Nonlinear planetary wave instability and blocking

Details Nonlinear planetary wave instability and blocking Nonlinear planetary wave instability and blocking

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adats...9..173m&link_type=abstract

Advances in Atmospheric Sciences, Volume 9, Issue 2, pp.173-190

Physics

3

Scientific paper

The instability of geostrophic wave circulations related to the nonlinear processes involved in the zonal mean heat balance equations is studied. It is found that the planetary waves may be destabilized by thermal forcing in specific baroclinic layers, called the breaking layers. The critical conditions of the instability will be given. In the troposphere, these conditions may be provided in blocking regions and the development of planetary perturbations is characterized distinctly by the unset, maintenance and decay of observed blocks. The whole blocking episode cannot be described as either the barotropic or baroclinic process only. The limitations on the study of wave-wave interaction using spectral models or spectrum analyses will be discussed also.

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