Influences of Venus’ topography on fully developed superrotation and near-surface flow

Masaru Yamamoto, Masaaki Takahashi

Research output: Contribution to journalLetter

7 Citations (Scopus)

Abstract

We investigate the influence of topography on Venus’ atmospheric general circulation. Based on comparative simulations with and without the Venusian topography, we elucidate the role of the topography in the fully developed superrotation. Orographically forced stationary waves are predominant over Mt. Maxwell: slightly weakening the superrotation near the cloud top. Differently from previous GCM results, the orographically forced waves do not produce significant asymmetry between the northern and southern hemispheric superrotations in the present model. Weak surface flows from mountains to lowlands are caused by the pressure dependence of the Newtonian cooling. The pattern and magnitude of the near-surface flow are largely different from those simulated in the Herrnstein and Dowling (2007) model. This implies that the parameterizations of physical processes (such as Newtonian cooling, turbulence, diffusion, and surface drag) and the model resolution could significantly influence the pattern and magnitude of the near-surface flow and the orographical forcing of planetary-scale stationary waves.

Original languageEnglish
Pages (from-to)e45-e48
Journalearth, planets and space
Volume61
Issue number10
DOIs
Publication statusPublished - Oct 2009

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

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