Semi-annual oscillations in Saturn's low-latitude stratospheric temperatures
Abstract
Observations of oscillations of temperature and wind in planetary atmospheres provide a means of generalizing models for atmospheric dynamics in a diverse set of planets in the Solar System and elsewhere. An equatorial oscillation similar to one in the Earth's atmosphere has been discovered in Jupiter. Here we report the existence of similar oscillations in Saturn's atmosphere, from an analysis of over two decades of spatially resolved observations of its 7.8-microm methane and 12.2-microm ethane stratospheric emissions, where we compare zonal-mean stratospheric brightness temperatures at planetographic latitudes of 3.6 degrees and 15.5 degrees in both the northern and the southern hemispheres. These results support the interpretation of vertical and meridional variability of temperatures in Saturn's stratosphere as a manifestation of a wave phenomenon similar to that on the Earth and in Jupiter. The period of this oscillation is 14.8 +/- 1.2 terrestrial years, roughly half of Saturn's year, suggesting the influence of seasonal forcing, as is the case with the Earth's semi-annual oscillation.
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The Equatorial Zone has quasi-periodic thermal oscillations in the stratosphere that occur both in altitude and in time.
“as well as quasi-periodic thermal oscillations in the stratosphere that occur both in altitude and in time (Fouchet et al., 2008; Orton et al., 2008; Guerlet et al., 2018).”
From Saturn atmospheric dynamics one year after Cassini: Long-lived features and time variations in the drift of the Hexagon (2020) · cites this paper as Orton et al., 2008
The narrow and intense jet in the upper hazes and its temporal variations could be related to the equatorial thermal oscillations.
“the narrow and intense jet in the upper hazes and its temporal variations could be related to the equatorial thermal oscillations (Fouchet et al., 2008; Orton et al., 2008; Guerlet et al., 2018).”
From Saturn atmospheric dynamics one year after Cassini: Long-lived features and time variations in the drift of the Hexagon (2020) · cites this paper as Orton et al., 2008
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Saturn's Seasonal Atmosphere at Northern Summer SolsticePreprint
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Synchronization in Climate Dynamics and Other Extended Systems
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Spatiotemporal Variability of Saturn's Zonal Winds Observed by Cassini
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Zonons Are Solitons Produced by Rossby Wave Ringing
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Ground-Based Observational Support for Spacecraft Exploration of the Outer Planets
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Equatorial stratospheric oscillations in planetary atmospheres
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The Strongest Jet Ever Detected and a New Thermal Wave in Saturn's Equatorial Stratosphere
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- Authors
- Orton, G. S., Yanamandra-Fisher, P. A., Fisher, B. M., Friedson, A. J., Parrish, P. D., Nelson, J. F., Bauermeister, A. S., Fletcher, L., Gezari, D. Y., Varosi, F., Tokunaga, A. T., Caldwell, J., Baines, K. H., Hora, J. L., Ressler, M. E., Fujiyoshi, T., Fuse, T., Hagopian, H., Martin, T. Z., Bergstralh, J. T., Howett, C., Hoffmann, W. F., Deutsch, L. K., Van Cleve, J. E., Noe, E., Adams, J. D., Kassis, M., & Tollestrup, E.
- Affiliations
- California Institute of Technology (US)
- University of Edinburgh (GB)
- University of Maine (US)
- University of California, Berkeley (US)
- Goddard Space Flight Center (US)
- University of Hawaiʻi at Mānoa (US)
- York University (CA)
- Harvard University (US)
- National Astronomical Observatory of Japan (JP)
- University of California, Los Angeles (US)
- Langley Research Center (US)
- University of Oxford (GB)
- University of Arizona (US)
- Cornell University (US)
- W.M. Keck Observatory (US)
- Corresponding author
- Orton, Glenn S.
- ORCID
- Venue
- Nature
- Published
- 2008-05
- Volume
- 453
- Issue
- 7192
- Pages
- 196-199
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2075594667
- Cited by
- 94
- References
- 15
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 4 · 2023: 4 · 2022: 5 · 2021: 2 · 2020: 7 · 2019: 5 · 2018: 7 · 2017: 3 · 2016: 2 · 2015: 9 · 2014: 4 · 2013: 4 · 2012: 3
- FWCI
- 5.44
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- National Aeronautics and Space Administration
- California Institute of Technology
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Ionosphere and magnetosphere dynamics
- Keywords
- Saturn, semiannual oscillation, stratospheric temperature, seasonal forcing, methane emissions, planetary atmospheres, atmospheric waves, Cassini
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