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Superrotation and equatorial waves in a T21 Venus‐like AGCM
Author(s) -
Yamamoto Masaru,
Takahashi Masaaki
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl016924
Subject(s) - venus , atmospheric sciences , angular momentum , geophysics , gravity wave , forcing (mathematics) , zonal and meridional , zonal flow (plasma) , atmospheric wave , wavenumber , momentum (technical analysis) , atmosphere of venus , gravitational wave , flux (metallurgy) , geology , climatology , physics , astrobiology , astronomy , classical mechanics , plasma , materials science , finance , quantum mechanics , metallurgy , optics , economics , tokamak
Superrotation of more than 100 m s −1 is formed at the cloud top (65–70 km) in a T21 Venus‐like atmospheric general circulation model (Venus‐like AGCM) driven by a zonal‐mean thermal forcing. This is maintained by the Gierasch mechanism, in which meridional circulation efficiently pumps up angular momentum and various waves produce equatorward eddy momentum fluxes. In addition to the above mechanism, fast equatorial waves with a wide frequency range (including a famous 4‐day wave) enhance the cloud‐top superrotation, since the downward angular momentum flux of vertically propagating gravity waves is canceled by the upward flux of the fast equatorial waves.