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Mapping potential vorticity dynamics on saturn: Zonal mean circulation from Cassini and Voyager data

Read, P.L., Conrath, B.J., Fletcher, L.N., Gierasch, P.J., Simon-Miller, A.A., Zuchowski, L.C.·2009·Planetary and Space Science
DOI 10.1016/j.pss.2009.03.004
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Crossref · 10.1016/j.pss.2009.03.004

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  • The model resolution of approximately 350×350 km at the jet location is adequate to resolve the estimated deformation radius at this latitude (~1100 km).

    “with a resolution of 350 350 » ´ km at the jet location, which is adequate to resolve the estimated deformation radius at this latitude ( L 1100 d » km; Read et al. 2009 ) .”

    From MEANDERING SHALLOW ATMOSPHERIC JET AS A MODEL OF SATURNʼS NORTH-POLAR HEXAGON (2015) · cites this paper as Read et al. 2009

  • At the latitude of the Hexagon, the beta parameter is very small compared to the second derivative of the mean zonal wind, and the Rayleigh-Kuo criterion for barotropic stability is easily violated.

    “At the latitude of the Hexagon, the beta parameter ( df dy b = , where f 2 sin( ) l = W is the Coriolis parameter ) is very small compared to the second derivative of the mean zonal wind, and the necessary, but insuf fi cient, Rayleigh-Kuo criterion for barotropic stability is easily violated ( Ingersoll et al. 1984; Read et al. 2009 ) .”

    From MEANDERING SHALLOW ATMOSPHERIC JET AS A MODEL OF SATURNʼS NORTH-POLAR HEXAGON (2015) · cites this paper as Read et al. 2009

  • The meandering of the jetstream that forms the hexagon is believed to be a Rossby wave resulting from an instability of the eastward zonal jet near 78°N and trapped within a waveguide formed by the zonal jets.

    “The meandering of the jetstream that forms the hexagon is believed to be a Rossby wave31 resulting from an instability of the eastward zonal jet near 78°N29,32–34 and trapped within a waveguide formed by the zonal jets.”

    From A hexagon in Saturn's northern stratosphere surrounding the emerging summertime polar vortex (2018) · cites this paper as [32]

  • Waves and large-scale eddies are often found in locations where instability is possible.

    “Although the possibility of instability is not sufficient to explain the hexagon’s origins, waves and large-scale eddies are often found in such locations32.”

    From A hexagon in Saturn's northern stratosphere surrounding the emerging summertime polar vortex (2018) · cites this paper as [32]

  • The βe sign reversal suggests that the atmosphere violates both the neutral-stability criterion relative to Arnol'd's second theorem and the Charney-Stern and Rayleigh-Kuo necessary conditions for baroclinic and barotropic stability, respectively.

    “The βe sign reversal suggests that the atmosphere violates both the neutral-stability criterion relative to Arnol’d’s second theorem32 and the Charney–Stern50 and Rayleigh–Kuo necessary conditions for baroclinic and barotropic stability, respectively.”

    From A hexagon in Saturn's northern stratosphere surrounding the emerging summertime polar vortex (2018) · cites this paper as [32]

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Authors
Read, P. L., Conrath, B. J., Fletcher, L. N., Gierasch, P. J., Simon-Miller, A. A., & Zuchowski, L. C.
Affiliations
  • University of Oxford (GB)
  • Cornell University (US)
  • Jet Propulsion Laboratory (US)
Corresponding author
Read, P.L.
ORCID
Venue
Planetary and Space Science
Publisher
Elsevier BV
Published
2009-12
Volume
57
Issue
14-15
Pages
1682-1698
ISSN
0032-0633 (ISSN-L)
DOI
10.1016/j.pss.2009.03.004
OpenAlex
W2024254895
Cited by
82
References
63
Citations by year
2026: 4 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 8 · 2019: 6 · 2018: 8 · 2017: 5 · 2016: 6 · 2015: 6 · 2014: 3 · 2013: 6 · 2012: 3
FWCI
3.02
Type
journal article
Language
en
Open access
closed
Licence
Locations
Planetary and Space Science (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Ionosphere and magnetosphere dynamics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
Keywords
Saturn, potential vorticity, zonal mean circulation, Ertel potential vorticity, quasi-geostrophic potential vorticity, upper troposphere, lower stratosphere, zonal jets, baroclinic instability, large-scale eddies, Voyager spacecraft, Cassini

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