Geophysical turbulence is strongly influenced by the variation of the Coriolis force with latitude (beta-effect): when this effect is significant an anisotropic inverse cascade is developed since energy is preferentially transferred towards zonal modes. The consequent emergence of flow structures along the zonal direction can strongly impact turbulent transport and modify meridional scalar diffusion. In this letter we investigate zonal and meridional diffusion in laboratory experiments of turbulence affected by a b-effect. The degree of anisotropy and the flow characteristic scales have been quantified according to a Lagrangian approach based on the reconstruction of tracer trajectories, i.e., in analogy with oceanic drifters data, and on the Finite-Scale Lyapunov Exponent (FSLE) analysis. An experimental confirmation of a recently introduced scaling law for the meridional diffusion in the marginally zonostrophic regime is also presented. Citation: Lacorata, G., and S. Espa (2012), On the influence of a b-effect on Lagrangian diffusion, Geophys. Res. Lett., 39, L11605, doi:10.1029/2012GL051841.

On the influence of a beta-effect on Lagrangian diffusion / G., Lacorata; Espa, Stefania. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - STAMPA. - 39:(2012), p. L11605. [10.1029/2012gl051841]

On the influence of a beta-effect on Lagrangian diffusion

ESPA, Stefania
2012

Abstract

Geophysical turbulence is strongly influenced by the variation of the Coriolis force with latitude (beta-effect): when this effect is significant an anisotropic inverse cascade is developed since energy is preferentially transferred towards zonal modes. The consequent emergence of flow structures along the zonal direction can strongly impact turbulent transport and modify meridional scalar diffusion. In this letter we investigate zonal and meridional diffusion in laboratory experiments of turbulence affected by a b-effect. The degree of anisotropy and the flow characteristic scales have been quantified according to a Lagrangian approach based on the reconstruction of tracer trajectories, i.e., in analogy with oceanic drifters data, and on the Finite-Scale Lyapunov Exponent (FSLE) analysis. An experimental confirmation of a recently introduced scaling law for the meridional diffusion in the marginally zonostrophic regime is also presented. Citation: Lacorata, G., and S. Espa (2012), On the influence of a b-effect on Lagrangian diffusion, Geophys. Res. Lett., 39, L11605, doi:10.1029/2012GL051841.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
On the influence of a beta-effect on Lagrangian diffusion / G., Lacorata; Espa, Stefania. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - STAMPA. - 39:(2012), p. L11605. [10.1029/2012gl051841]
File allegati a questo prodotto
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/476621
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 10
social impact