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Deep winds beneath Saturn’s upper clouds from a seasonal long-lived planetary-scale storm


Convective storms occur regularly in Saturn’s atmosphere1,2,3,4. Huge storms known as Great White Spots, which are ten times larger than the regular storms, are rarer and occur about once per Saturnian year (29.5 Earth years). Current models propose that the outbreak of a Great White Spot is due to moist convection induced by water5,6. However, the generation of the global disturbance and its effect on Saturn’s permanent winds1,7 have hitherto been unconstrained8 by data, because there was insufficient spatial resolution and temporal sampling9,10,11 to infer the dynamics of Saturn’s weather layer (the layer in the troposphere where the cloud forms). Theoretically, it has been suggested that this phenomenon is seasonally controlled5,9,10. Here we report observations of a storm at northern latitudes in the peak of a weak westward jet during the beginning of northern springtime, in accord with the seasonal cycle but earlier than expected. The storm head moved faster than the jet, was active during the two-month observation period, and triggered a planetary-scale disturbance that circled Saturn but did not significantly alter the ambient zonal winds. Numerical simulations of the phenomenon show that, as on Jupiter12, Saturn’s winds extend without decay deep down into the weather layer, at least to the water-cloud base at pressures of 10–12 bar, which is much deeper than solar radiation penetrates.

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Figure 1: Initial growth of the Great White Spot.
Figure 2: Expansion of the storm clouds and the planetary-scale disturbance.
Figure 3: Zonal winds from motions of the disturbance clouds.
Figure 4: Models of the GWS planetary-scale disturbance.


  1. Del Genio, A. D. et al. in Saturn from Cassini-Huygens (eds Dougherty, M., Esposito, L. & Krimigis, T. ) 113–159 (Springer, 2009)

  2. Porco, C. C. et al. Cassini imaging science: initial results on Saturn’s atmosphere. Science 307, 1243–1247 (2005)

    Article  ADS  CAS  Google Scholar 

  3. Dyudina, U. A. et al. Lightning storms on Saturn observed by Cassini ISS and RPWS during 2004–2006. Icarus 190, 545–555 (2007)

    Article  ADS  Google Scholar 

  4. Fischer, G. et al. Analysis of a giant lightning storm on Saturn. Icarus 190, 528–544 (2007)

    Article  ADS  Google Scholar 

  5. Sánchez-Lavega, A. & Battaner, E. The nature of Saturn’s atmospheric Great White Spots. Astron. Astrophys. 185, 315–326 (1987)

    ADS  Google Scholar 

  6. Hueso, R. & Sánchez-Lavega, A. A. Three-dimensional model of moist convection for the giant planets II: Saturn's water and ammonia moist convective storms. Icarus 172, 255–271 (2004)

    Article  ADS  CAS  Google Scholar 

  7. Sánchez-Lavega, A., Rojas, J. F. & Sada, P. V. Saturn’s zonal winds at cloud level. Icarus 147, 405–420 (2000)

    Article  ADS  Google Scholar 

  8. Sayanagi, K. M. & Showman, A. P. Effects of a large convective storm on Saturn’s equatorial jet. Icarus 187, 520–539 (2007)

    Article  ADS  Google Scholar 

  9. Sánchez-Lavega, A. et al. The Great White Spot and disturbances in Saturn’s equatorial atmosphere during 1990. Nature 353, 397–401 (1991)

    Article  ADS  Google Scholar 

  10. Sánchez-Lavega, A., Lecacheux, J., Colas, F. & Laques, P. Temporal behavior of cloud morphologies and motions in Saturn’s atmosphere. J. Geophys. Res. 98 (E10). 18857–18872 (1993)

    Article  ADS  Google Scholar 

  11. Barnet, C. D., Westphal, J. A., Beebe, R. F. & Huber, L. F. Hubble Space Telescope observations of the 1990 equatorial disturbance on Saturn: zonal winds and central meridian albedos. Icarus 100, 499–511 (1992)

    Article  ADS  Google Scholar 

  12. Sánchez-Lavega, A. et al. Depth of a strong jovian jet from a planetary-scale disturbance driven by storms. Nature 451, 437–440 (2008)

    Article  ADS  Google Scholar 

  13. Fischer, G. et al. A giant thunderstorm on Saturn. Nature 10.1038/nature10205 (this issue).

  14. Sánchez-Lavega, A. Motions in Saturn’s atmosphere: observations before Voyager encounters. Icarus 49, 1–16 (1982)

    Article  ADS  Google Scholar 

  15. Beebe, R. F., Barnet, C., Sada, P. V. & Murrell, A. S. The onset and growth of the 1990 equatorial disturbance on Saturn. Icarus 95, 163–172 (1992)

    Article  ADS  Google Scholar 

  16. Seidelmann, P. K. et al. Report of the IAU/IAG working group on cartographic coordinates and rotational elements: 2006. Celestial Mech. Dyn. Astron. 98, 155–180 (2007)

