Planetary waves: Theory and observation

Details Planetary waves: Theory and observation Planetary waves: Theory and observation

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980wmo..rept...51d&link_type=abstract

In WMO Orographic Effects in Planetary Flows p 51-84 (SEE N80-33811 24-42)

Physics

Heat Transfer, Planetary Waves, Rossby Regimes, Air Land Interactions, Atmospheric Models, Baroclinity, Boundary Layer Transition, Fourier Analysis, Orography

Scientific paper

The dynamics of planetary waves and their observational characteristics are reviewed and the tropospheric sources of these waves are summarized. The characteristic structures to be expected for waves excited by different sources are explained by means of linear perturbation theory. It is shown that improved understanding of planetary waves in general will require improved understanding of the long-term monthly mean stationary waves in the troposphere. Between hemispheres, there are remarkable differences of the Fourier longitudinal wavenumber one and seasons that are poorly understood. The orographic and diabatic forcing terms for planetary waves are examined. It is pointed out that thermal infrared radiation is likely important for planetary wave structure. The response to orography of barotropic and continuously stratified planetary wave models is discussed. Besides exhibiting different dependences on wavenumber, the two models are very different in their sensitivity to Ekman friction.

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