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contributor authorDurran, Dale R.
date accessioned2017-06-09T14:33:32Z
date available2017-06-09T14:33:32Z
date copyright1995/11/01
date issued1995
identifier issn0022-4928
identifier otherams-21629.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157989
description abstractExpressions are derived for the local pseudomomentum density in two-dimensional compressible stratified flow and are compared with the expressions for pseudomomentum in two-dimensional Boussinesq and anelastic flow derived by Shepherd and by Scinocca and Shepherd. To facilitate this comparison, algebraically simpler expressions for the anelastic and Boussinesq pseudomomentum are also obtained. When the vertical wind shear in the reference-state flow is constant with height, the Boussinesq pseudomomentum is shown to reduce to a particularly simple form in which the pseudomomentum is proportional to the perturbation vorticity times the fluid-parcel displacement. The extension of these compressible pseudomomentum diagnostics to viscous flow and to three-dimensional flows with zero potential vorticity is also discussed. An expression is derived for the pseudomomentum flux in stratified compressible flow. This flux is shown to simultaneously satisfy the group-velocity condition for both sound waves and gravity waves in an isothermal atmosphere with a constant basic-state wind speed. Consistent with the earlier results of Andrews and McIntyre, it is shown that for inviscid flow over a topographic barrier, the pseudomomentum flux through the lower boundary is identical to the cross-mountain pressure drag?provided that the flow is steady and that the elevation of the topography returns to its upstream value on the downstream side of the mountain.
publisherAmerican Meteorological Society
titlePseudomomentum Diagnostics for Two-Dimensional Stratified Compressible Flow
typeJournal Paper
journal volume52
journal issue22
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1995)052<3997:PDFTDS>2.0.CO;2
journal fristpage3997
journal lastpage4009
treeJournal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 022
contenttypeFulltext


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