Abstract
Saturn’s Great White Spots are rare planetary-scale storms that have been observed only six times since 18761,2. The most recent Great White Spot appeared in December 2010 and has been studied from both ground-based3,4 and spacecraft observations5,6,7. The storm developed into an enormous disturbance extending over 10,000 km at cloud level3,4,7, emitted intense electrostatic discharges5 over several months, and caused long-standing localized warming in the high stratosphere6,8 of about 60 K. Here we analyse the dynamics of the storm’s head using high-resolution imagery obtained by the Cassini spacecraft on 26 February 2011. We find strong winds with speeds up to 160 m s−1 and organized into a divergent open anticyclone where massive cumulus-like cloud clusters interact with the ambient zonal flow to generate a storm front. The cloud clusters evolved over a timescale of hours, with cloud tops reaching 44 km above the undisturbed environment. Simulations using a general circulation model, which includes Saturn’s zonal winds, reproduce the observations when a persistent heat source is introduced, causing a high-pressure anomaly. We conclude that the complex phenomenology of a mature Great White Spot represents a natural response of the saturnian atmosphere to severe sustained convection in a sheared background flow.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 12 print issues and online access
$259.00 per year
only $21.58 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Sánchez Lavega, A. Motions in Saturn’s atmosphere: Observations before Voyager encounters. Icarus 49, 1–16 (1982).
Sánchez-Lavega, A. Saturn’s great white spots. CHAOS 4, 341–353 (1994).
Sánchez-Lavega, A. et al. Deep winds beneath Saturn’s upper clouds from a seasonal long-lived planetary-scale storm. Nature 475, 71–74 (2011).
Sánchez-Lavega, A. et al. Ground-based observations of the long-term evolution and death of Saturn’s 2010 great white spot. Icarus 220, 561–576 (2012).
Fischer, G. et al. A giant thunderstorm on Saturn. Nature 475, 75–77 (2011).
Fletcher, L. N. et al. Thermal structure and dynamics of Saturn’s northern springtime disturbance. Science 332, 1413–1417 (2011).
Sayanagi, K. M. et al. Dynamics of Saturn’s great storm of 2010–2011 from Cassini ISS and RPWS. Icarus 223, 460–478 (2012).
Fletcher, L. N. et al. The origin and evolution of Saturn’s 2011–2012 stratospheric vortex. Icarus 221, 560–586 (2012).
Porco, C. C. et al. Cassini Imaging Science: Instrument characteristics and anticipated scientific investigations at Saturn. Space Sci. Rev. 115, 363–497 (2004).
Sánchez-Lavega, A. An Introduction to Planetary Atmospheres (Taylor and Francis, CRC Press, 2011).
Hunt, G. E., Godfrey, D. A., Muller, J-P. & Barrey, R. F. T. Dynamical features in the northern hemisphere of Saturn from Voyager 1 images. Nature 297, 132–134 (1982).
Sánchez-Lavega, A. & Battaner, E. The Nature of Saturn’s atmospheric great white spots. Astronom. Astrophys. 185, 315–326 (1987).
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).
Del Genio, A. D. et al. Saturn Eddy momentum fluxes and convection: First estimates from Cassini images. Icarus 189, 479–492 (2007).
Del Genio, A. D. & Barbara, J. M. Constraints on Saturn’s tropospheric general circulation from Cassini ISS images. Icarus 219, 689–700 (2012).
Holton, J.R. An Introduction to Dynamic Meteorology 3rd edn (Academic, 1992).
Mitchell, J. L. The Nature of Large-Scale Turbulence in the Jovian Atmosphere 82–34 (JPL Publication, NASA-JPL, 1982).
Asay-Davis, X. S. et al. Jupiter’s shrinking Great Red Spot and steady Oval BA: Velocity measurements with the ‘Advection Corrected Correlation Image Velocimetry’ automated cloud-tracking method. Icarus 203, 164–188 (2009).
Pérez-Hoyos, S. et al. Saturn’s cloud structure and temporal evolution from ten years of Hubble Space Telescope images (1994–2003). Icarus 176, 155–174 (2005).
Sanz-Requena, J. F. et al. Cloud structure of Saturn’s Storm from ground-based visual imaging. Icarus 219, 142–149 (2012).
Acarreta, J. R. & Sánchez Lavega, A. Vertical cloud structure in Saturn’s 1990 Equatorial Storm. Icarus 137, 24–33 (1999).
Dowling, T. et al. The explicit planetary isentropic-coordinate (EPIC) atmospheric model. Icarus 132, 221–238 (1998).
Garcı´a-Melendo, E., Pérez-Hoyos, S. & Sánchez-Lavega, A. Hueso, R. Saturn’s zonal wind profile in 2004–2009 from Cassini ISS images and its long-term variability. Icarus 215, 62–74 (2011).
Hueso, R. et al. The planetary laboratory for image analysis (PLIA). Adv. Space Res. 46, 1120–1138 (2010).
Hueso, R., Legarreta, J., Garcı´a-Melendo, E., Sánchez-Lavega, A. & Pérez-Hoyos, S. The Jovian anticyclone BA: II. Circulation and interaction with the zonal jets. Icarus 203, 499–515 (2009).
Acknowledgements
We gratefully acknowledge the work of the Cassini ISS team that allowed these data to be obtained. We are grateful to J. Guerrero for installing EPIC at the ICE computer facilities. This research also made use of the computing facilities at CESCA in Barcelona with the help of the Spanish MICINN-MEC. This work was supported by the Spanish MICINN project AYA2009-10701 and AYA2012-36666 with FEDER support, Grupos Gobierno Vasco IT-464-07 and UPV/EHU UFI11/55.
Author information
Authors and Affiliations
Contributions
E.G-M. designed the numerical experiments and ran EPIC simulations; R.H. measured the cloud motions, divergences and vorticity on images separated by 20–30 min; A.S-L. coordinated the study and performed the cloud tracking on images separated by 10.5 h; J.L. ran EPIC simulations; T.d.R-G. performed the wind measurements on images separated by 1 h; S.P-H. and J.F.S-R. performed the radiative transfer calculations. All authors discussed the results and commented on the manuscript.
Corresponding author
Ethics declarations
Competing interests
The authors declare no competing financial interests.
Supplementary information
Supplementary Information
Supplementary Information (PDF 1257 kb)
Rights and permissions
About this article
Cite this article
García-Melendo, E., Hueso, R., Sánchez-Lavega, A. et al. Atmospheric dynamics of Saturn’s 2010 giant storm. Nature Geosci 6, 525–529 (2013). https://doi.org/10.1038/ngeo1860
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/ngeo1860
This article is cited by
-
Cassini Exploration of the Planet Saturn: A Comprehensive Review
Space Science Reviews (2020)
-
A complex storm system in Saturn’s north polar atmosphere in 2018
Nature Astronomy (2019)