The puzzling Venusian polar atmospheric structure reproduced by a general circulation model

Hiroki Ando, Norihiko Sugimoto, Masahiro Takagi, Hiroki Kashimura, Takeshi Imamura, Yoshihisa Matsuda

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Unlike the polar vortices observed in the Earth, Mars and Titan atmospheres, the observed Venus polar vortex is warmer than the midlatitudes at cloud-top levels (∼65 km). This warm polar vortex is zonally surrounded by a cold latitude band located at ∼60° latitude, which is a unique feature called 'cold collar' in the Venus atmosphere. Although these structures have been observed in numerous previous observations, the formation mechanism is still unknown. Here we perform numerical simulations of the Venus atmospheric circulation using a general circulation model, and succeed in reproducing these puzzling features in close agreement with the observations. The cold collar and warm polar region are attributed to the residual mean meridional circulation enhanced by the thermal tide. The present results strongly suggest that the thermal tide is crucial for the structure of the Venus upper polar atmosphere at and above cloud levels.

Original languageEnglish
Article number10398
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Feb 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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