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Local Time Dependence of the Thermal Structure in the Venusian Equatorial Upper Atmosphere: Comparison of Akatsuki Radio Occultation Measurements and GCM Results
Author(s) -
Ando Hiroki,
Takagi Masahiro,
Fukuhara Tetsuya,
Imamura Takeshi,
Sugimoto Norihiko,
Sagawa Hideo,
Noguchi Katsuyuki,
Tellmann Silvia,
Pätzold Martin,
Häusler Bernd,
Murata Yasuhiro,
Takeuchi Hiroshi,
Yamazaki Atsushi,
Toda Tomoaki,
Tomiki Atsushi,
Choudhary Rajkumar,
Kumar Kishore,
Ramkumar Geetha,
Antonita Maria
Publication year - 2018
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
eISSN - 2169-9100
pISSN - 2169-9097
DOI - 10.1029/2018je005640
Subject(s) - radio occultation , atmosphere (unit) , venus , atmospheric sciences , troposphere , atmosphere of venus , geology , atmospheric wave , altitude (triangle) , wavenumber , gravity wave , geophysics , physics , wave propagation , ionosphere , meteorology , astrobiology , optics , geometry , mathematics
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.