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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Dias Pinto, Joao Rafael ; Mitchell, Jonathan Lloyd
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF THE ATMOSPHERIC SCIENCES; v. 73, n. 8, p. 3181-3196, AUG 2016.
Citações Web of Science: 4
Resumo

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)

Processo FAPESP: 12/13202-8 - Interação onda-escoamento médio e superrotação atmosférica em planetas terrestres
Beneficiário:João Rafael Dias Pinto
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
Processo FAPESP: 10/15174-6 - Circulação geral e manutenção da superrotação da atmosfera de Titã
Beneficiário:João Rafael Dias Pinto
Linha de fomento: Bolsas no Brasil - Doutorado