    Article  ADS  Google Scholar 

  17. Sánchez Lavega, A. et al. Large-scale storms in Saturn’s atmosphere during 1994. Science 271, 631–634 (1996)

    Article  ADS  Google Scholar 

  18. Acarreta, J. R. & Sánchez-Lavega, A. Vertical cloud structure in Saturn’s 1990 equatorial storm. Icarus 137, 24–33 (1999)

    Article  ADS  Google Scholar 

  19. Pérez-Hoyos, S., Sánchez-Lavega, A., French, R. G. & Rojas, J. F. Saturn’s cloud structure and temporal evolution from ten years of Hubble Space Telescope Images (1994–2003). Icarus 176, 155–174 (2005)

    Article  ADS  Google Scholar 

  20. West, R. A., Baines, K. H., Karkoschka, E. & Sánchez-Lavega, A. in Saturn from Cassini-Huygens (eds Dougherty, M., Esposito, L. & Krimigis, T. ) 161–179 (Springer, 2009)

    Book  Google Scholar 

  21. Fletcher, L. N. et al. Seasonal change on Saturn from Cassini CIRS observations, 2004–2009. Icarus 208, 337–352 (2010)

    Article  ADS  CAS  Google Scholar 

  22. Dowling, T. E. et al. The explicit planetary isentropic-coordinate (EPIC) atmospheric model. Icarus 132, 221–238 (1998)

    Article  ADS  CAS  Google Scholar 

  23. Read, P. L. et al. Mapping potential vorticity dynamics on Saturn: zonal mean circulation from Cassini and Voyager data. Planet. Space Sci. 57, 1682–1698 (2009)

    Article  ADS  Google Scholar 

  24. Pérez-Hoyos, S. & Sánchez-Lavega, A. Solar flux in Saturn's atmosphere: maximum penetration and heating rates in the aerosol and cloud layers. Icarus 180, 368–378 (2006)

    Article  ADS  Google Scholar 

  25. Li, L. et al. Saturn’s emitted power. J. Geophys. Res. 115 E11002 10.1029/2010JE003631 (2010)

    Article  ADS  Google Scholar 

  26. Barnet, C. D., Beebe, R. F. & Conrath, B. J. A seasonal radiative-dynamic model of Saturn’s troposphere. Icarus 98, 94–107 (1992)

    Article  ADS  Google Scholar 

  27. García-Melendo, E., Sánchez-Lavega, A. & Hueso, R. Numerical models of Saturn’s long-lived anticyclones. Icarus 191, 665–677 (2007)

    Article  ADS  Google Scholar 

  28. del Río-Gaztelurrutia, T., Legarreta, J., Hueso, R., Pérez-Hoyos, S. & Sánchez-Lavega, A. A long-lived cyclone in Saturn’s atmosphere: observations and models. Icarus 209, 665–681 (2010)

    Article  ADS  Google Scholar 

  29. Choi, D. S., Showman, A. P. & Brown, R. H. Cloud features and zonal wind measurements of Saturn's atmosphere as observed by Cassini/VIMS. J. Geophys. Res. 114 E04007 10.1029/2008JE003254 (2009)

    Article  ADS  CAS  Google Scholar 

  30. Hueso, R. et al. The International Outer Planets Watch atmospheres node database of giant planets images. Planet. Space Sci. 58, 1152–1159 (2010)

    Article  ADS  Google Scholar 

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A.S.-L., T.d.R.-G., R.H., J.L., J.M.G.-F., E.G.-M. and J.F.S.-R. are supported by the Spanish MICIIN, by FEDER and by Gobierno Vasco. We thank S. Pérez-Hoyos for initial support of this study and M. Alises and A. Guijarro for taking the Calar Alto Observatory images (CAHA and MPG/CSIC). E.G.-M. used computing facilities at CESCA (Barcelona) supported by MICIIN. L.N.F. is supported by a Glasstone fellowship at the University of Oxford. The International Outer Planet Watch (IOPW) Team and other individual contributors listed in Supplementary Information provided most of the images used for tracking in this study; these images were complemented in some cases with images taken from contributors to the ALPO Japan (Association of Lunar and Planetary Observers) database (

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Authors and Affiliations




A.S.-L. coordinated the study and performed the motion and wind measurements and the interpretation. T.d.R.-G. performed the photometric measurements and filter calibrations. R.H. measured the storm growth rate and with J. Legarreta coordinated the IOPW database. J.M.G.-F. prepared the map projections and image search. J.F.S.-R. performed the radiative transfer calculations. E.G.-M. and J. Legarreta performed the EPIC simulations. F.C. and J. Lecacheux provided the Pic-du-Midi photometric images. L.N.F. provided data on the thermal structure of the storm. D.B.-N. provided the photometric images obtained at Calar Alto Observatory, and D.P. provided photometric images at selected wavelengths. All these authors discussed the results and commented on the manuscript. Contributors to the IOPW-PVOL database are listed at the end of this Letter.

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Correspondence to A. Sánchez-Lavega.

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Sánchez-Lavega, A., Río-Gaztelurrutia, T., Hueso, R. et al. Deep winds beneath Saturn’s upper clouds from a seasonal long-lived planetary-scale storm. Nature 475, 71–74 (2011).

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