Local Time Dependence of the Thermal Structure in the Venusian Equatorial Upper Atmosphere: Comparison of Akatsuki Radio Occultation Measurements and GCM Results

Hiroki Ando, Masahiro Takagi, Tetsuya Fukuhara, Takeshi Imamura, Norihiko Sugimoto, Hideo Sagawa, Katsuyuki Noguchi, Silvia Tellmann, Martin Pätzold, Bernd Häusler, Yasuhiro Murata, Hiroshi Takeuchi, Atsushi Yamazaki, Tomoaki Toda, Atsushi Tomiki, Rajkumar Choudhary, Kishore Kumar, Geetha Ramkumar, Maria Antonita

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5 Citations (Scopus)

Abstract

Temperature profiles of the Venus atmosphere obtained by the Akatsuki radio occultation measurements showed a prominent local time dependence above 65-km altitude at low latitudes equatorward of 35°. A zonal wavenumber 2 component is predominant in the temperature field, and its phase (i.e., isothermal) surfaces descend with local time, suggesting its downward phase propagation. A general circulation model (GCM) for the Venus atmosphere, AFES-Venus, reproduced the local time-dependent thermal structure qualitatively consistent with the radio occultation measurements. Based on a comparison between the radio occultation measurements and the GCM results, the observed zonal wavenumber 2 structure is attributed to the semidiurnal tide. Applying the dispersion relationship for internal gravity waves to the observed wave structure, the zonally averaged zonal wind speed at 75- to 85-km altitudes was found to be significantly smaller than that at the cloud top. The decrease of the zonal wind speed with altitude is attributed to the momentum deposition by the upwardly propagating semidiurnal tide excited in the cloud layer.

Original languageEnglish
Pages (from-to)2270-2280
Number of pages11
JournalJournal of Geophysical Research: Planets
Volume123
Issue number9
DOIs
Publication statusPublished - 2018 Sep 1

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Keywords

  • Akatsuki
  • GCM
  • radio occultation
  • thermal tide

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Ando, H., Takagi, M., Fukuhara, T., Imamura, T., Sugimoto, N., Sagawa, H., Noguchi, K., Tellmann, S., Pätzold, M., Häusler, B., Murata, Y., Takeuchi, H., Yamazaki, A., Toda, T., Tomiki, A., Choudhary, R., Kumar, K., Ramkumar, G., & Antonita, M. (2018). Local Time Dependence of the Thermal Structure in the Venusian Equatorial Upper Atmosphere: Comparison of Akatsuki Radio Occultation Measurements and GCM Results. Journal of Geophysical Research: Planets, 123(9), 2270-2280. https://doi.org/10.1029/2018JE005640