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contributor authorLim, Gyu Ho
contributor authorHolton, James R.
contributor authorWallace, John M.
date accessioned2017-06-09T14:30:28Z
date available2017-06-09T14:30:28Z
date copyright1991/08/01
date issued1991
identifier issn0022-4928
identifier otherams-20575.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156818
description abstractA high-pass filtered time series of the 500-mb height at a grid point in the Pacific storm track is regressed against the ageostrophic wind field at all grid points on the NMC grids for nine winters in order to determine the characteristic relationship between the ageostrophic wind and the geopotential distribution in baroclinic waves. The resulting ageostrophic wind pattern does not consist simply of a zonally oriented divergent circulation as sometimes pictured in theoretical models. Rather, it is dominated by the zonal component along the axis of the baroclinic waves at the 250-mb level, and the meridional component along the poleward and equatorward flanks of the waves at the 850-mb level. Diagnosis of the disturbance fields indicates that the finite meridional width of the baroclinic jet and its associated wave disturbances is the key factor in determining the distribution of the ageostrophic wind. It is shown that the ageostrophic flow based on a variable Coriolis parameter should not be used alone to estimate the divergent circulation since the divergence of the geostrophic wind is of the same order of magnitude and partly compensates the divergence of the ageostrophic wind at upper levels and augments it at lower levels.
publisherAmerican Meteorological Society
titleThe Structure of the Ageostrophic Wind Field in Baroclinic Waves
typeJournal Paper
journal volume48
journal issue15
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1991)048<1733:TSOTAW>2.0.CO;2
journal fristpage1733
journal lastpage1745
treeJournal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 015
contenttypeFulltext


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