Abstract We investigate the characteristics of equatorial waves associated with maintenance superrotation in stratosphere a Titan general circulation model. A variety are present model atmosphere, including Kelvin waves, Rossby and mixed Rossby–gravity waves. In upper stratosphere, acceleration is strongest around solstice due to interaction between Rossby-type winter hemisphere midlatitudes. T...

Atmospheric superrotation with prograde equatorial winds and an equatorial angular momentum maximum is ubiquitous in planetary atmospheres. It is clear that eddy fluxes of angular momentum toward the equator are necessary to generate it. But under what conditions superrotation arises has remained unclear. This paper presents simulations and a scaling theory that establish conditions under which...

A Rossby–Haurwitz (RH) wave is an excitation mode of a fluid on rotating spherical surface, which propagates westward in the frame reference. Motivated by recent realization shell-shaped Bose–Einstein condensate microgravity, we investigate RH superfluid spherical-surface geometry. We employ point-vortex model and three-dimensional Gross–Pitaevskii equation, numerically demonstrate that waves c...

The equatorial atmospheric variability shows a spectrum of significant peaks in the wavenumber– frequency domain. These peaks have been identified with the equatorially trapped wave modes of rotating shallow water wave theory. This paper addresses the observation that the various wave types (e.g., Kelvin, Rossby, etc.) and wavenumbers show differing signal strength relative to a red background....

The surface quasi-geostrophic (SQG) equations are a model for low-Rossby number geophysical flows in which the dynamics are governed by potential temperature dynamics on the boundary. The model can be used to explore the effect on transport of the transition from two-dimensional to three-dimensional mesoscale geophysical flows. On an f -plane with linear stratification, we examine the dynamics ...

[1] Using the 1.5-layer long Rossby wave model forced by the seasonal European Remote Sensing (ERS) satellite scatterometer wind, we demonstrate that the seasonal variability of the South Equatorial Countercurrent (SECC) is due to the interplay of two types of forced Rossby waves: the resonantly forced Rossby waves north of 10 S and the locally forced Rossby waves south of 10 S. The resonantly ...