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Atmospheric Science Across the Stratopause by David E. Siskind, Stephen D. Eckermann, Michael E. Summers

By David E. Siskind, Stephen D. Eckermann, Michael E. Summers

Published through the yank Geophysical Union as a part of the Geophysical Monograph Series.

lately, separate geophysical examine cultures have constructed within the usa to review the ambience: considered one of house scientists, who specialise in the mesosphere, thermosphere and ionosphere, and the opposite of atmospheric scientists, who specialize in the troposphere and stratosphere. The boundary among those learn domain names approximately coincides with the stratopause (50 km). whereas the department ofthe surroundings into layers and bounds serves as an invaluable option to signify many of the chemical and dynamical procedures that distinguish those layers, those obstacles aren't impermeable. to appreciate such serious concerns as worldwide switch, geophysicists needs to examine the ambience as an built-in method. the aim of this monograph is to focus on these stories that contemplate the coupling of those areas and hence compile clinical specialties (atmospheric technology and area technological know-how) which are usually thought of separately.Content:

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INTRODUCTION Viewed globally, the average circulation of the atmo­ sphere features mean winds that are primarily zonal; that is, they tend to blow roughly parallel to latitude circles. In the extratropical troposphere the zonal winds are eastward directed, with characteristic speeds in the range of 10-40 m s . In the middle atmosphere the direction reverses sea­ sonally; in winter the winds are eastward and in summer westward. Maximum speeds are of order 60-80 m s ^ in the upper stratosphere and lower mesosphere.

Haynes, P. , C. J. Marks, M. E. Mclntyre, T. G. Shepherd and K. P. Shine, On the "downward control" of extratropical diabatic circulations by eddy-induced mean zonal forces, J. Atmos. , 48, 651-678, 1991. Holton, J. , 1992. Holton, J. , P. H. Haynes, M. E. Mclntyre, A. R. Douglass, R. B. Rood and L. Pfister, Stratosphere-troposphere exchange, Reviews of Geophysics, 33, 403-439, 1995. Holton, J. R. and M. R. Schoeberl, The role of gravity wave generated advection and diffusion in the transport of tracers in the mesosphere, J.

Careful analysis of this situation reveals that meridional propagation can occur in the region of positive zonal flow (providing an equatorward flux of wave activity), but the waves must decay with distance from the critical line in the negative zonal flow region. Thus, there must be a substantial convergence of the flux of wave 0 k 26 THE ROLE OF WAVES IN THE TRANSPORT CIRCULATION OF THE MIDDLE ATMOSPHERE The momentum equation for the parcel oscillation is then which has the general solution 8s = exp[±i( N cos a)t\.

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