Rossby Waves and Jets in Two-Dimensional Decaying Turbulence on a Rotating SphereSource: Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 012::page 4246Author:Hayashi, Yoshi-Yuki
,
Nishizawa, Seiya
,
Takehiro, Shin-ichi
,
Yamada, Michio
,
Ishioka, Keiichi
,
Yoden, Shigeo
DOI: 10.1175/2007JAS2209.1Publisher: American Meteorological Society
Abstract: Jet formation in decaying two-dimensional turbulence on a rotating sphere is reviewed from the viewpoint of Rossby waves. A series of calculations are performed to confirm the behavior of zonal mean flow generation on the parameter space of the rotation rate Ω and Froude number Fr. When the flow is nondivergent and Ω is large, intense easterly circumpolar jets tend to emerge in addition to the appearance of a banded structure of zonal mean flows with alternating flow directions. When the system allows surface elevation, circumpolar jets disappear and an equatorial easterly jet emerges with increasing Fr. The appearance of the intense easterly jets can be understood by the angular-momentum transport associated with the generation, propagation, and absorption of Rossby waves. When the flow is nondivergent, long Rossby waves tend to be absorbed near the poles. In contrast, when Fr is large, Rossby waves can hardly propagate poleward and tend to be absorbed near the equator.
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contributor author | Hayashi, Yoshi-Yuki | |
contributor author | Nishizawa, Seiya | |
contributor author | Takehiro, Shin-ichi | |
contributor author | Yamada, Michio | |
contributor author | Ishioka, Keiichi | |
contributor author | Yoden, Shigeo | |
date accessioned | 2017-06-09T16:18:31Z | |
date available | 2017-06-09T16:18:31Z | |
date copyright | 2007/12/01 | |
date issued | 2007 | |
identifier issn | 0022-4928 | |
identifier other | ams-65449.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4206675 | |
description abstract | Jet formation in decaying two-dimensional turbulence on a rotating sphere is reviewed from the viewpoint of Rossby waves. A series of calculations are performed to confirm the behavior of zonal mean flow generation on the parameter space of the rotation rate Ω and Froude number Fr. When the flow is nondivergent and Ω is large, intense easterly circumpolar jets tend to emerge in addition to the appearance of a banded structure of zonal mean flows with alternating flow directions. When the system allows surface elevation, circumpolar jets disappear and an equatorial easterly jet emerges with increasing Fr. The appearance of the intense easterly jets can be understood by the angular-momentum transport associated with the generation, propagation, and absorption of Rossby waves. When the flow is nondivergent, long Rossby waves tend to be absorbed near the poles. In contrast, when Fr is large, Rossby waves can hardly propagate poleward and tend to be absorbed near the equator. | |
publisher | American Meteorological Society | |
title | Rossby Waves and Jets in Two-Dimensional Decaying Turbulence on a Rotating Sphere | |
type | Journal Paper | |
journal volume | 64 | |
journal issue | 12 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/2007JAS2209.1 | |
journal fristpage | 4246 | |
journal lastpage | 4269 | |
tree | Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 012 | |
contenttype | Fulltext |