TY - JOUR
T1 - Influences of Venus’ topography on fully developed superrotation and near-surface flow
AU - Yamamoto, Masaru
AU - Takahashi, Masaaki
N1 - Funding Information:
Acknowledgments. Magellan topography data of Ford and Pet-tengill were obtained from the geosciences node of NASA’s planetary data system. This study is supported by the cooperative research project of CCSR, Univ. Tokyo, and by the JSPS Grant-in-Aid for Young Scientists (B) (No. 17740313 and 20740273). Numerical experiments were conducted at the Information Technology Center of Univ. Tokyo and the Information Initiative Center of Hokkaido Univ. The GFD-DENNOU library is used for drawing figures.
Publisher Copyright:
© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS).
PY - 2009/10
Y1 - 2009/10
N2 - 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.
AB - 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.
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U2 - 10.1186/BF03352962
DO - 10.1186/BF03352962
M3 - Letter
AN - SCOPUS:85014177706
VL - 61
SP - e45-e48
JO - Earth, Planets and Space
JF - Earth, Planets and Space
SN - 1343-8832
IS - 10
ER -