Wave analysis in the atmosphere of Venus below 100-km altitude, simulated by the LMD Venus GCM

Sébastien Lebonnois, Norihiko Sugimoto, Gabriella Gilli

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

A new simulation of Venus atmospheric circulation obtained with the LMD Venus GCM is described and the simulated wave activity is analyzed. Agreement with observed features of the temperature structure, static stability and zonal wind field is good, such as the presence of a cold polar collar, diurnal and semi-diurnal tides. At the resolution used (96 longitudes × 96 latitudes), a fully developed superrotation is obtained both when the simulation is initialized from rest and from an atmosphere already in superrotation, though winds are still weak below the clouds (roughly half the observed values). The atmospheric waves play a crucial role in the angular momentum budget of the Venus's atmospheric circulation. In the upper cloud, the vertical angular momentum is transported by the diurnal and semi-diurnal tides. Above the cloud base (approximately 1 bar), equatorward transport of angular momentum is done by polar barotropic and mid- to high-latitude baroclinic waves present in the cloud region, with frequencies between 5 and 20 cycles per Venus day (periods between 6 and 23 Earth days). In the middle cloud, just above the convective layer, a Kelvin type wave (period around 7.3 Ed) is present at the equator, as well as a low-latitude Rossby-gravity type wave (period around 16 Ed). Below the clouds, large-scale mid- to high-latitude gravity waves develop and play a significant role in the angular momentum balance.

Original languageEnglish
Pages (from-to)38-51
Number of pages14
JournalIcarus
Volume278
DOIs
Publication statusPublished - 2016 Nov 1

Keywords

  • Atmospheres, dynamics
  • Experimental techniques
  • Image processing
  • Numerical modeling
  • Ultraviolet observations
  • Venus, atmosphere

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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