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Saturn's Atmosphere at 1–10 Kilometer Resolution

Ingersoll, Andrew P. and Ewald, Shawn P. and Sayanagi, Kunio M. and Blalock, John J. (2018) Saturn's Atmosphere at 1–10 Kilometer Resolution. Geophysical Research Letters, 45 (15). pp. 7851-7856. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20180919-142046769

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Abstract

We present images of Saturn from the final phases of the Cassini mission, including images with 0.5 km per pixel resolution, as high as any Saturn images ever taken. Notable features are puffy clouds resembling terrestrial cumulus, shadows indicating cloud height, dome and bowl shaped cloud structures indicating upwelling and downwelling in anticyclones and cyclones respectively, and filaments, which are thread‐like clouds that remain coherent over distances of 20,000 km. From the coherence of the filaments, we give upper bounds on the diffusivity and kinetic energy dissipation. A radiative transfer analysis by Sanz‐Requena et al. (2018) indicates that methane‐band imagery is most useful in determining cloud and haze properties in the 60–250 mbar pressure range. Our methane‐band imagery finds haze in this pressure range covering 64°‐74°planetocentric latitude. Filaments lie within the haze, and cumulus clouds lie below it, but pressure levels are uncertain below the 250 mbar level.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2018GL079255DOIArticle
ORCID:
AuthorORCID
Ingersoll, Andrew P.0000-0002-2035-9198
Ewald, Shawn P.0000-0002-1567-9154
Sayanagi, Kunio M.0000-0001-8729-0992
Blalock, John J.0000-0002-7460-1074
Additional Information:© 2018 American Geophysical Union. Received 30 MAR 2018; Accepted 13 JUL 2018; Accepted article online 24 JUL 2018; Published online 11 AUG 2018. This work was partly conducted at the Jet Propulsion Laboratory (JPL) under contract with the National Aeronautics and Space Administration (NASA). API and SPE were partly supported by the National Science Foundation (NSF Grant 1411952). The data are in the NASA Planetary Data System. Image numbers are provided in the supporting information.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
JPL/NASAUNSPECIFIED
NSFAST-1411952
Subject Keywords:Saturn; Cassini; clouds; dust; atmosphere; dissipation
Issue or Number:15
Record Number:CaltechAUTHORS:20180919-142046769
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180919-142046769
Official Citation:Ingersoll, A. P., Ewald, S. P., Sayanagi, K. M., & Blalock, J. J. (2018). Saturn's atmosphere at 1–10 kilometer resolution. Geophysical Research Letters, 45, 7851–7856. https://doi.org/10.1029/2018GL079255
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89757
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Sep 2018 21:37
Last Modified:20 Apr 2020 08:47

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