Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p33a0238z&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P33A-0238
Physics
0343 Planetary Atmospheres (5210, 5405, 5704), 1223 Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), 3319 General Circulation (1223), 3346 Planetary Meteorology (5445, 5739)
Scientific paper
This paper investigates the exchange of global mean angular momentum between an atmosphere and its underlying planet by a simple model. The model parameterizes four processes that are responsible for zonal mean momentum budget in the atmospheric boundary layer for a rotating planet: (i) meridional circulation that redistributes the relative angular momentum, (ii) horizontal diffusion that smoothes the prograde and retrograde winds, (iii) frictional drag that exchanges atmospheric angular momentum with the underlying planet and (iv) internal redistribution of the zonal mean momentum by wave drags. It is shown that under a steady state or a long-term average condition, the global relative angular momentum in the boundary layer vanishes unless there exists a preferred frictional drag for either the prograde or the retrograde zonal wind. We further show quantitatively that one cannot have either a predominant steady prograde or retrograde wind in a boundary layer of a planetary atmosphere. The parameter dependences of the global relative angular momentum and the strength of atmospheric circulation in the boundary layer are derived explicitly and used to explain the observational differences between the atmospheres of Earth and Venus.
Flasar Michael F.
Strobel Darrell F.
Zhu Xiyu
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