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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Wave-Mean Flow Interactions and the Maintenance of Superrotation in a Terrestrial Atmosphere

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Dias Pinto, Joao Rafael ; Mitchell, Jonathan Lloyd
Total Authors: 2
Document type: Journal article
Source: JOURNAL OF THE ATMOSPHERIC SCIENCES; v. 73, n. 8, p. 3181-3196, AUG 2016.
Web of Science Citations: 4

The interplay between mean meridional circulation and transient eddies through wave-mean flow interaction processes defines the general behavior of any planetary atmospheric circulation. Under a higher-Rossby-number regime, equatorward momentum transports provided by large-scale disturbances generate a strong zonal flow at the equatorial region. At intermediate Rossby numbers, equatorial Kelvin waves play a leading role in maintaining a superrotating jet over the equator. However, at high Rossby numbers, the Kelvin wave only provides equatorward momentum fluxes during spinup, and the wave-mean flow process that maintains this strongly superrotating state has yet to be identified. This study presents a comprehensive analysis of the tridimensional structure and life cycle of atmospheric waves and their interaction with the mean flow, which maintains the strong, long-lived superrotating state in a higher-Rossby-number-regime atmosphere. The results show that the mean zonal superrotating circulation is maintained by the dynamical interaction between mixed baroclinic-barotropic Rossby wave modes via low-frequency variations of the zonal-mean state in short and sporadic periods of stronger instability. The modulation of amplitude of the equatorial and extratropical Rossby waves suggests a nonlinear mechanism of eddy-eddy interaction between these modes. (AU)

FAPESP's process: 12/13202-8 - Wave-mean flow interaction and atmospheric superrotation in terrestrial planets
Grantee:João Rafael Dias Pinto
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 10/15174-6 - General circulation and the atmospheric superotation of Titã
Grantee:João Rafael Dias Pinto
Support type: Scholarships in Brazil - Doctorate