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Provedor de dados:  ArchiMer
País:  France
Título:  Vortex pairing in an unstable anticyclonic shear flow: discrete subharmonics of one pendulum day
Autores:  Flament, Pierre
Lumpkin, Rick
Tournadre, Jean
Armi, Laurence
Data:  2001-08
Ano:  2001
Palavras-chave:  Vortex
Oceanic shear flow
Resumo:  Observations of the downstream evolution of an oceanic zonal horizontal shear flow at a Reynolds number of about 10(11), formed as the westward North Equatorial Current passes the island of Hawai'i, reveal finite-amplitude anticyclonic vortices resulting from instability of the shear. The initial orbital period of the vortices is exactly one pendulum day (3.1 days at this latitude), centrifugal instability presumably inhibiting stronger vortices from forming. As they move downstream, they appear to pair and merge into successively larger vortices, in a geometric sequence of longer orbital periods; three subharmonic transitions are suggested with final orbital periods near 6, 12 and 24 days.
Tipo:  Text
Idioma:  Inglês

Editor:  Cambridge University Press
Formato:  application/pdf
Fonte:  Journal of Fluid Mechanics (0022-1120) (Cambridge University Press), 2001-08 , Vol. 440 , P. 401-409
Direitos:  2001 Cambridge University Press

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