Simulations of superrotation using a GCM for Venus' middle atmosphere

Masaru Yamamoto; Masaaki Takahashi

doi:10.1186/BF03352036

Simulations of superrotation using a GCM for Venus' middle atmosphere

Masaru Yamamoto, Masaaki Takahashi

Division of Earth Environment Dynamics

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A superrotation is simulated in a T10L100 general circulation model for Venus' middle atmosphere (VMAGCM), in which the radiative effects of aerosols are calculated. The simulation in a domain of 30-100 km is conducted under the condition of a bottom zonal flow with a velocity of 50 m s^-1 at the equator. Thermal tides contribute to the maintenance of the cloud-top superrotation together with meridional circulation and vertically propagating gravity waves. The meridional circulation and wave activity are sensitive to the vertical eddy diffusion. Although the equatorial zonal flow has a velocity of about 70 m s^-1 when the vertical eddy diffusion coefficient (K_V) is set at 5.0 m s^-2, it has a velocity of > 100 m s^-1 when K_V = 2.5 M s^-2. The fully developed equatorial jet for the small K_V case is enhanced at 65 km by small-scale gravity waves emitted from the cloud top.

Original language	English
Pages (from-to)	971-979
Number of pages	9
Journal	earth, planets and space
Volume	59
Issue number	8
DOIs	https://doi.org/10.1186/BF03352036
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Geology
Space and Planetary Science

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10.1186/BF03352036

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title = "Simulations of superrotation using a GCM for Venus' middle atmosphere",

abstract = "A superrotation is simulated in a T10L100 general circulation model for Venus' middle atmosphere (VMAGCM), in which the radiative effects of aerosols are calculated. The simulation in a domain of 30-100 km is conducted under the condition of a bottom zonal flow with a velocity of 50 m s-1 at the equator. Thermal tides contribute to the maintenance of the cloud-top superrotation together with meridional circulation and vertically propagating gravity waves. The meridional circulation and wave activity are sensitive to the vertical eddy diffusion. Although the equatorial zonal flow has a velocity of about 70 m s-1 when the vertical eddy diffusion coefficient (KV) is set at 5.0 m s-2, it has a velocity of > 100 m s-1 when KV = 2.5 M s-2. The fully developed equatorial jet for the small KV case is enhanced at 65 km by small-scale gravity waves emitted from the cloud top.",

author = "Masaru Yamamoto and Masaaki Takahashi",

note = "Funding Information: Acknowledgments. We would like to thank Dr. M. D. Yamanaka and an anonymous reviewer for helpful comments and suggestions. This study is supported by the Cooperative Research Project of the Center for Climate System Research, University of Tokyo, and by the JSPS Grant-in-Aid for Young Scientists (B) (No. 17740313). In this study, the results are partly obtained using the supercomputing resources at the Information Synergy Center, To-hoku University. The GFD-DENNOU library is used in drawing the figures.",

year = "2007",

doi = "10.1186/BF03352036",

language = "English",

volume = "59",

pages = "971--979",

journal = "Earth, Planets and Space",

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AU - Takahashi, Masaaki

N1 - Funding Information: Acknowledgments. We would like to thank Dr. M. D. Yamanaka and an anonymous reviewer for helpful comments and suggestions. This study is supported by the Cooperative Research Project of the Center for Climate System Research, University of Tokyo, and by the JSPS Grant-in-Aid for Young Scientists (B) (No. 17740313). In this study, the results are partly obtained using the supercomputing resources at the Information Synergy Center, To-hoku University. The GFD-DENNOU library is used in drawing the figures.

PY - 2007

Y1 - 2007

N2 - A superrotation is simulated in a T10L100 general circulation model for Venus' middle atmosphere (VMAGCM), in which the radiative effects of aerosols are calculated. The simulation in a domain of 30-100 km is conducted under the condition of a bottom zonal flow with a velocity of 50 m s-1 at the equator. Thermal tides contribute to the maintenance of the cloud-top superrotation together with meridional circulation and vertically propagating gravity waves. The meridional circulation and wave activity are sensitive to the vertical eddy diffusion. Although the equatorial zonal flow has a velocity of about 70 m s-1 when the vertical eddy diffusion coefficient (KV) is set at 5.0 m s-2, it has a velocity of > 100 m s-1 when KV = 2.5 M s-2. The fully developed equatorial jet for the small KV case is enhanced at 65 km by small-scale gravity waves emitted from the cloud top.

AB - A superrotation is simulated in a T10L100 general circulation model for Venus' middle atmosphere (VMAGCM), in which the radiative effects of aerosols are calculated. The simulation in a domain of 30-100 km is conducted under the condition of a bottom zonal flow with a velocity of 50 m s-1 at the equator. Thermal tides contribute to the maintenance of the cloud-top superrotation together with meridional circulation and vertically propagating gravity waves. The meridional circulation and wave activity are sensitive to the vertical eddy diffusion. Although the equatorial zonal flow has a velocity of about 70 m s-1 when the vertical eddy diffusion coefficient (KV) is set at 5.0 m s-2, it has a velocity of > 100 m s-1 when KV = 2.5 M s-2. The fully developed equatorial jet for the small KV case is enhanced at 65 km by small-scale gravity waves emitted from the cloud top.

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Simulations of superrotation using a GCM for Venus' middle atmosphere

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