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contributor authorAllen, D. R.
contributor authorStanford, J. L.
contributor authorElson, L. S.
contributor authorFishbein, E. F.
contributor authorFroidevaux, L.
contributor authorWaters, J. W.
date accessioned2017-06-09T14:34:19Z
date available2017-06-09T14:34:19Z
date copyright1997/02/01
date issued1997
identifier issn0022-4928
identifier otherams-21928.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158321
description abstractThe ?4-day wave? is an eastward moving quasi-nondispersive feature with period near 4 days occurring near the winter polar stratopause. This paper presents evidence of the 4-day feature in Microwave Limb Sounder (MLS) temperature, geopotential height, and ozone data from the late southern winters of 1992 and 1993. Space?time spectral analyses reveal a double-peaked temperature structure consisting of one peak near the stratopause and another in the lower mesosphere, with an out-of-phase relationship between the two peaks. This double-peaked structure is reminiscent of recent three-dimensional barotropic/baroclinic instability model predictions and is observed here for the first time. The height variation of the 4-day ozone signal is shown to compare well with a linear advective?photochemical tracer model. Negative regions of quasigeostrophic potential vorticity (PV) gradient and positive Eliassen?Palm flux divergence are shown to occur, consistent with instability dynamics playing a role in wave forcing. Spectral analyses of PV derived from MLS geopotential height fields reveal a 4-day signal peaking near the polar stratopause. The three-dimensional structure of the 4-day wave resembles the potential vorticity ?charge? concept, wherein a PV anomaly in the atmosphere (analogous to an electrical charge in a dielectric material) induces a geopotential field, a vertically oriented temperature dipole, and circulation about the vertical axis.
publisherAmerican Meteorological Society
titleThe 4-Day Wave as Observed from the Upper Atmosphere Research Satellite Microwave Limb Sounder
typeJournal Paper
journal volume54
journal issue3
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1997)054<0420:TDWAOF>2.0.CO;2
journal fristpage420
journal lastpage434
treeJournal of the Atmospheric Sciences:;1997:;Volume( 054 ):;issue: 003
contenttypeFulltext


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