Baroclinic Instability of Zonal Flows and Planetary Waves in Multi-Level Models on a Sphere.

Details Baroclinic Instability of Zonal Flows and Planetary Waves in Multi-Level Models on a Sphere. Baroclinic Instability of Zonal Flows and Planetary Waves in Multi-Level Models on a Sphere.

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jats...36.2320f&link_type=abstract

Journal of Atmospheric Sciences, vol. 36, Issue 12, pp.2320-2335

Computer Science

4

Scientific paper

A study is made of the changes in growth rates and phase speeds of growing baroclinic waves, disturbance streamfunctions and eddy momentum and heat fluxes induced by superimposing long planetary waves on purely zonal flow basic states in a five-level spherical quasi-geostrophic model. Attention is focused on basic states consisting of two 30° zonal jets with different vertical structures together with long zonal wavenumber 4 planetary waves having a number of different horizontal and vertical variations. In many respects, the qualitative changes in the properties of the fastest growing modes produced by the long planetary waves are similar to those found in two-layer models. In particular, the positions of the regions of preferential development of cyclones and anticyclones and the qualitative horizontal structures of the upper level non-oscillatory momentum fluxes bear a strong similarity to two-layer results with similar basic states. However, there are considerable differences in the vertical structures of disturbance streamfunctions and fluxes in two- and five-level models. The presence of the long planetary waves in the five-level model increases the upper level amplitudes of the disturbance streamfunctions and the upper level, poleward, zonally averaged momentum fluxes and thus improves comparison between these observed quantities and results of linear studies.

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