Evidence for Gravity Waves in the Thermosphere of Saturn and Implications for Global Circulation
AffiliationLunar and Planetary Laboratory, University of Arizona
MetadataShow full item record
PublisherJohn Wiley and Sons Inc
CitationBrown, Z. L., Medvedev, A. S., Starichenko, E. D., Koskinen, T. T., & Müller-Wodarg, I. C. F. (2022). Evidence for Gravity Waves in the Thermosphere of Saturn and Implications for Global Circulation. Geophysical Research Letters.
JournalGeophysical Research Letters
RightsCopyright © 2022. American Geophysical Union. All Rights Reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractGravity wave (GW) signatures have been derived from temperature profiles observed by Cassini/Ultraviolet Imaging Spectrograph in the Saturnian thermosphere during the Grand Finale campaign. They demonstrate upward propagation of GW packets, their saturation, and breaking. We determined wave amplitudes, potential energy, and momentum fluxes and estimated the associated wave drag imposed by dissipating harmonics on the ambient flow. The data set of 18 profiles covers the middle and high latitudes of both hemispheres, which allows for exploring the global impact of waves. The diagnostics based on the Transformed Eulerian Mean and modified geostrophy approach reveal that the GW drag induces an equatorward flow in both hemispheres, facilitating transport of heat away from the auroral zones and redistributing energy across latitudes. Like all the outer planets, Saturn's thermosphere is hundreds of degrees hotter than what follows from radiative balance and these results help to explain the observed temperatures at all latitudes. © 2022. American Geophysical Union. All Rights Reserved.
Note6 month embargo; first published: 11 April 2022
VersionFinal published version