On the Large-Scale Dynamics of f-Plane Zonally Symmetric Circulations
Journal Article - Open Access
Indiana University Bloomington United States
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In this study, an f-plane dynamical model for incompressible flows is presented to examine the mechanisms underlying thestructure and stability of large-scale zonally symmetric circulations. Analyses based on the Principle of Exchange of Stabilitiesreveal that this zonally symmetric model possesses a single-cell structure in the absence of the Coriolis force, similar to thesingle-cell general atmospheric circulation in the absence of the Earths rotation as previously hypothesized. The circulation,however, bifurcates into a triple-cell structure in the presence of the Coriolis force if the vertical temperature gradient, therotational rate, and the momentum eddy coefficients satisfy a certain constraint. Further analyses of this triple-cell structure asa result of the Coriolis force show that this structure is topologically stable, thus offering new insight into the highly resilientstructure of the Earths atmospheric global circulations.
- Atmospheric Physics