared: The Composite Infrared Spectrometer. Space Sci. Rev. 115, 169–297 (2004)

    ADS  CAS  Article  Google Scholar 

  20. 20

    Flasar, F. M. et al. Titan's atmospheric temperatures, winds, and composition. Science 308, 975–978 (2005)

    ADS  CAS  Article  PubMed  PubMed Central  Google Scholar 

  21. 21

    Kliore, A. J. et al. Cassini radio science. Space Sci. Rev. 115, 1–70 (2004)

    ADS  Article  Google Scholar 

  22. 22

    Tomasko, M. G. et al. Rain, winds and haze during the Huygens probe's descent to Titan's surface. Nature doi:10.1038/nature04126 (this issue)

  23. 23

    Flasar, F. M. & Conrath, B. J. in Proc. Symposium on Titan (ed. Kaldeich, B.) 89–99 (ESA-SP 338, ESA Publications, ESTEC, Noordwijk, The Netherlands, 1992)

    Google Scholar 

  24. 24

    Del Genio, A. D. & Zhou, W. Simulations of superrotation on slowly rotating planets: Sensitivity to rotation and initial condition. Icarus 120, 332–343 (1996)

    ADS  Article  Google Scholar 

  25. 25

    Allison, M. in Proc. Symposium on Titan (ed. Kaldeich, B.) 113–118 (ESA SP-338, ESA Publications, ESTEC, Noordwijk, The Netherlands, 1992)

    Google Scholar 

  26. 26

    Tokano, T. Meteorological assessment of the surface temperatures on Titan: Constraints on the surface type. Icarus 173, 222–242 (2005)

    ADS  CAS  Article  Google Scholar 

  27. 27

    Flasar, F. M., Allison, M. & Lunine, J. I. in Huygens Science Payload and Mission (ed. Wilson, A.) 287–298 (ESA-SP 1177, ESA Publications, ESTEC, Noordwijk, The Netherlands, 1997)

    Google Scholar 

  28. 28

    Dutta-Roy, R. & Bird, M. K. in Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science (ed. Wilson, A.) 109–116 (ESA SP-544, ESA Publications, ESTEC, Noordwijk, The Netherlands, 2004)

    Google Scholar 

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This Letter presents results of a research project partially funded by the Deutsches Zentrum für Luft- und Raumfahrt (DLR). Parts of the research described here were carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA, and by NASA's Goddard Institute for Space Studies. We thank R. Kohl, K.-P. Wagner and M. Heyl for their efforts during the DWE development programme. We appreciate the support provided by the National Radio Astronomy Observatory (NRAO) and the Australia Telescope National Facility (ATNF). NRAO is operated by Associated Universities, Inc., under a cooperative agreement with the NSF. The ATNF, managed by the Commonwealth Scientific and Industrial Research Organization (CSIRO), is funded by the Commonwealth of Australia.

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Correspondence to M. K. Bird.

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Supplementary Notes

This file contains the Supplementary Discussion, Supplementary Figures 1–3, Supplementary Tables 1–2. Supplementary Figure 1 details Huygens signal frequency measurements at the Green Bank and Parkes radio telescopes. Supplementary Figure 2 presents Huygens frequency measurements and predictions at the Green Bank Telescope. Supplementary Figure 3 details Huygens frequency measurements and predictions at the Parkes Telescope. Supplementary Table 1 lists radio telescopes participating in the Earth-based DWE network. Supplementary Table 2 presents the Radio link budget: Huygens-to-Green Bank Telescope. (PDF 70 kb)

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Bird, M., Allison, M., Asmar, S. et al. The vertical profile of winds on Titan. Nature 438, 800–802 (2005).

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